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1 -Revision History
1 +{{box title="**Содержание**"}}
2 +{{toc/}}
3 +{{/box}}
2 2  
3 -|**Revision**|**Date**|**Contents**
4 -| |April 2011|Initial release
5 -|1.0|April 2013|Added section 9 - Transforming between versions of SDMX
6 -|2.0|July 2020|Added section 10 – Validation and Transformation Language – before the Annex 1.
5 +**Revision History**
7 7  
7 +(% style="width:954.835px" %)
8 +|(% style="width:106px" %)**Revision**|(% style="width:124px" %)**Date**|(% style="width:723px" %)**Contents**
9 +|(% style="width:106px" %) |(% style="width:124px" %)April 2011|(% style="width:723px" %)Initial release
10 +|(% style="width:106px" %)1.0|(% style="width:124px" %)April 2013|(% style="width:723px" %)Added section 9 - Transforming between versions of SDMX
11 +|(% style="width:106px" %)2.0|(% style="width:124px" %)July 2020|(% style="width:723px" %)Added section 10 – Validation and Transformation Language – before the Annex 1.
12 +
8 8  = 1 Purpose and Structure =
9 9  
10 10  == 1.1 Purpose ==
11 11  
12 -The intention of this document is to document certain aspects of SDMX that are important to understand and will aid implementation decisions. The explanations here supplement the information documented in the SDMX XML schema and the
17 +The intention of this document is to document certain aspects of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] that are important to understand and will aid implementation decisions. The explanations here supplement the information documented in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] XML schema and the Information Model.
13 13  
14 -Information Model.
15 -
16 16  == 1.2 Structure ==
17 17  
18 18  This document is organized into the following major parts:
19 19  
20 -A guide to the SDMX Information Model relating to Data Structure Definitions and Data Sets, statement of differences in functionality supported by the different formats and syntaxes for Data Structure Definitions and Data Sets, and best practices for use of SDMX formats, including the representation for time period
23 +A guide to the [[SDMX Information Model>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] relating to [[Data Structure Definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] and [[Data Sets>>doc:sdmx:Glossary.Data set.WebHome]], statement of differences in functionality supported by the different formats and syntaxes for [[Data Structure Definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] and [[Data Sets>>doc:sdmx:Glossary.Data set.WebHome]], and best practices for use of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] formats, including the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] for time period.
21 21  
22 -A guide to the SDMX Information Model relating to Metadata Structure Definitions, and Metadata Sets
25 +A guide to the [[SDMX Information Model>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] relating to [[Metadata Structure Definitions>>doc:sdmx:Glossary.Metadata structure definition.WebHome]], and Metadata Sets
23 23  
24 -Other structural artefacts of interest: agencies, concept role. constraint, partial code list
27 +Other structural [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] of interest: agencies, (% style="color:#e74c3c" %)concept(%%) role. (% style="color:#e74c3c" %)constraint(%%), partial [[code list>>doc:sdmx:Glossary.Code list.WebHome]]
25 25  
26 26  = 2 General Notes on This Document =
27 27  
28 -At this version of the standards, the term “Key family” is replaced by Data Structure Definition (also known and referred to as DSD) both in the XML schemas and the Information Model. The term “Key family” is not familiar to many people and its name was taken from the model of SDMX-EDI (previously known as GESMES/TS). The more familiar name “Data Structure Definition” which was used in many documents is now also the technical artefact in the SDMX-ML and Information Model technical specifications. The term “Key family” is still used in the SDMX-EDI specification.
31 +At this (% style="color:#e74c3c" %)version(%%) of the standards, the term “Key family” is replaced by [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] (also known and referred to as [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]) both in the XML schemas and the Information Model. The term “Key family” is not familiar to many people and its name was taken from the model of [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] (previously known as GESMES/TS). The more familiar name “[[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]” which was used in many documents is now also the technical [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] in the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] and Information Model technical specifications. The term “Key family” is still used in the [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] specification.
29 29  
30 -There has been much work within the SDMX community on the creation of user guides, tutorials, and other aides to implementation and understanding of the standard. This document is not intended to duplicate the function of these documents, but instead represents a short set of technical notes not generally covered elsewhere.
33 +There has been much work within the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] community on the creation of user guides, tutorials, and other aides to implementation and understanding of the standard. This document is not intended to duplicate the function of these documents, but instead represents a short set of technical notes not generally covered elsewhere.
31 31  
32 32  = 3 Guide for SDMX Format Standards =
33 33  
34 34  == 3.1 Introduction ==
35 35  
36 -This guide exists to provide information to implementers of the SDMX format standards – SDMX-ML and SDMX-EDI – that are concerned with data, i.e. Data Structure Definitions and Data Sets. This section is intended to provide information which will help users of SDMX understand and implement the standards. It is not normative, and it does not provide any rules for the use of the standards, such as those found in //SDMX-ML: Schema and Documentation// and //SDMX-EDI: Syntax and Documentation//.
39 +This guide exists to provide information to implementers of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] format standards – [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] and [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] – that are concerned with data, i.e. [[Data Structure Definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] and [[Data Sets>>doc:sdmx:Glossary.Data set.WebHome]]. This section is intended to provide information which will help users of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] understand and implement the standards. It is not normative, and it does not provide any rules for the use of the standards, such as those found in //[[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]]: Schema and Documentation// and //[[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]]: Syntax and Documentation//.
37 37  
38 38  == 3.2 SDMX Information Model for Format Implementers ==
39 39  
40 -=== 3.2.1 Introduction ===
43 +=== 3.2.1 Introduction ===
41 41  
42 -The purpose of this sub-section is to provide an introduction to the SDMX-IM relating to Data Structure Definitions and Data Sets for those whose primary interest is in the use of the XML or EDI formats.  For those wishing to have a deeper understanding of the Information Model, the full SDMX-IM document, and other sections in this guide provide a more in-depth view, along with UML diagrams and supporting explanation. For those who are unfamiliar with DSDs, an appendix to the SDMX-IM provides a tutorial which may serve as a useful introduction.
45 +The purpose of this sub-section is to provide an introduction to the [[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] relating to [[Data Structure Definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] and [[Data Sets>>doc:sdmx:Glossary.Data set.WebHome]] for those whose primary interest is in the use of the XML or EDI formats. For those wishing to have a deeper understanding of the Information Model, the full [[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] document, and other sections in this guide provide a more in-depth view, along with UML diagrams and supporting explanation. For those who are unfamiliar with DSDs, an appendix to the [[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] provides a tutorial which may serve as a useful introduction.
43 43  
44 -The SDMX-IM is used to describe the basic data and metadata structures used in all of the SDMX data formats. The Information Model concerns itself with statistical data and its structural metadata, and that is what is described here. Both structural metadata and data have some additional metadata in common, related to their management and administration. These aspects of the data model are not addressed in this section and covered elsewhere in this guide or in the full SDMX-IM document.
47 +The [[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] is used to describe the basic data and metadata structures used in all of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data formats. The Information Model concerns itself with statistical data and its [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]], and that is what is described here. Both [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]] and data have some additional metadata in common, related to their management and administration. These aspects of the data model are not addressed in this section and covered elsewhere in this guide or in the full [[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] document.
45 45  
46 -The Data Structure Definition and Data Set parts of the information model are consistent with the GESMES/TS version 3.0 Data Model (called SDMX-EDI in the SDMX standard), with these exceptions:
49 +The [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] and [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] parts of the information model are consistent with the GESMES/TS (% style="color:#e74c3c" %)version(%%) 3.0 Data Model (called [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] standard), with these exceptions:
47 47  
48 -the “sibling group” construct has been generalized to permit any dimension or dimensions to be wildcarded, and not just frequency, as in GESMES/TS. It has been renamed a “group” to distinguish it from the “sibling group” where only frequency is wildcarded. The set of allowable partial “group” keys must be declared in the DSD, and attributes may be attached to any of these group keys;
51 +* the “[[sibling group>>doc:sdmx:Glossary.Sibling group.WebHome]]” construct has been generalized to permit any [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] or [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] to be wildcarded, and not just frequency, as in GESMES/TS. It has been renamed a “group” to distinguish it from the “[[sibling group>>doc:sdmx:Glossary.Sibling group.WebHome]]” where only frequency is wildcarded. The set of allowable partial “group” keys must be declared in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]], and [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] may be attached to any of these [[group keys>>doc:sdmx:Glossary.Group key.WebHome]];
52 +* furthermore, whilst the “group” has been retained for compatibility with (% style="color:#e74c3c" %)version(%%) 2.0 and with [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]], it has, at (% style="color:#e74c3c" %)version(%%) 2.1, been replaced by the “[[Attribute Relationship>>doc:sdmx:Glossary.Attribute relationship.WebHome]]” definition which is explained later
53 +* the section on data [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is now a convention, to support interoperability with EDIFACT-syntax implementations ( see section 3.3.2);
49 49  
50 -furthermore, whilst the “group” has been retained for compatibility with version 2.0 and with SDMX-EDI, it has, at version 2.1, been replaced by the “Attribute Relationship” definition which is explained later
55 +[[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]-specific data formats are derived from the model, and some supporting features for declaring multiple [[measures>>doc:sdmx:Glossary.Measure.WebHome]] have been added to the [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]] descriptions Clearly, this is not a coincidence. The GESMES/TS Data Model provides the foundation for the EDIFACT messages in [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]], and also is the starting point for the development of [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]].
51 51  
52 -the section on data representation is now a convention, to support interoperability with EDIFACT-syntax implementations ( see section 3.3.2);
57 +Note that in the descriptions below, text in courier and italicised are the names used in the information model (e.g. //[[DataSet>>doc:sdmx:Glossary.Data set.WebHome]]//).
53 53  
54 -DSD-specific data formats are derived from the model, and some supporting features for declaring multiple measures have been added to the structural metadata descriptions
55 -
56 -Clearly, this is not a coincidence. The GESMES/TS Data Model provides the foundation for the EDIFACT messages in SDMX-EDI, and also is the starting point for the development of SDMX-ML.
57 -
58 -Note that in the descriptions below, text in courier and italicised are the names used in the information model (e.g. //DataSet//).
59 -
60 60  == 3.3 SDMX-ML and SDMX-EDI: Comparison of Expressive Capabilities and Function ==
61 61  
62 -SDMX offers several equivalent formats for describing data and structural metadata, optimized for use in different applications. Although all of these formats are derived directly from the SDM-IM, and are thus equivalent, the syntaxes used to express the model place some restrictions on their use. Also, different optimizations provide different capabilities. This section describes these differences, and provides some rules for applications which may need to support more than one SDMX format or syntax. This section is constrained to the Data Structure Definitionand the Date Set.
61 +[[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] offers several equivalent formats for describing data and [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]], optimized for use in different applications. Although all of these formats are derived directly from the SDM-IM, and are thus equivalent, the syntaxes used to express the model place some restrictions on their use. Also, different optimizations provide different capabilities. This section describes these differences, and provides some rules for applications which may need to support more than one [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] format or syntax. This section is constrained to the Data Structure Definitionand the Date Set.
63 63  
64 -=== 3.3.1 Format Optimizations and Differences ===
63 +=== 3.3.1 Format Optimizations and Differences ===
65 65  
66 -The following section provides a brief overview of the differences between the various SDMX formats.
65 +The following section provides a brief overview of the differences between the various [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] formats.
67 67  
68 -Version 2.0 was characterised by 4 data messages, each with a distinct format: Generic, Compact, Cross-Sectional and Utility. Because of the design, data in some formats could not always be related to another format. In version 2.1, this issue has been addressed by merging some formats and eliminating others. As a result, in
67 +(% style="color:#e74c3c" %)Version(%%) 2.0 was characterised by 4 data messages, each with a distinct format: Generic, Compact, Cross-Sectional and Utility. Because of the design, data in some formats could not always be related to another format. In (% style="color:#e74c3c" %)version(%%) 2.1, this issue has been addressed by merging some formats and eliminating others. As a result, in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 there are just two types of data formats: //GenericData// and //StructureSpecificData// (i.e. specific to one [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]).
69 69  
70 -SDMX 2.1 there are just two types of data formats: //GenericData// and
69 +Both of these formats are now flexible enough to allow for data to be oriented in series with any [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] used to disambiguate the observations (as opposed to only time or a cross sectional [[measure>>doc:sdmx:Glossary.Measure.WebHome]] in (% style="color:#e74c3c" %)version(%%) 2.0). The formats have also been expanded to allow for ungrouped observations.
71 71  
72 -//StructureSpecificData// (i.e. specific to one Data Structure Definition).
71 +To allow for applications which only understand time series data, variations of these formats have been introduced in the form of two data messages; //GenericTimeSeriesData// and //StructureSpecificTimeSeriesData//. It is important to note that these variations are built on the same root structure and can be processed in the same manner as the base format so that they do NOT introduce additional processing requirements.
73 73  
74 -Both of these formats are now flexible enough to allow for data to be oriented in series with any dimension used to disambiguate the observations (as opposed to only time or a cross sectional measure in version 2.0). The formats have also been expanded to allow for ungrouped observations.
73 +**//Structure Definition//**
75 75  
76 -To allow for applications which only understand time series data, variations of these formats have been introduced in the form of two data messages;
75 +The [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] Structure Message supports the use of [[annotations>>doc:sdmx:Glossary.Annotation.WebHome]] to the structure, which is not supported by the [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] syntax.
77 77  
78 -//GenericTimeSeriesData// and //StructureSpecificTimeSeriesData//. It is important to note that these variations are built on the same root structure and can be processed in the same manner as the base format so that they do NOT introduce additional processing requirements.
77 +The [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] Structure Message allows for the structures on which a [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] depends – that is, codelists and (% style="color:#e74c3c" %)concepts(%%) – to be either included in the message or to be referenced by the message containing the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]. XML syntax is designed to leverage URIs and other Internet-based referencing mechanisms, and these are used in the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] message. This option is not available to those using the [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] structure message.
79 79  
80 -=== //Structure Definition// ===
79 +**//Validation//**
81 81  
82 -The SDMX-ML Structure Message supports the use of annotations to the structure, which is not supported by the SDMX-EDI syntax.
81 +[[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] – as is typical of EDIFACT syntax messages – leaves validation to dedicated applications (“validation” being the checking of syntax, data typing, and adherence of the data message to the structure as described in the structural definition.)
83 83  
84 -The SDMX-ML Structure Message allows for the structures on which a Data Structure Definition depends – that is, codelists and concepts – to be either included in the message or to be referenced by the message containing the data structure definition. XML syntax is designed to leverage URIs and other Internet-based referencing mechanisms, and these are used in the SDMX-ML message. This option is not available to those using the SDMX-EDI structure message.
83 +The [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] Generic Data Message also leaves validation above the XML syntax (% style="color:#e74c3c" %)level(%%) to the application.
85 85  
86 -=== //Validation// ===
85 +The [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]-specific messages will allow validation of XML syntax and datatyping to be performed with a generic XML parser, and enforce agreement between the structural definition and the data to a moderate degree with the same tool.
87 87  
88 -SDMX-EDI – as is typical of EDIFACT syntax messages – leaves validation to dedicated applications (“validation” being the checking of syntax, data typing, and adherence of the data message to the structure as described in the structural
87 +//Update and Delete Messages and Documentation Messages//
89 89  
90 -definition.)
89 +All [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data messages allow for both delete messages and messages consisting of only data or only documentation.
91 91  
92 -The SDMX-ML Generic Data Message also leaves validation above the XML syntax level to the application.
91 +**//Character Encodings//**
93 93  
94 -The SDMX-ML DSD-specific messages will allow validation of XML syntax and datatyping to be performed with a generic XML parser, and enforce agreement between the structural definition and the data to a moderate degree with the same tool.
93 +All [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] messages use the UTF-8 encoding, while [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] uses the ISO 8879-1 character encoding. There is a greater capacity with UTF-8 to express some character sets (see the “APPENDIX: (% style="color:#e74c3c" %)MAP(%%) OF ISO 8859-1 (UNOC) CHARACTER SET (LATIN 1 OR “WESTERN”) in the document “SYNTAX AND DOCUMENTATION (% style="color:#e74c3c" %)VERSION(%%) 2.0”.) Many transformation tools are available which allow XML instances with UTF-8 encodings to be expressed as ISO 8879-1-encoded characters, and to transform UTF-8 into ISO 8879-1. Such tools should be used when transforming [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] messages into [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] messages and vice-versa.
95 95  
96 -=== //Update and Delete Messages and Documentation Messages// ===
95 +**//Data Typing//**
97 97  
98 -All SDMX data messages allow for both delete messages and messages consisting of only data or only documentation.
97 +The XML syntax and EDIFACT syntax have different data-typing mechanisms. The section below provides a set of conventions to be observed when support for messages in both syntaxes is required. For more information on the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] [[representations>>doc:sdmx:Glossary.Representation.WebHome]] of data, see below.
99 99  
100 -=== //Character Encodings// ===
99 +=== 3.3.2 Data Types ===
101 101  
102 -All SDMX-ML messages use the UTF-8 encoding, while SDMX-EDI uses the ISO 8879-1 character encoding. There is a greater capacity with UTF-8 to express some character sets (see the “APPENDIX: MAP OF ISO 8859-1 (UNOC) CHARACTER
101 +The XML syntax has a very different mechanism for data-typing than the EDIFACT syntax, and this difference may create some difficulties for applications which support both EDIFACT-based and XML-based [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data formats. This section provides a set of conventions for the expression in data in all formats, to allow for clean interoperability between them.
103 103  
104 -SET (LATIN 1 OR “WESTERN”) in the document “SYNTAX AND
103 +It should be noted that this section does not address character encodings – it is assumed that conversion software will include the use of transformations which will (% style="color:#e74c3c" %)map(%%) between the ISO 8879-1 encoding of the [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] format and the UTF-8 encoding of the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] formats.
105 105  
106 -DOCUMENTATION VERSION 2.0”.) Many transformation tools are available which allow XML instances with UTF-8 encodings to be expressed as ISO 8879-1-encoded characters, and to transform UTF-8 into ISO 8879-1. Such tools should be used when transforming SDMX-ML messages into SDMX-EDI messages and vice-versa.
105 +Note that the following conventions may be followed for ease of interoperation between EDIFACT and XML [[representations>>doc:sdmx:Glossary.Representation.WebHome]] of the data and metadata. For implementations in which no transformation between EDIFACT and XML syntaxes is foreseen, the restrictions below need not apply.
107 107  
108 -=== //Data Typing// ===
109 -
110 -The XML syntax and EDIFACT syntax have different data-typing mechanisms. The section below provides a set of conventions to be observed when support for messages in both syntaxes is required. For more information on the SDMX-ML representations of data, see below.
111 -
112 -==== 3.3.2 Data Types ====
113 -
114 -The XML syntax has a very different mechanism for data-typing than the EDIFACT syntax, and this difference may create some difficulties for applications which support both EDIFACT-based and XML-based SDMX data formats. This section provides a set of conventions for the expression in data in all formats, to allow for clean interoperability between them.
115 -
116 -It should be noted that this section does not address character encodings – it is assumed that conversion software will include the use of transformations which will map between the ISO 8879-1 encoding of the SDMX-EDI format and the UTF-8 encoding of the SDMX-ML formats.
117 -
118 -Note that the following conventions may be followed for ease of interoperation between EDIFACT and XML representations of the data and metadata. For implementations in which no transformation between EDIFACT and XML syntaxes is foreseen, the restrictions below need not apply.
119 -
120 120  1. **Identifiers** are:
121 121  1*. Maximum 18 characters;
122 122  1*. Any of A..Z (upper case alphabetic), 0..9 (numeric), _ (underscore);
... ... @@ -125,220 +125,220 @@
125 125  1*. Maximum 70 characters.
126 126  1*. From ISO 8859-1 character set (including accented characters)
127 127  1. **Descriptions **are:
128 -1*. Maximum 350 characters;  From ISO 8859-1 character set.
115 +1*. Maximum 350 characters;
116 +1*. From ISO 8859-1 character set.
129 129  1. **Code values** are:
130 130  1*. Maximum 18 characters;
131 131  1*. Any of A..Z (upper case alphabetic), 0..9 (numeric), _ (underscore), / (solidus, slash), = (equal sign), - (hyphen);
132 132  
133 -However, code values providing values to a dimension must use only the following characters:
121 +However, [[code>>doc:sdmx:Glossary.Code.WebHome]] values providing values to a [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] must use only the following characters:
134 134  
135 135  A..Z (upper case alphabetic), 0..9 (numeric), _ (underscore)
136 136  
137 -1. **Observation values** are:
138 -1*. Decimal numerics (signed only if they are negative);
139 -1*. The maximum number of significant figures is:
140 -1*. 15 for a positive number
141 -1*. 14 for a positive decimal or a negative integer
142 -1*. 13 for a negative decimal
143 -1*. Scientific notation may be used.
144 -1. **Uncoded statistical concept** text values are:
145 -1*.
146 -1**. Maximum 1050 characters;
147 -1**. From ISO 8859-1 character set.
148 -1. **Time series keys**:
125 +**5. Observation values** are:
149 149  
150 -In principle, the maximum permissible length of time series keys used in a data exchange does not need to be restricted. However, for working purposes, an effort is made to limit the maximum length to 35 characters; in this length, also (for SDMXEDI) one (separator) position is included between all successive dimension values; this means that the maximum length allowed for a pure series key (concatenation of dimension values) can be less than 35 characters.  The separator character is a colon (“:”) by conventional usage.
127 +* [[Decimal>>doc:sdmx:Glossary.Decimals.WebHome]] numerics (signed only if they are negative);
128 +* The maximum number of significant figures is:
129 +* 15 for a positive number
130 +* 14 for a positive [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] or a negative integer
131 +* 13 for a negative [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]]
132 +* Scientific notation may be used.
151 151  
134 +**6. Uncoded statistical concept** text values are:
135 +
136 +* Maximum 1050 characters;
137 +* From ISO 8859-1 character set.
138 +
139 +**7. Time series keys**:
140 +
141 +In principle, the maximum permissible length of time [[series keys>>doc:sdmx:Glossary.Series key.WebHome]] used in a data exchange does not need to be restricted. However, for working purposes, an effort is made to limit the maximum length to 35 characters; in this length, also (for SDMXEDI) one (separator) position is included between all successive [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] values; this means that the maximum length allowed for a pure [[series key>>doc:sdmx:Glossary.Series key.WebHome]] (concatenation of [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] values) can be less than 35 characters. The separator character is a colon (“:”) by conventional usage.
142 +
152 152  == 3.4 SDMX-ML and SDMX-EDI Best Practices ==
153 153  
154 -=== 3.4.1 Reporting and Dissemination Guidelines ===
145 +=== 3.4.1 Reporting and Dissemination Guidelines ===
155 155  
156 -**3.4.1.1 Central Institutions and Their Role in Statistical Data Exchanges **Central institutions are the organisations to which other partner institutions "report" statistics. These statistics are used by central institutions either to compile aggregates and/or they are put together and made available in a uniform manner (e.g. on-line or on a CD-ROM or through file transfers). Therefore, central institutions receive data from other institutions and, usually, they also "disseminate" data to individual and/or institutions for end-use.  Within a country, a NSI or a national central bank (NCB) plays, of course, a central institution role as it collects data from other entities and it disseminates statistical information to end users. In SDMX the role of central institution is very important: every statistical message is based on underlying structural definitions (statistical concepts, code lists, DSDs) which have been devised by a particular agency, usually a central institution. Such an institution plays the role of the reference "structural definitions maintenance agency" for the corresponding messages which are exchanged. Of course, two institutions could exchange data using/referring to structural information devised by a third institution.
147 +==== 3.4.1.1 Central Institutions and Their Role in Statistical Data Exchanges ====
157 157  
149 +Central institutions are the organisations to which other partner institutions "report" statistics. These statistics are used by central institutions either to compile aggregates and/or they are put together and made available in a uniform manner (e.g. on-line or on a CD-ROM or through file transfers). Therefore, central institutions receive data from other institutions and, usually, they also "disseminate" data to individual and/or institutions for end-use. Within a country, a NSI or a national central bank (NCB) plays, of course, a central institution role as it collects data from other entities and it disseminates statistical information to end users. In [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] the role of central institution is very important: every statistical message is based on underlying structural definitions (statistical (% style="color:#e74c3c" %)concepts(%%), [[code lists>>doc:sdmx:Glossary.Code list.WebHome]], DSDs) which have been devised by a particular agency, usually a central institution. Such an institution plays the role of the reference "structural definitions [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]] for the corresponding messages which are exchanged. Of course, two institutions could exchange data using/referring to structural information devised by a third institution.
150 +
158 158  Central institutions can play a double role:
159 159  
160 160  * collecting and further disseminating statistics;
161 161  * devising structural definitions for use in data exchanges.
162 162  
163 -**3.4.1.2 Defining Data Structure Definitions (DSDs)**
156 +==== 3.4.1.2 Defining Data Structure Definitions (DSDs) ====
164 164  
165 -The following guidelines are suggested for building a DSD. However, it is expected that these guidelines will be considered by central institutions when devising new DSDs.
158 +The following guidelines are suggested for building a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]. However, it is expected that these guidelines will be considered by central institutions when devising new DSDs.
166 166  
167 -=== Dimensions, Attributes and Code Lists ===
160 +(% class="wikigeneratedid" id="HDimensions2CAttributesandCodeLists" %)
161 +__Dimensions, Attributes and Code Lists__
168 168  
169 -**//Avoid dimensions that are not appropriate for all the series in the data structure definition.//**  If some dimensions are not applicable (this is evident from the need to have a code in a code list which is marked as “not applicable”, “not relevant” or “total”) for some series then consider moving these series to a new data structure definition in which these dimensions are dropped from the key structure. This is a judgement call as it is sometimes difficult to achieve this without increasing considerably the number of DSDs.
163 +**//Avoid [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] that are not appropriate for all the series in the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]].//** If some [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] are not applicable (this is evident from the need to have a [[code>>doc:sdmx:Glossary.Code.WebHome]] in a [[code list>>doc:sdmx:Glossary.Code list.WebHome]] which is marked as “not applicable”, “not relevant” or “total”) for some series then consider moving these series to a new [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] in which these [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] are dropped from the key structure. This is a judgement call as it is sometimes difficult to achieve this without increasing considerably the number of DSDs.
170 170  
171 -**//Devise DSDs with a small number of Dimensions for public viewing of data.//** A DSD with the number dimensions in excess 6 or 7 is often difficult for non specialist users to understand. In these cases it is better to have a larger number of DSDs with smaller “cubes” of data, or to eliminate dimensions and aggregate the data at a higher level. Dissemination of data on the web is a growing use case for the SDMX standards: the differentiation of observations by dimensionality which are necessary for statisticians and economists are often obscure to public consumers who may not always understand the semantic of the differentiation.
165 +**//Devise DSDs with a small number of [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] for public viewing of data.//** A [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] with the number [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] in excess 6 or 7 is often difficult for non specialist users to understand. In these cases it is better to have a larger number of DSDs with smaller “cubes” of data, or to eliminate [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] and aggregate the data at a higher (% style="color:#e74c3c" %)level(%%). Dissemination of data on the web is a growing use case for the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] standards: the differentiation of observations by dimensionality which are necessary for statisticians and economists are often obscure to public consumers who may not always understand the semantic of the differentiation.
172 172  
173 -**//Avoid composite dimensions.//**  Each dimension should correspond to a single characteristic of the data, not to a combination of characteristics.
167 +**//Avoid composite [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]].//** Each [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] should correspond to a single characteristic of the data, not to a combination of characteristics.
174 174  
175 -**//Consider the inclusion of the following attributes//**. Once the key structure of a data structure definition has been decided, then the set of (preferably mandatory) attributes  of this data structure definition has to be defined. In general, some statistical concepts are deemed necessary across all Data Structure Definitions to qualify the contained information. Examples of these are:
169 +**//Consider the inclusion of the following [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]//**. Once the key structure of a [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] has been decided, then the set of (preferably mandatory) [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] of this [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] has to be defined. In general, some statistical (% style="color:#e74c3c" %)concepts(%%) are deemed necessary across all [[Data Structure Definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] to qualify the contained information. Examples of these are:
176 176  
177 -* A descriptive title for the series (this is most useful for dissemination of data for viewing e.g. on the web)
171 +* A descriptive [[title>>doc:sdmx:Glossary.Title.WebHome]] for the series (this is most useful for dissemination of data for viewing e.g. on the web)
178 178  * Collection (e.g. end of period, averaged or summed over period)
179 -* Unit (e.g. currency of denomination)
173 +* Unit (e.g. [[currency>>doc:sdmx:Glossary.Currency.WebHome]] of denomination)
180 180  * Unit multiplier (e.g. expressed in millions)
181 181  * Availability (which institutions can a series become available to)
182 -* Decimals (i.e. number of decimal digits used in numerical observations)
183 -* Observation Status (e.g. estimate, provisional, normal)
176 +* Decimals (i.e. number of [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] digits used in numerical observations)
177 +* [[Observation Status>>doc:sdmx:Glossary.Observation status.WebHome]] (e.g. estimate, provisional, normal)
184 184  
185 -Moreover, additional attributes may be considered as mandatory when a specific data structure definition is defined.
179 +Moreover, additional [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] may be considered as mandatory when a specific [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] is defined.
186 186  
187 -**//Avoid creating a new code list where one already exists.//** It is highly recommended that structural definitions and code lists be consistent with internationally agreed standard methodologies, wherever they exist, e.g., System of National Accounts 1993; Balance of Payments Manual, Fifth Edition; Monetary and Financial Statistics Manual; Government Finance Statistics Manual, etc. When setting-up a new data exchange, the following order of priority is suggested when considering the use of code lists:
181 +**//Avoid creating a new [[code list>>doc:sdmx:Glossary.Code list.WebHome]] where one already exists.//** It is highly recommended that structural definitions and [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] be consistent with internationally agreed standard methodologies, wherever they exist, e.g., System of National Accounts 1993; Balance of Payments Manual, Fifth Edition; Monetary and Financial Statistics Manual; Government Finance Statistics Manual, etc. When setting-up a new data exchange, the following order of priority is suggested when considering the use of [[code lists>>doc:sdmx:Glossary.Code list.WebHome]]:
188 188  
189 -* international standard code lists;
190 -* international code lists supplemented by other international and/or regional institutions;
183 +* international standard [[code lists>>doc:sdmx:Glossary.Code list.WebHome]];
184 +* international [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] supplemented by other international and/or regional institutions;
191 191  * standardised lists used already by international institutions;
192 -* new code lists agreed between two international or regional institutions;
193 -* new specific code lists.
186 +* new [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] agreed between two international or regional institutions;
187 +* new specific [[code lists>>doc:sdmx:Glossary.Code list.WebHome]].
194 194  
195 -The same code list can be used for several statistical concepts, within a data structure definition or across DSDs. Note that SDMX has recognised that these classifications are often quite large and the usage of codes in any one DSD is only a small extract of the full code list. In this version of the standard it is possible to exchange and disseminate a **partial code list** which is extracted from the full code list and which supports the dimension values valid for a particular DSD.
189 +The same [[code list>>doc:sdmx:Glossary.Code list.WebHome]] can be used for several statistical (% style="color:#e74c3c" %)concepts(%%), within a [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] or across DSDs. Note that [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] has recognised that these classifications are often quite large and the usage of [[codes>>doc:sdmx:Glossary.Code.WebHome]] in any one [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] is only a small extract of the full [[code list>>doc:sdmx:Glossary.Code list.WebHome]]. In this (% style="color:#e74c3c" %)version(%%) of the standard it is possible to exchange and disseminate a **partial [[code list>>doc:sdmx:Glossary.Code list.WebHome]]** which is extracted from the full [[code list>>doc:sdmx:Glossary.Code list.WebHome]] and which supports the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] values valid for a particular [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
196 196  
197 -=== Data Structure Definition Structure  ===
191 +__Data Structure Definition Structure__
198 198  
199 -The following items have to be specified by a structural definitions maintenance agency when defining a new data structure definition:
193 +The following items have to be specified by a structural definitions [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]] when defining a new [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]:
200 200  
201 -Data structure definition (DSD) identification:
195 +[[Data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] ([[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]) identification:
202 202  
203 -* DSD identifier
204 -* DSD name
197 +* [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] identifier
198 +* [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] name
205 205  
206 -A list of metadata concepts assigned as dimensions of the data structure definition. For each:
200 +A list of metadata (% style="color:#e74c3c" %)concepts(%%) assigned as [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] of the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]. For each:
207 207  
208 -* (statistical) concept identifier
209 -* ordinal number of the dimension in the key structure (SDMX-EDI only)
210 -* code list identifier (Id, version, maintenance agency) if the representation is coded
202 +* (statistical) (% style="color:#e74c3c" %)concept(%%) identifier
203 +* ordinal number of the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] in the key structure ([[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] only)
204 +* [[code list>>doc:sdmx:Glossary.Code list.WebHome]] identifier (Id, (% style="color:#e74c3c" %)version(%%), [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]]) if the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is coded
211 211  
212 -A list of (statistical) concepts assigned as attributes for the data structure definition. For each:
206 +A list of (statistical) (% style="color:#e74c3c" %)concepts(%%) assigned as [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] for the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]. For each:
213 213  
214 -* (statistical) concept identifier
215 -* code list identifier if the concept is coded
208 +* (statistical) (% style="color:#e74c3c" %)concept(%%) identifier
209 +* [[code list>>doc:sdmx:Glossary.Code list.WebHome]] identifier if the (% style="color:#e74c3c" %)concept(%%) is coded
216 216  * assignment status: mandatory or conditional
217 -* attachment level
218 -* maximum text length for the uncoded concepts
219 -* maximum code length for the coded concepts
211 +* attachment (% style="color:#e74c3c" %)level
212 +* maximum text length for the uncoded (% style="color:#e74c3c" %)concepts
213 +* maximum [[code>>doc:sdmx:Glossary.Code.WebHome]] length for the coded (% style="color:#e74c3c" %)concepts
220 220  
221 -A list of the code lists used in the data structure definition. For each:
215 +A list of the [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] used in the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]. For each:
222 222  
223 -* code list identifier
224 -* code list name
225 -* code values and descriptions
217 +* [[code list>>doc:sdmx:Glossary.Code list.WebHome]] identifier
218 +* [[code list>>doc:sdmx:Glossary.Code list.WebHome]] name
219 +* [[code>>doc:sdmx:Glossary.Code.WebHome]] values and descriptions
226 226  
227 -Definition of data flow definitions.  Two (or more) partners performing data exchanges in a certain context need to agree on:
221 +Definition of [[data flow>>doc:sdmx:Glossary.Dataflow.WebHome]] definitions. Two (or more) partners performing data exchanges in a certain context need to agree on:
228 228  
229 -* the list of data set identifiers they will be using;
230 -* for each data flow:
223 +* the list of [[data set>>doc:sdmx:Glossary.Data set.WebHome]] identifiers they will be using;
224 +* for each [[data flow>>doc:sdmx:Glossary.Dataflow.WebHome]]:
231 231  * its content and description
232 -* the relevant DSD that defines the structure of the data reported or disseminated according the the dataflow definition
226 +* the relevant [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] that defines the structure of the data reported or disseminated according the the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] definition
233 233  
234 -**3.4.1.3 Exchanging Attributes**
228 +==== 3.4.1.3 Exchanging Attributes ====
235 235  
236 -**//3.4.1.3.1 Attributes on series, sibling and data set level //**//Static properties//.
230 +===== //3.4.1.3.1 Attributes on series, sibling and data set level // =====
237 237  
238 -* Upon creation of a series the sender has to provide to the receiver values for all mandatory attributes. In case they are available, values for conditional attributes  should also be provided. Whereas initially this information may be provided by means other than SDMX-ML or SDMX-EDI messages (e.g. paper, telephone) it is expected that partner institutions will be in a position to provide this information in SDMX-ML or SDMX-EDI format over time.
239 -* A centre may agree with its data exchange partners special procedures for authorising the setting of attributes' initial values.
240 -* Attribute values at a data set level are set and maintained exclusively by the centre administrating the exchanged data set.
232 +//Static properties//.
241 241  
234 +* Upon creation of a series the sender has to provide to the receiver values for all mandatory [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]. In case they are available, values for conditional [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] should also be provided. Whereas initially this information may be provided by means other than [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] or [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] messages (e.g. paper, telephone) it is expected that partner institutions will be in a position to provide this information in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] or [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] format over time.
235 +* A centre may agree with its data exchange partners special procedures for authorising the setting of [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]' initial values.
236 +* [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] values at a [[data set>>doc:sdmx:Glossary.Data set.WebHome]] (% style="color:#e74c3c" %)level(%%) are set and maintained exclusively by the centre administrating the exchanged [[data set>>doc:sdmx:Glossary.Data set.WebHome]].
237 +
242 242  //Communication of changes// to the centre.
243 243  
244 -* Following the creation of a series, the attribute values do not have to be reported again by senders, as long as they do not change.
245 -* Whenever changes in attribute values for a series (or sibling group) occur, the reporting institutions should report either all attribute values again (this is the recommended option) or only the attribute values which have changed.  This applies both to the mandatory and the conditional attributes. For example, if a previously reported value for a conditional attribute is no longer valid, this has to be reported to the centre.
246 -* A centre may agree with its data exchange partners special procedures for authorising modifications in the attribute values.
240 +* Following the creation of a series, the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] values do not have to be reported again by senders, as long as they do not change.
241 +* Whenever changes in [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] values for a series (or [[sibling group>>doc:sdmx:Glossary.Sibling group.WebHome]]) occur, the reporting institutions should report either all [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] values again (this is the recommended option) or only the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] values which have changed. This applies both to the mandatory and the conditional [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]. For example, if a previously reported value for a conditional [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is no longer valid, this has to be reported to the centre.
242 +* A centre may agree with its data exchange partners special procedures for authorising modifications in the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] values.
247 247  
248 -Communication of observation level attributes “observation status”, "observation confidentiality", "observation pre-break".
244 +Communication of observation (% style="color:#e74c3c" %)level(%%) [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] “[[observation status>>doc:sdmx:Glossary.Observation status.WebHome]]”, "observation [[confidentiality>>doc:sdmx:Glossary.Confidentiality.WebHome]]", "observation pre-break".
249 249  
250 -* In SDMX-EDI, the observation level attribute “observation status” is part of the fixed syntax of the ARR segment used for observation reporting. Whenever an observation is exchanged, the corresponding observation status must also be exchanged attached to the observation, regardless of whether it has changed or not since the previous data exchange. This rule also applies to the use of the SDMX-ML formats, although the syntax does not necessarily require this.
251 -* If the “observation status” changes and the observation remains unchanged, both components would have to be reported.
252 -* For Data Structure Definitions having also the observation level attributes “observation confidentiality” and "observation pre-break" defined, this rule applies to these attribute as well: if an institution receives from another institution an observation with an observation status attribute only attached, this means that the associated observation confidentiality and prebreak observation attributes either never existed or from now they do not have a value for this observation.
246 +* In [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]], the observation (% style="color:#e74c3c" %)level(%%) [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] “[[observation status>>doc:sdmx:Glossary.Observation status.WebHome]]” is part of the fixed syntax of the ARR segment used for observation reporting. Whenever an observation is exchanged, the corresponding [[observation status>>doc:sdmx:Glossary.Observation status.WebHome]] must also be exchanged attached to the observation, regardless of whether it has changed or not since the previous data exchange. This rule also applies to the use of the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] formats, although the syntax does not necessarily require this.
247 +* If the “[[observation status>>doc:sdmx:Glossary.Observation status.WebHome]]” changes and the observation remains unchanged, both [[components>>doc:sdmx:Glossary.Component.WebHome]] would have to be reported.
248 +* For [[Data Structure Definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] having also the observation (% style="color:#e74c3c" %)level(%%) [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] “observation [[confidentiality>>doc:sdmx:Glossary.Confidentiality.WebHome]]” and "observation pre-break" defined, this rule applies to these [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] as well: if an institution receives from another institution an observation with an [[observation status>>doc:sdmx:Glossary.Observation status.WebHome]] [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] only attached, this means that the associated observation [[confidentiality>>doc:sdmx:Glossary.Confidentiality.WebHome]] and prebreak observation [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] either never existed or from now they do not have a value for this observation.
253 253  
254 -==== 3.4.2 Best Practices for Batch Data Exchange ====
250 +=== 3.4.2 Best Practices for Batch Data Exchange ===
255 255  
256 -**3.4.2.1 Introduction**
252 +==== 3.4.2.1 Introduction ====
257 257  
258 -Batch data exchange is the exchange and maintenance of entire databases between counterparties. It is an activity that often employs SDMX-EDI formats, and might also use the SDMX-ML DSD-specific data set. The following points apply equally to both formats.
254 +Batch data exchange is the exchange and maintenance of entire databases between counterparties. It is an activity that often employs [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] formats, and might also use the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]-specific [[data set>>doc:sdmx:Glossary.Data set.WebHome]]. The following points apply equally to both formats.
259 259  
260 -**3.4.2.2 Positioning of the Dimension "Frequency"**
256 +==== 3.4.2.2 Positioning of the Dimension "Frequency" ====
261 261  
262 -The position of the “frequency” dimension is unambiguously identified in the data structure definition. Moreover, most central institutions devising structural definitions have decided to assign to this dimension the first position in the key structure. This facilitates the easy identification of this dimension, something that it is necessary to frequency's crucial role in several database systems and in attaching attributes at the “sibling” group level.
258 +The position of the “frequency” [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] is unambiguously identified in the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]. Moreover, most central institutions devising structural definitions have decided to assign to this [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] the first position in the key structure. This facilitates the easy identification of this [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]], something that it is necessary to frequency's crucial role in several database systems and in attaching [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] at the “sibling” group (% style="color:#e74c3c" %)level(%%).
263 263  
264 -**3.4.2.3 Identification of Data Structure Definitions (DSDs)**
260 +==== 3.4.2.3 Identification of Data Structure Definitions (DSDs) ====
265 265  
266 -In order to facilitate the easy and immediate recognition of the structural definition maintenance agency that defined a data structure definition, most central institutions devising structural definitions use the first characters of the data structure definition identifiers to identify their institution: e.g. BIS_EER, EUROSTAT_BOP_01, ECB_BOP1, etc.
262 +In order to facilitate the easy and immediate recognition of the structural definition [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]] that defined a [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]], most central institutions devising structural definitions use the first characters of the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] identifiers to identify their institution: e.g. BIS_EER, EUROSTAT_BOP_01, ECB_BOP1, etc.
267 267  
268 -**3.4.2.4 Identification of the Data Flows**
264 +==== 3.4.2.4 Identification of the Data Flows ====
269 269  
270 -In order to facilitate the easy and immediate recognition of the institution administrating a data flow definitions, many central institutions prefer to use the first characters of the data flow definition identifiers to identify their institution: e.g. BIS_EER, ECB_BOP1, ECB_BOP1, etc. Note that in GESMES/TS the Data Set plays the role of the data flow definition (see //DataSet //in the SDMX-IM//)//.
266 +In order to facilitate the easy and immediate recognition of the institution administrating a [[data flow>>doc:sdmx:Glossary.Dataflow.WebHome]] definitions, many central institutions prefer to use the first characters of the [[data flow>>doc:sdmx:Glossary.Dataflow.WebHome]] definition identifiers to identify their institution: e.g. BIS_EER, ECB_BOP1, ECB_BOP1, etc. Note that in GESMES/TS the [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] plays the role of the [[data flow>>doc:sdmx:Glossary.Dataflow.WebHome]] definition (see //[[DataSet>>doc:sdmx:Glossary.Data set.WebHome]] //in the [[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]]//)//.
271 271  
272 -The statistical information in SDMX is broken down into two fundamental parts - structural metadata (comprising the Data Structure Definition, and associated Concepts and Code Lists) - see Framework for Standards -, and observational data (the DataSet). This is an important distinction, with specific terminology associated with each part. Data - which is typically a set of numeric observations at specific points in time - is organized into data sets (//DataSet//) These data sets are structured according to a specific Data Structure Definition (//DataStructureDefinition//) and are described in the data flow definition (//DataflowDefinition)// The Data Structure Definition describes the metadata that allows an understanding of what is expressed in the data set, whilst the data flow definition provides the identifier and other important information (such as the periodicity of reporting) that is common to all of its component data sets.
268 +The statistical information in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is broken down into two fundamental parts - [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]] (comprising the [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]], and associated (% style="color:#e74c3c" %)Concepts(%%) and [[Code Lists>>doc:sdmx:Glossary.Code list.WebHome]]) - see Framework for Standards -, and observational data (the [[DataSet>>doc:sdmx:Glossary.Data set.WebHome]]). This is an important distinction, with specific terminology associated with each part. Data - which is typically a set of numeric observations at specific points in time - is organized into [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] (//[[DataSet>>doc:sdmx:Glossary.Data set.WebHome]]//) These [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] are structured according to a specific [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] (//DataStructureDefinition//) and are described in the [[data flow>>doc:sdmx:Glossary.Dataflow.WebHome]] definition (//DataflowDefinition)// The [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] describes the metadata that allows an understanding of what is expressed in the [[data set>>doc:sdmx:Glossary.Data set.WebHome]], whilst the [[data flow>>doc:sdmx:Glossary.Dataflow.WebHome]] definition provides the identifier and other important information (such as the periodicity of reporting) that is common to all of its [[component>>doc:sdmx:Glossary.Component.WebHome]] [[data sets>>doc:sdmx:Glossary.Data set.WebHome]].
273 273  
274 -Note that the role of the Data Flow (called //DataflowDefintion// in the model) and Data Set is very specific in the model, and the terminology used may not be the same as used in all organisations, and specifically the term Data Set is used differently in SDMX than in GESMES/TS. Essentially the GESMES/TS term "Data Set" is, in SDMX, the "Dataflow Definition" whist the term "Data Set" in SDMX is used to describe the "container" for an instance of the data.
270 +Note that the role of the [[Data Flow>>doc:sdmx:Glossary.Dataflow.WebHome]] (called //DataflowDefintion// in the model) and [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] is very specific in the model, and the terminology used may not be the same as used in all organisations, and specifically the term [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] is used differently in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] than in GESMES/TS. Essentially the GESMES/TS term [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] is, in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] Definition" whist the term [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is used to describe the "container" for an instance of the data.
275 275  
276 -**3.4.2.5 Special Issues**
272 +==== 3.4.2.5 Special Issues ====
277 277  
278 278  ===== 3.4.2.5.1 "Frequency" related issues =====
279 279  
280 280  **//Special frequencies.//** The issue of data collected at special (regular or irregular) intervals at a lower than daily frequency (e.g. 24 or 36 or 48 observations per year, on irregular days during the year) is not extensively discussed here. However, for data exchange purposes:
281 281  
282 -* such data can be mapped into a series with daily frequency; this daily series will only hold observations for those days on which the measured event takes place;
283 -* if the collection intervals are regular, additional values to the existing frequency code list(s) could be added in the future.
278 +* such data can be (% style="color:#e74c3c" %)mapped(%%) into a series with daily frequency; this daily series will only hold observations for those days on which the measured event takes place;
279 +* if the collection intervals are regular, additional values to the existing frequency [[code list>>doc:sdmx:Glossary.Code list.WebHome]](s) could be added in the future.
284 284  
285 -**//Tick data.//** The issue of data collected at irregular intervals at a higher than daily frequency (e.g. tick-by-tick data) is not discussed here either. However, for data exchange purposes, such series can already be exchanged in the SDMX-EDI format by using the option to send observations with the associated time stamp.
281 +**//Tick data.//** The issue of data collected at irregular intervals at a higher than daily frequency (e.g. tick-by-tick data) is not discussed here either. However, for data exchange purposes, such series can already be exchanged in the [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] format by using the option to send observations with the associated time stamp.
286 286  
287 -
288 288  = 4 General Notes for Implementers =
289 289  
290 -This section discusses a number of topics other than the exchange of data sets in SDMX-ML and SDMX-EDI. Supported only in SDMX-ML, these topics include the use of the reference metadata mechanism in SDMX, the use of Structure Sets and Reporting Taxonomies, the use of Processes, a discussion of time and data-typing, and some of the conventional mechanisms within the SDMX-ML Structure message regarding versioning and external referencing.
285 +This section discusses a number of topics other than the exchange of [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] and [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]]. Supported only in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]], these topics include the use of the [[reference metadata>>doc:sdmx:Glossary.Reference metadata.WebHome]] mechanism in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], the use of [[Structure Sets>>doc:sdmx:Glossary.Structure set.WebHome]] and [[Reporting Taxonomies>>doc:sdmx:Glossary.Reporting taxonomy.WebHome]], the use of Processes, a discussion of time and data-typing, and some of the conventional mechanisms within the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] Structure message regarding versioning and external referencing.
291 291  
292 292  This section does not go into great detail on these topics, but provides a useful overview of these features to assist implementors in further use of the parts of the specification which are relevant to them.
293 293  
294 294  == 4.1 Representations ==
295 295  
296 -There are several different representations in SDMX-ML, taken from XML Schemas and common programming languages. The table below describes the various representations which are found in SDMX-ML, and their equivalents.
291 +There are several different [[representations>>doc:sdmx:Glossary.Representation.WebHome]] in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]], taken from XML Schemas and common programming languages. The table below describes the various [[representations>>doc:sdmx:Glossary.Representation.WebHome]] which are found in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]], and their equivalents.
297 297  
298 -|**SDMX-ML Data Type**|**XML Schema Data Type**|**.NET Framework Type**|(((
299 -**Java Data Type**
300 -
301 -**~ **
293 +(% style="width:912.294px" %)
294 +|(% style="width:172px" %)**SDMX-ML Data Type**|(% style="width:204px" %)**XML Schema Data Type**|(% style="width:189px" %)**.NET Framework Type**|(% style="width:342px" %)(((
295 +**Java Data Type **
302 302  )))
303 -|String|xsd:string|System.String|java.lang.String
304 -|Big Integer|xsd:integer|System.Decimal|java.math.BigInteg er
305 -|Integer|xsd:int|System.Int32|int
306 -|Long|xsd.long|System.Int64|long
307 -|Short|xsd:short|System.Int16|short
308 -|Decimal|xsd:decimal|System.Decimal|java.math.BigDecim al
309 -|Float|xsd:float|System.Single|float
310 -|Double|xsd:double|System.Double|double
311 -|Boolean|xsd:boolean|System.Boolean|boolean
312 -|URI|xsd:anyURI|System.Uri|Java.net.URI or java.lang.String
313 -|DateTime|xsd:dateTime|System.DateTim e|javax.xml.datatype .XMLGregorianCalen dar
314 -|Time|xsd:time|System.DateTim e|javax.xml.datatype .XMLGregorianCalen dar
315 -|GregorianYear|xsd:gYear|System.DateTim e|javax.xml.datatype .XMLGregorianCalen dar
316 -|GregorianMont h|xsd:gYearMont h|System.DateTim e|javax.xml.datatype .XMLGregorianCalen dar
317 -|GregorianDay|xsd:date|System.DateTim e|javax.xml.datatype .XMLGregorianCalen dar
318 -|(((
319 -Day,
297 +|(% style="width:172px" %)String|(% style="width:204px" %)xsd:string|(% style="width:189px" %)System.String|(% style="width:342px" %)java.lang.String
298 +|(% style="width:172px" %)Big Integer|(% style="width:204px" %)xsd:integer|(% style="width:189px" %)System.Decimal|(% style="width:342px" %)java.math.BigInteg er
299 +|(% style="width:172px" %)Integer|(% style="width:204px" %)xsd:int|(% style="width:189px" %)System.Int32|(% style="width:342px" %)int
300 +|(% style="width:172px" %)Long|(% style="width:204px" %)xsd.long|(% style="width:189px" %)System.Int64|(% style="width:342px" %)long
301 +|(% style="width:172px" %)Short|(% style="width:204px" %)xsd:short|(% style="width:189px" %)System.Int16|(% style="width:342px" %)short
302 +|(% style="width:172px" %)Decimal|(% style="width:204px" %)xsd:decimal|(% style="width:189px" %)System.Decimal|(% style="width:342px" %)java.math.BigDecim al
303 +|(% style="width:172px" %)Float|(% style="width:204px" %)xsd:float|(% style="width:189px" %)System.Single|(% style="width:342px" %)float
304 +|(% style="width:172px" %)Double|(% style="width:204px" %)xsd:double|(% style="width:189px" %)System.Double|(% style="width:342px" %)double
305 +|(% style="width:172px" %)Boolean|(% style="width:204px" %)xsd:boolean|(% style="width:189px" %)System.Boolean|(% style="width:342px" %)boolean
306 +|(% style="width:172px" %)URI|(% style="width:204px" %)xsd:anyURI|(% style="width:189px" %)System.Uri|(% style="width:342px" %)Java.net.URI or java.lang.String
307 +|(% style="width:172px" %)DateTime|(% style="width:204px" %)xsd:dateTime|(% style="width:189px" %)System.DateTime|(% style="width:342px" %)javax.xml.datatype .XMLGregorianCalen dar
308 +|(% style="width:172px" %)Time|(% style="width:204px" %)xsd:time|(% style="width:189px" %)System.DateTime|(% style="width:342px" %)javax.xml.datatype .XMLGregorianCalen dar
309 +|(% style="width:172px" %)GregorianYear|(% style="width:204px" %)xsd:gYear|(% style="width:189px" %)System.DateTime|(% style="width:342px" %)javax.xml.datatype .XMLGregorianCalen dar
310 +|(% style="width:172px" %)GregorianMonth|(% style="width:204px" %)xsd:gYearMonth|(% style="width:189px" %)System.DateTime|(% style="width:342px" %)javax.xml.datatype .XMLGregorianCalen dar
311 +|(% style="width:172px" %)GregorianDay|(% style="width:204px" %)xsd:date|(% style="width:189px" %)System.DateTime|(% style="width:342px" %)javax.xml.datatype .XMLGregorianCalen dar
312 +|(% style="width:172px" %)(((
313 +Day, MonthDay, Month
314 +)))|(% style="width:204px" %)xsd:g*|(% style="width:189px" %)System.DateTime|(% style="width:342px" %)javax.xml.datatype .XMLGregorianCalen dar
315 +|(% style="width:172px" %)Duration|(% style="width:204px" %)xsd:duration |(% style="width:189px" %)System.TimeSpa|(% style="width:342px" %)javax.xml.datatype
316 +|(% style="width:172px" %) |(% style="width:204px" %) |(% style="width:189px" %)n|(% style="width:342px" %).Duration
320 320  
321 -MonthDay, Month
322 -)))|xsd:g*|System.DateTim e|javax.xml.datatype .XMLGregorianCalen dar
323 -|Duration|xsd:duration |System.TimeSpa|javax.xml.datatype
324 -|**SDMX-ML Data Type**|**XML Schema Data Type**|**.NET Framework Type**|(((
325 -**Java Data Type**
318 +There are also a number of [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] data types which do not have these direct correspondences, often because they are composite [[representations>>doc:sdmx:Glossary.Representation.WebHome]] or restrictions of a broader data type. For most of these, there are simple types which can be referenced from the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] schemas, for others a derived simple type will be necessary:
326 326  
327 -**~ **
328 -)))
329 -| | |n|.Duration
330 -
331 -There are also a number of SDMX-ML data types which do not have these direct correspondences, often because they are composite representations or restrictions of a broader data type. For most of these, there are simple types which can be referenced from the SDMX schemas, for others a derived simple type will be necessary:
332 -
333 333  * AlphaNumeric (common:AlphaNumericType, string which only allows A-z and 0-9)
334 334  * Alpha (common:AlphaType, string which only allows A-z)
335 335  * Numeric (common:NumericType, string which only allows 0-9, but is not numeric so that is can having leading zeros)
336 336  * Count (xs:integer, a sequence with an interval of “1”)
337 -* InclusiveValueRange (xs:decimal with the minValue and maxValue facets supplying the bounds)
338 -* ExclusiveValueRange (xs:decimal with the minValue and maxValue facets supplying the bounds)
324 +* InclusiveValueRange (xs:decimal with the minValue and maxValue [[facets>>doc:sdmx:Glossary.Facet.WebHome]] supplying the bounds)
325 +* ExclusiveValueRange (xs:decimal with the minValue and maxValue [[facets>>doc:sdmx:Glossary.Facet.WebHome]] supplying the bounds)
339 339  * Incremental (xs:decimal with a specified interval; the interval is typically enforced outside of the XML validation)
340 340  * TimeRange (common:TimeRangeType, start DateTime + Duration,)
341 -* ObservationalTimePeriod (common: ObservationalTimePeriodType,  a union of StandardTimePeriod and TimeRange).
328 +* ObservationalTimePeriod (common: ObservationalTimePeriodType, a union of StandardTimePeriod and TimeRange).
342 342  * StandardTimePeriod (common: StandardTimePeriodType, a union of BasicTimePeriod and TimeRange).
343 343  * BasicTimePeriod (common: BasicTimePeriodType, a union of GregorianTimePeriod and DateTime)
344 344  * GregorianTimePeriod (common:GregorianTimePeriodType, a union of GregorianYear, GregorianMonth, and GregorianDay)
... ... @@ -353,32 +353,30 @@
353 353  * KeyValues (common:DataKeyType)
354 354  * IdentifiableReference (types for each identifiable object)
355 355  * DataSetReference (common:DataSetReferenceType)
356 -* AttachmentConstraintReference
343 +* AttachmentConstraintReference (common:AttachmentConstraintReferenceType)
357 357  
358 -(common:AttachmentConstraintReferenceType)
345 +Data types also have a set of [[facets>>doc:sdmx:Glossary.Facet.WebHome]]:
359 359  
360 -Data types also have a set of facets:
361 -
362 362  * isSequence = true | false (indicates a sequentially increasing value)
363 363  * minLength = positive integer (# of characters/digits)
364 364  * maxLength = positive integer (# of characters/digits)
365 -* startValue = decimal (for numeric sequence)
366 -* endValue = decimal (for numeric sequence)
367 -* interval = decimal (for numeric sequence)
350 +* startValue = [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] (for numeric sequence)
351 +* endValue = [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] (for numeric sequence)
352 +* interval = [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] (for numeric sequence)
368 368  * timeInterval = duration
369 369  * startTime = BasicTimePeriod (for time range)
370 370  * endTime = BasicTimePeriod (for time range)
371 -* minValue = decimal (for numeric range)
372 -* maxValue = decimal (for numeric range)
373 -* decimal = Integer (# of digits to right of decimal point)
356 +* minValue = [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] (for numeric range)
357 +* maxValue = [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] (for numeric range)
358 +* [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] = Integer (# of digits to right of [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] point)
374 374  * pattern = (a regular expression, as per W3C XML Schema)
375 375  * isMultiLingual = boolean (for specifying text can occur in more than one language)
376 376  
377 -Note that code lists may also have textual representations assigned to them, in addition to their enumeration of codes.s
362 +Note that [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] may also have textual [[representations>>doc:sdmx:Glossary.Representation.WebHome]] assigned to them, in addition to their enumeration of codes.s
378 378  
379 379  == 4.2 Time and Time Format ==
380 380  
381 -==== 4.2.1 Introduction ====
366 +=== 4.2.1 Introduction ===
382 382  
383 383  First, it is important to recognize that most observation times are a period. SDMX specifies precisely how Time is handled.
384 384  
... ... @@ -386,50 +386,47 @@
386 386  
387 387  The hierarchy of time formats is as follows (**bold** indicates a category which is made up of multiple formats, //italic// indicates a distinct format):
388 388  
389 -* **Observational Time Period **o **Standard Time Period**
374 +* **Observational Time Period**
375 +** **Standard Time Period**
376 +*** **Basic Time Period**
377 +**** **Gregorian Time Period**
378 +**** //Date Time//
379 +*** **Reporting Time Period**
380 +** //Time Range//
390 390  
391 - § **Basic Time Period**
392 -
393 -* **Gregorian Time Period**
394 -* //Date Time//
395 -
396 -§ **Reporting Time Period **o //Time Range//
397 -
398 398  The details of these time period categories and of the distinct formats which make them up are detailed in the sections to follow.
399 399  
400 -==== 4.2.2 Observational Time Period ====
384 +=== 4.2.2 Observational Time Period ===
401 401  
402 -This is the superset of all time representations in SDMX. This allows for time to be expressed as any of the allowable formats.
386 +This is the superset of all time [[representations>>doc:sdmx:Glossary.Representation.WebHome]] in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]. This allows for time to be expressed as any of the allowable formats.
403 403  
404 -==== 4.2.3 Standard Time Period ====
388 +=== 4.2.3 Standard Time Period ===
405 405  
406 -This is the superset of any predefined time period or a distinct point in time. A time period consists of a distinct start and end point. If the start and end of a period are expressed as date instead of a complete date time, then it is implied that the start of the period is the beginning of the start day (i.e. 00:00:00) and the end of the period is the end of the end day (i.e. 23:59:59).
390 +This is the superset of any predefined [[time period>>doc:sdmx:Glossary.Time period.WebHome]] or a distinct point in time. A [[time period>>doc:sdmx:Glossary.Time period.WebHome]] consists of a distinct start and end point. If the start and end of a period are expressed as date instead of a complete date time, then it is implied that the start of the period is the beginning of the start day (i.e. 00:00:00) and the end of the period is the end of the end day (i.e. 23:59:59).
407 407  
408 -==== 4.2.4 Gregorian Time Period ====
392 +=== 4.2.4 Gregorian Time Period ===
409 409  
410 -A Gregorian time period is always represented by a Gregorian year, year-month, or day. These are all based on ISO 8601 dates. The representation in SDMX-ML messages and the period covered by each of the Gregorian time periods are as follows:
394 +A Gregorian [[time period>>doc:sdmx:Glossary.Time period.WebHome]] is always represented by a Gregorian year, year-month, or day. These are all based on ISO 8601 dates. The [[representation>>doc:sdmx:Glossary.Representation.WebHome]] in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] messages and the period covered by each of the Gregorian [[time periods>>doc:sdmx:Glossary.Time period.WebHome]] are as follows:
411 411  
412 -**Gregorian Year:**
413 -
396 +**Gregorian Year:**
414 414  Representation: xs:gYear (YYYY)
398 +Period: the start of January 1 to the end of December 31
415 415  
416 -Period: the start of January 1 to the end of December 31 **Gregorian Year Month**:
417 -
400 +**Gregorian Year Month**:
418 418  Representation: xs:gYearMonth (YYYY-MM)
402 +Period: the start of the first day of the month to end of the last day of the month
419 419  
420 -Period: the start of the first day of the month to end of the last day of the month **Gregorian Day**:
421 -
404 +**Gregorian Day**:
422 422  Representation: xs:date (YYYY-MM-DD)
423 -
424 424  Period: the start of the day (00:00:00) to the end of the day (23:59:59)
425 425  
426 -==== 4.2.5 Date Time ====
408 +=== 4.2.5 Date Time ===
427 427  
428 -This is used to unambiguously state that a date-time represents an observation at a single point in time. Therefore, if one wants to use SDMX for data which is measured at a distinct point in time rather than being reported over a period, the date-time representation can be used.
410 +This is used to unambiguously state that a date-time represents an observation at a single point in time. Therefore, if one wants to use [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] for data which is measured at a distinct point in time rather than being reported over a period, the date-time [[representation>>doc:sdmx:Glossary.Representation.WebHome]] can be used.
429 429  
430 -Representation: xs:dateTime (YYYY-MM-DDThh:mm:ss)[[^^~[1~]^^>>path:#_ftn1]]
412 +[[Representation>>doc:sdmx:Glossary.Representation.WebHome]]: xs:dateTime (YYYY-MM-DDThh:mm:ss){{footnote}}The seconds can be reported fractionally{{/footnote}}
431 431  
432 -==== 4.2.6 Standard Reporting Period ====
414 +=== 4.2.6 Standard Reporting Period ===
433 433  
434 434  Standard reporting periods are periods of time in relation to a reporting year. Each of these standard reporting periods has a duration (based on the ISO 8601 definition) associated with it. The general format of a reporting period is as follows:
435 435  
... ... @@ -436,75 +436,52 @@
436 436  [REPORTING_YEAR]-[PERIOD_INDICATOR][PERIOD_VALUE]
437 437  
438 438  Where:
439 -
440 440  REPORTING_YEAR represents the reporting year as four digits (YYYY) PERIOD_INDICATOR identifies the type of period which determines the duration of the period
441 -
442 442  PERIOD_VALUE indicates the actual period within the year
443 443  
444 -The following section details each of the standard reporting periods defined in SDMX:
424 +The following section details each of the standard reporting periods defined in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]:
445 445  
446 -**Reporting Year**:
447 -
448 - Period Indicator: A
449 -
426 +**Reporting Year**:
427 +Period Indicator: A
450 450  Period Duration: P1Y (one year)
451 -
452 452  Limit per year: 1
430 +Representation: common:ReportingYearType (YYYY-A1, e.g. 2000-A1)
453 453  
454 -Representation: common:ReportingYearType (YYYY-A1, e.g. 2000-A1) **Reporting Semester:**
455 -
456 - Period Indicator: S
457 -
432 +**Reporting Semester:**
433 +Period Indicator: S
458 458  Period Duration: P6M (six months)
459 -
460 460  Limit per year: 2
436 +Representation: common:ReportingSemesterType (YYYY-Ss, e.g. 2000-S2)
461 461  
462 -Representation: common:ReportingSemesterType (YYYY-Ss, e.g. 2000-S2) **Reporting Trimester:**
463 -
464 - Period Indicator: T
465 -
438 +**Reporting Trimester:**
439 +Period Indicator: T
466 466  Period Duration: P4M (four months)
467 -
468 468  Limit per year: 3
442 +Representation: common:ReportingTrimesterType (YYYY-Tt, e.g. 2000-T3)
469 469  
470 -Representation: common:ReportingTrimesterType (YYYY-Tt, e.g. 2000-T3) **Reporting Quarter:**
471 -
472 - Period Indicator: Q
473 -
444 +**Reporting Quarter:**
445 +Period Indicator: Q
474 474  Period Duration: P3M (three months)
475 -
476 476  Limit per year: 4
448 +Representation: common:ReportingQuarterType (YYYY-Qq, e.g. 2000-Q4)
477 477  
478 -Representation: common:ReportingQuarterType (YYYY-Qq, e.g. 2000-Q4) **Reporting Month**:
479 -
450 +**Reporting Month**:
480 480  Period Indicator: M
481 -
482 482  Period Duration: P1M (one month)
483 -
484 484  Limit per year: 1
485 -
486 486  Representation: common:ReportingMonthType (YYYY-Mmm, e.g. 2000-M12) Notes: The reporting month is always represented as two digits, therefore 1-9 are 0 padded (e.g. 01). This allows the values to be sorted chronologically using textual sorting methods.
487 487  
488 488  **Reporting Week**:
489 -
490 490  Period Indicator: W
491 -
492 492  Period Duration: P7D (seven days)
493 -
494 494  Limit per year: 53
495 -
496 496  Representation: common:ReportingWeekType (YYYY-Www, e.g. 2000-W53)
461 +Notes: There are either 52 or 53 weeks in a reporting year. This is based on the ISO 8601 definition of a week (Monday - Saturday), where the first week of a reporting year is defined as the week with the first Thursday on or after the reporting year start day.{{footnote}}ISO 8601 defines alternative definitions for the first week, all of which produce equivalent results. Any of these definitions could be substituted so long as they are in relation to the reporting year start day.{{/footnote}} The reporting week is always represented as two digits, therefore 1-9 are 0 padded (e.g. 01). This allows the values to be sorted chronologically using textual sorting methods.
497 497  
498 -Notes: There are either 52 or 53 weeks in a reporting year. This is based on the ISO 8601 definition of a week (Monday - Saturday), where the first week of a reporting year is defined as the week with the first Thursday on or after the reporting year start day.[[^^~[2~]^^>>path:#_ftn2]] The reporting week is always represented as two digits, therefore 1-9 are 0 padded (e.g. 01). This allows the values to be sorted chronologically using textual sorting methods.
499 -
500 500  **Reporting Day**:
501 -
502 502  Period Indicator: D
503 -
504 504  Period Duration: P1D (one day)
505 -
506 506  Limit per year: 366
507 -
508 508  Representation: common:ReportingDayType (YYYY-Dddd, e.g. 2000-D366) Notes: There are either 365 or 366 days in a reporting year, depending on whether the reporting year includes leap day (February 29). The reporting day is always represented as three digits, therefore 1-99 are 0 padded (e.g. 001).
509 509  
510 510  This allows the values to be sorted chronologically using textual sorting methods.
... ... @@ -511,149 +511,116 @@
511 511  
512 512  The meaning of a reporting year is always based on the start day of the year and requires that the reporting year is expressed as the year at the start of the period. This start day is always the same for a reporting year, and is expressed as a day and a month (e.g. July 1). Therefore, the reporting year 2000 with a start day of July 1 begins on July 1, 2000.
513 513  
514 -A specialized attribute (reporting year start day) exists for the purpose of communicating the reporting year start day. This attribute has a fixed identifier (REPORTING_YEAR_START_DAY) and a fixed representation (xs:gMonthDay) so that it can always be easily identified and processed in a data message. Although this attribute exists in specialized sub-class, it functions the same as any other attribute outside of its identification and representation. It must takes its identity from a concept and state its relationship with other components of the data structure definition. The ability to state this relationship allows this reporting year start day attribute to exist at the appropriate levels of a data message. In the absence of this attribute, the reporting year start date is assumed to be January 1; therefore if the reporting year coincides with the calendar year, this Attribute is not necessary.
473 +A specialized [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] (reporting year start day) exists for the purpose of communicating the reporting year start day. This [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] has a fixed identifier (REPORTING_YEAR_START_DAY) and a fixed [[representation>>doc:sdmx:Glossary.Representation.WebHome]] (xs:gMonthDay) so that it can always be easily identified and processed in a data message. Although this [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] exists in specialized sub-class, it functions the same as any other [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] outside of its identification and [[representation>>doc:sdmx:Glossary.Representation.WebHome]]. It must takes its identity from a (% style="color:#e74c3c" %)concept(%%) and state its relationship with other [[components>>doc:sdmx:Glossary.Component.WebHome]] of the [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]. The ability to state this relationship allows this reporting year start day [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] to exist at the appropriate (% style="color:#e74c3c" %)levels(%%) of a data message. In the absence of this [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]], the reporting year start date is assumed to be January 1; therefore if the reporting year coincides with the calendar year, this [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is not necessary.
515 515  
516 516  Since the duration and the reporting year start day are known for any reporting period, it is possible to relate any reporting period to a distinct calendar period. The actual Gregorian calendar period covered by the reporting period can be computed as follows (based on the standard format of [REPROTING_YEAR][PERIOD_INDICATOR][PERIOD_VALUE] and the reporting year start day as [REPORTING_YEAR_START_DAY]):
517 517  
518 -1. **Determine [REPORTING_YEAR_BASE]:**
519 -
477 +**~1. Determine [REPORTING_YEAR_BASE]:**
520 520  Combine [REPORTING_YEAR] of the reporting period value (YYYY) with [REPORTING_YEAR_START_DAY] (MM-DD) to get a date (YYYY-MM-DD).
521 -
522 522  This is the [REPORTING_YEAR_START_DATE]
523 -
524 -**a) If the [PERIOD_INDICATOR] is W:**
525 -
526 -1.
527 -11.
528 -111.
529 -1111. **If [REPORTING_YEAR_START_DATE] is a Friday, Saturday, or Sunday:**
530 -
480 +**a) If the [PERIOD_INDICATOR] is W:
481 +~1. If [REPORTING_YEAR_START_DATE] is a Friday, Saturday, or Sunday:**
531 531  Add^^3^^ (P3D, P2D, or P1D respectively) to the [REPORTING_YEAR_START_DATE]. The result is the [REPORTING_YEAR_BASE].
532 532  
533 -1.
534 -11.
535 -111.
536 -1111. **If [REPORTING_YEAR_START_DATE] is a Monday, Tuesday, Wednesday, or Thursday:**
537 -
484 +2. **If [REPORTING_YEAR_START_DATE] is a Monday, Tuesday, Wednesday, or Thursday:**
538 538  Add^^3^^ (P0D, -P1D, -P2D, or -P3D respectively) to the [REPORTING_YEAR_START_DATE]. The result is the [REPORTING_YEAR_BASE].
486 +b) **Else:** 
487 +The [REPORTING_YEAR_START_DATE] is the [REPORTING_YEAR_BASE]
539 539  
540 -b) **Else:**
489 +**2. Determine [PERIOD_DURATION]:**
541 541  
542 -The [REPORTING_YEAR_START_DATE] is the [REPORTING_YEAR_BASE].
491 +a) If the [PERIOD_INDICATOR] is A, the [PERIOD_DURATION] is P1Y.
492 +b) If the [PERIOD_INDICATOR] is S, the [PERIOD_DURATION] is P6M.
493 +c) If the [PERIOD_INDICATOR] is T, the [PERIOD_DURATION] is P4M.
494 +d) If the [PERIOD_INDICATOR] is Q, the [PERIOD_DURATION] is P3M.
495 +e) If the [PERIOD_INDICATOR] is M, the [PERIOD_DURATION] is P1M.
496 +f) If the [PERIOD_INDICATOR] is W, the [PERIOD_DURATION] is P7D.
497 +g) If the [PERIOD_INDICATOR] is D, the [PERIOD_DURATION] is P1D.
543 543  
544 -1. **Determine [PERIOD_DURATION]:**
545 -11.
546 -111. If the [PERIOD_INDICATOR] is A, the [PERIOD_DURATION] is P1Y.
547 -111. If the [PERIOD_INDICATOR] is S, the [PERIOD_DURATION] is P6M.
548 -111. If the [PERIOD_INDICATOR] is T, the [PERIOD_DURATION] is P4M.
549 -111. If the [PERIOD_INDICATOR] is Q, the [PERIOD_DURATION] is P3M.
550 -111. If the [PERIOD_INDICATOR] is M, the [PERIOD_DURATION] is P1M.
551 -111. If the [PERIOD_INDICATOR] is W, the [PERIOD_DURATION] is P7D.
552 -111. If the [PERIOD_INDICATOR] is D, the [PERIOD_DURATION] is P1D.
553 -1. **Determine [PERIOD_START]:**
499 +**3. Determine [PERIOD_START]:**
554 554  
555 -Subtract one from the [PERIOD_VALUE] and multiply this by the [PERIOD_DURATION]. Add[[^^~[3~]^^>>path:#_ftn3]] this to the [REPORTING_YEAR_BASE]. The result is the [PERIOD_START].
501 +Subtract one from the [PERIOD_VALUE] and multiply this by the [PERIOD_DURATION]. Add{{footnote}}The rules for adding durations to a date time are described in the W3C XML Schema specification. See http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes for further details.{{/footnote}} this to the [REPORTING_YEAR_BASE]. The result is the [PERIOD_START].
556 556  
557 -1. **Determine the [PERIOD_END]:**
503 +**4. Determine the [PERIOD_END]:**
504 +Multiply the [PERIOD_VALUE] by the [PERIOD_DURATION]. Add{{footnote}}The rules for adding durations to a date time are described in the W3C XML Schema specification. See http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes for further details.{{/footnote}} this to the [REPORTING_YEAR_BASE] add{{footnote}}The rules for adding durations to a date time are described in the W3C XML Schema specification. See http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes for further details.{{/footnote}} -P1D. The result is the [PERIOD_END].
558 558  
559 -Multiply the [PERIOD_VALUE] by the [PERIOD_DURATION]. Add^^3^^ this to the [REPORTING_YEAR_BASE] add^^3^^ -P1D. The result is the [PERIOD_END].
560 -
561 561  For all of these ranges, the bounds include the beginning of the [PERIOD_START] (i.e. 00:00:00) and the end of the [PERIOD_END] (i.e. 23:59:59).
562 562  
563 -**Examples: **
508 +**Examples:**
564 564  
565 565  **2010-Q2, REPORTING_YEAR_START_DAY = ~-~-07-01 (July 1)**
566 -
567 567  ~1. [REPORTING_YEAR_START_DATE] = 2010-07-01
568 -
569 569  b) [REPORTING_YEAR_BASE] = 2010-07-01
570 -
571 -1. [PERIOD_DURATION] = P3M
572 -1. (2-1) * P3M = P3M
573 -
513 +[PERIOD_DURATION] = P3M
514 +(2-1) * P3M = P3M
574 574  2010-07-01 + P3M = 2010-10-01
575 -
576 576  [PERIOD_START] = 2010-10-01
577 -
578 578  4. 2 * P3M = P6M
579 -
580 580  2010-07-01 + P6M = 2010-13-01 = 2011-01-01
581 -
582 582  2011-01-01 + -P1D = 2010-12-31
583 -
584 584  [PERIOD_END] = 2011-12-31
585 585  
586 586  The actual calendar range covered by 2010-Q2 (assuming the reporting year begins July 1) is 2010-10-01T00:00:00/2010-12-31T23:59:59
587 587  
588 588  **2011-W36, REPORTING_YEAR_START_DAY = ~-~-07-01 (July 1)**
589 -
590 590  ~1. [REPORTING_YEAR_START_DATE] = 2010-07-01
591 -
592 592  a) 2011-07-01 = Friday
593 -
594 594  2011-07-01 + P3D = 2011-07-04
595 -
596 596  [REPORTING_YEAR_BASE] = 2011-07-04
597 -
598 -1. [PERIOD_DURATION] = P7D
599 -1. (36-1) * P7D = P245D
600 -
529 +2. [PERIOD_DURATION] = P7D
530 +3. (36-1) * P7D = P245D
601 601  2011-07-04 + P245D = 2012-03-05
602 -
603 603  [PERIOD_START] = 2012-03-05
604 -
605 605  4. 36 * P7D = P252D
606 -
607 607  2011-07-04 + P252D =2012-03-12
608 -
609 609  2012-03-12 + -P1D = 2012-03-11
610 -
611 611  [PERIOD_END] = 2012-03-11
612 612  
613 613  The actual calendar range covered by 2011-W36 (assuming the reporting year begins July 1) is 2012-03-05T00:00:00/2012-03-11T23:59:59
614 614  
615 -==== 4.2.7 Distinct Range ====
540 +=== 4.2.7 Distinct Range ===
616 616  
617 617  In the case that the reporting period does not fit into one of the prescribe periods above, a distinct time range can be used. The value of these ranges is based on the ISO 8601 time interval format of start/duration. Start can be expressed as either an ISO 8601 date or a date-time, and duration is expressed as an ISO 8601 duration. However, the duration can only be postive.
618 618  
619 -==== 4.2.8 Time Format ====
544 +=== 4.2.8 Time Format ===
620 620  
621 -In version 2.0 of SDMX there is a recommendation to use the time format attribute to gives additional information on the way time is represented in the message. Following an appraisal of its usefulness this is no longer required. However, it is still possible, if required , to include the time format attribute in SDMX-ML. 
546 +In (% style="color:#e74c3c" %)version(%%) 2.0 of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] there is a recommendation to use the [[time format>>doc:sdmx:Glossary.Time format.WebHome]] [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] to gives additional information on the way time is represented in the message. Following an appraisal of its usefulness this is no longer required. However, it is still possible, if required , to include the [[time format>>doc:sdmx:Glossary.Time format.WebHome]] [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]].
622 622  
623 -|**Code**|**Format**
624 -|**OTP**|Observational Time Period: Superset of all SDMX time formats (Gregorian Time Period, Reporting Time Period, and Time Range)
625 -|**STP**|Standard Time Period: Superset of Gregorian and Reporting Time Periods
626 -|**GTP**|Superset of all Gregorian Time Periods and date-time
627 -|**RTP**|Superset of all Reporting Time Periods
628 -|**TR**|Time Range: Start time and duration (YYYY-MMDD(Thh:mm:ss)?/<duration>)
629 -|**GY**|Gregorian Year (YYYY)
630 -|**GTM**|Gregorian Year Month (YYYY-MM)
631 -|**GD**|Gregorian Day (YYYY-MM-DD)
632 -|**DT**|Distinct Point: date-time (YYYY-MM-DDThh:mm:ss)
633 -|**RY**|Reporting Year (YYYY-A1)
634 -|**RS**|Reporting Semester (YYYY-Ss)
635 -|**RT**|Reporting Trimester (YYYY-Tt)
636 -|**RQ**|Reporting Quarter (YYYY-Qq)
637 -|**RM**|Reporting Month (YYYY-Mmm)
638 -|**Code**|**Format**
639 -|**RW**|Reporting Week (YYYY-Www)
640 -|**RD**|Reporting Day (YYYY-Dddd)
548 +(% style="width:716.835px" %)
549 +|(% style="width:197px" %)**Code**|(% style="width:517px" %)**Format**
550 +|(% style="width:197px" %)**OTP**|(% style="width:517px" %)Observational [[Time Period>>doc:sdmx:Glossary.Time period.WebHome]]: Superset of all [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[time formats>>doc:sdmx:Glossary.Time format.WebHome]] (Gregorian [[Time Period>>doc:sdmx:Glossary.Time period.WebHome]], Reporting [[Time Period>>doc:sdmx:Glossary.Time period.WebHome]], and Time Range)
551 +|(% style="width:197px" %)**STP**|(% style="width:517px" %)Standard [[Time Period>>doc:sdmx:Glossary.Time period.WebHome]]: Superset of Gregorian and Reporting [[Time Periods>>doc:sdmx:Glossary.Time period.WebHome]]
552 +|(% style="width:197px" %)**GTP**|(% style="width:517px" %)Superset of all Gregorian [[Time Periods>>doc:sdmx:Glossary.Time period.WebHome]] and date-time
553 +|(% style="width:197px" %)**RTP**|(% style="width:517px" %)Superset of all Reporting [[Time Periods>>doc:sdmx:Glossary.Time period.WebHome]]
554 +|(% style="width:197px" %)**TR**|(% style="width:517px" %)Time Range: Start time and duration (YYYY-MMDD(Thh:mm:ss)?/)
555 +|(% style="width:197px" %)**GY**|(% style="width:517px" %)Gregorian Year (YYYY)
556 +|(% style="width:197px" %)**GTM**|(% style="width:517px" %)Gregorian Year Month (YYYY-MM)
557 +|(% style="width:197px" %)**GD**|(% style="width:517px" %)Gregorian Day (YYYY-MM-DD)
558 +|(% style="width:197px" %)**DT**|(% style="width:517px" %)Distinct Point: date-time (YYYY-MM-DDThh:mm:ss)
559 +|(% style="width:197px" %)**RY**|(% style="width:517px" %)Reporting Year (YYYY-A1)
560 +|(% style="width:197px" %)**RS**|(% style="width:517px" %)Reporting Semester (YYYY-Ss)
561 +|(% style="width:197px" %)**RT**|(% style="width:517px" %)Reporting Trimester (YYYY-Tt)
562 +|(% style="width:197px" %)**RQ**|(% style="width:517px" %)Reporting Quarter (YYYY-Qq)
563 +|(% style="width:197px" %)**RM**|(% style="width:517px" %)Reporting Month (YYYY-Mmm)
564 +|(% style="width:197px" %)**[[Code>>doc:sdmx:Glossary.Code.WebHome]]**|(% style="width:517px" %)**Format**
565 +|(% style="width:197px" %)**RW**|(% style="width:517px" %)Reporting Week (YYYY-Www)
566 +|(% style="width:197px" %)**RD**|(% style="width:517px" %)Reporting Day (YYYY-Dddd)
641 641  
642 - **Table 1: SDMX-ML Time Format Codes**
568 +**Table 1: SDMX-ML Time Format Codes**
643 643  
644 -==== 4.2.9 Transformation between SDMX-ML and SDMX-EDI ====
570 +=== 4.2.9 Transformation between SDMX-ML and SDMX-EDI ===
645 645  
646 -When converting SDMX-ML data structure definitions to SDMX-EDI data structure definitions, only the identifier of the time format attribute will be retained. The representation of the attribute will be converted from the SDMX-ML format to the fixed SDMX-EDI code list. If the SDMX-ML data structure definition does not define a time format attribute, then one will be automatically created with the identifier "TIME_FORMAT".
572 +When converting [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] [[data structure definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] to [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] [[data structure definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]], only the identifier of the [[time format>>doc:sdmx:Glossary.Time format.WebHome]] [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] will be retained. The [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] will be converted from the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] format to the fixed [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] [[code list>>doc:sdmx:Glossary.Code list.WebHome]]. If the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] does not define a [[time format>>doc:sdmx:Glossary.Time format.WebHome]] [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]], then one will be automatically created with the identifier "TIME_FORMAT".
647 647  
648 -When converting SDMX-ML data to SDMX-EDI, the source time format attribute will be irrelevant. Since the SDMX-ML time representation types are not ambiguous, the target time format can be determined from the source time value directly. For example, if the SDMX-ML time is 2000-Q2 the SDMX-EDI format will always be 608/708 (depending on whether the target series contains one observation or a range of observations)
574 +When converting [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] data to [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]], the source [[time format>>doc:sdmx:Glossary.Time format.WebHome]] [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] will be irrelevant. Since the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] time [[representation>>doc:sdmx:Glossary.Representation.WebHome]] types are not ambiguous, the target [[time format>>doc:sdmx:Glossary.Time format.WebHome]] can be determined from the source time value directly. For example, if the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] time is 2000-Q2 the [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] format will always be 608/708 (depending on whether the target series contains one observation or a range of observations).
649 649  
650 -When converting a data structure definition originating in SDMX-EDI, the time format attribute should be ignored, as it serves no purpose in SDMX-ML.
576 +When converting a [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] originating in [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]], the [[time format>>doc:sdmx:Glossary.Time format.WebHome]] [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] should be ignored, as it serves no purpose in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]].
651 651  
652 -When converting data from SDMX-EDI to SDMX-ML, the source time format is only necessary to determine the format of the target time value. For example, a source time format of will result in a target time in the format YYYY-Ss whereas a source format of will result in a target time value in the format YYYY-Qq.
578 +When converting data from [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] to [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]], the source [[time format>>doc:sdmx:Glossary.Time format.WebHome]] is only necessary to determine the format of the target time value. For example, a source [[time format>>doc:sdmx:Glossary.Time format.WebHome]] of will result in a target time in the format YYYY-Ss whereas a source format of will result in a target time value in the format YYYY-Qq.
653 653  
654 -==== 4.2.10 Time Zones ====
580 +=== 4.2.10 Time Zones ===
655 655  
656 -In alignment with ISO 8601, SDMX allows the specification of a time zone on all time periods and on the reporting year start day. If a time zone is provided on a reporting year start day, then the same time zone (or none) should be reported for each reporting time period. If the reporting year start day and the reporting period time zone differ, the time zone of the reporting period will take precedence. Examples of each format with time zones are as follows (time zone indicated in bold):
582 +In alignment with ISO 8601, [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] allows the specification of a time zone on all [[time periods>>doc:sdmx:Glossary.Time period.WebHome]] and on the reporting year start day. If a time zone is provided on a reporting year start day, then the same time zone (or none) should be reported for each reporting [[time period>>doc:sdmx:Glossary.Time period.WebHome]]. If the reporting year start day and the reporting period time zone differ, the time zone of the reporting period will take precedence. Examples of each format with time zones are as follows (time zone indicated in bold):
657 657  
658 658  * Time Range (start date): 2006-06-05**-05:00**/P5D
659 659  * Time Range (start date-time): 2006-06-05T00:00:00**-05:00**/P5D
... ... @@ -668,59 +668,56 @@
668 668  * Reporting Month: 2006-M06**-05:00**
669 669  * Reporting Week: 2006-W23**-05:00**
670 670  * Reporting Day: 2006-D156**-05:00**
671 -* Reporting Year Start Day: ~-~-07-01**-05:00**
597 +* Reporting Year Start Day: 07-01**-05:00**
672 672  
673 -According to ISO 8601, a date without a time-zone is considered "local time". SDMX assumes that local time is that of the sender of the message. In this version of SDMX, an optional field is added to the sender definition in the header for specifying a time zone. This field has a default value of 'Z' (UTC). This determination of local time applies for all dates in a message.
599 +According to ISO 8601, a date without a time-zone is considered "local time". [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] assumes that local time is that of the sender of the message. In this (% style="color:#e74c3c" %)version(%%) of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], an optional field is added to the sender definition in the header for specifying a time zone. This field has a default value of 'Z' (UTC). This determination of local time applies for all dates in a message.
674 674  
675 -==== 4.2.11 Representing Time Spans Elsewhere ====
601 +=== 4.2.11 Representing Time Spans Elsewhere ===
676 676  
677 -It has been possible since SDMX 2.0 for a Component to specify a representation of a time span. Depending on the format of the data message, this resulted in either an element with 2 XML attributes for holding the start time and the duration or two separate XML attributes based on the underlying Component identifier. For example if REF_PERIOD were given a representation of time span, then in the Compact data format, it would be represented by two XML attributes; REF_PERIODStartTime (holding the start) and REF_PERIOD (holding the duration). If a new simple type is introduced in the SDMX schemas that can hold ISO 8601 time intervals, then this will no longer be necessary. What was represented as this:
603 +It has been possible since [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.0 for a [[Component>>doc:sdmx:Glossary.Component.WebHome]] to specify a [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of a time span. Depending on the format of the data message, this resulted in either an element with 2 XML [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] for holding the start time and the duration or two separate XML [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] based on the underlying [[Component>>doc:sdmx:Glossary.Component.WebHome]] identifier. For example if REF_PERIOD were given a [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of time span, then in the Compact data format, it would be represented by two XML [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]; REF_PERIODStartTime (holding the start) and REF_PERIOD (holding the duration). If a new simple type is introduced in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] schemas that can hold ISO 8601 time intervals, then this will no longer be necessary. What was represented as this:
678 678  
679 - <Series REF_PERIODStartTime="2000-01-01T00:00:00" REF_PERIOD="P2M"/>
605 +<Series REF_PERIODStartTime="2000-01-01T00:00:00" REF_PERIOD="P2M"/>
680 680  
681 681  can now be represented with this:
682 682  
683 683  <Series REF_PERIOD="2000-01-01T00:00:00/P2M"/>
684 684  
685 -==== 4.2.12 Notes on Formats ====
611 +=== 4.2.12 Notes on Formats ===
686 686  
687 -There is no ambiguity in these formats so that for any given value of time, the category of the period (and thus the intended time period range) is always clear. It should also be noted that by utilizing the ISO 8601 format, and a format loosely based on it for the report periods, the values of time can easily be sorted chronologically without additional parsing.
613 +There is no ambiguity in these formats so that for any given value of time, the [[category>>doc:sdmx:Glossary.Category.WebHome]] of the period (and thus the intended [[time period>>doc:sdmx:Glossary.Time period.WebHome]] range) is always clear. It should also be noted that by utilizing the ISO 8601 format, and a format loosely based on it for the report periods, the values of time can easily be sorted chronologically without additional parsing.
688 688  
689 -==== 4.2.13 Effect on Time Ranges ====
615 +=== 4.2.13 Effect on Time Ranges ===
690 690  
691 -All SDMX-ML data messages are capable of functioning in a manner similar to SDMX-EDI if the Dimension at the observation level is time: the time period for the first observation can be stated and the rest of the observations can omit the time value as it can be derived from the start time and the frequency. Since the frequency can be determined based on the actual format of the time value for everything but distinct points in time and time ranges, this makes is even simpler to process as the interval between time ranges is known directly from the time value.
617 +All [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] data messages are capable of functioning in a manner similar to [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]] if the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] at the observation (% style="color:#e74c3c" %)level(%%) is time: the [[time period>>doc:sdmx:Glossary.Time period.WebHome]] for the first observation can be stated and the rest of the observations can omit the time value as it can be derived from the start time and the frequency. Since the frequency can be determined based on the actual format of the time value for everything but distinct points in time and time ranges, this makes is even simpler to process as the interval between time ranges is known directly from the time value.
692 692  
693 -==== 4.2.14 Time in Query Messages ====
619 +=== 4.2.14 Time in Query Messages ===
694 694  
695 -When querying for time values, the value of a time parameter can be provided as any of the Observational Time Period formats and must be paired with an operator. In addition, an explicit value for the reporting year start day can be provided, or this can be set to "Any". This section will detail how systems processing query messages should interpret these parameters.
621 +When querying for time values, the value of a time parameter can be provided as any of the Observational [[Time Period>>doc:sdmx:Glossary.Time period.WebHome]] formats and must be paired with an operator. In addition, an explicit value for the reporting year start day can be provided, or this can be set to "Any". This section will detail how systems processing query messages should interpret these parameters.
696 696  
697 -Fundamental to processing a time value parameter in a query message is understanding that all time periods should be handled as a distinct range of time. Since the time parameter in the query is paired with an operator, this is also effectively represents a distinct range of time. Therefore, a system processing the query must simply match the data where the time period for requested parameter is encompassed by the time period resulting from value of the query parameter. The following table details how the operators should be interpreted for any time period provided as a parameter.
623 +Fundamental to processing a time value parameter in a query message is understanding that all [[time periods>>doc:sdmx:Glossary.Time period.WebHome]] should be handled as a distinct range of time. Since the time parameter in the query is paired with an operator, this is also effectively represents a distinct range of time. Therefore, a system processing the query must simply match the data where the [[time period>>doc:sdmx:Glossary.Time period.WebHome]] for requested parameter is encompassed by the [[time period>>doc:sdmx:Glossary.Time period.WebHome]] resulting from value of the query parameter. The following table details how the operators should be interpreted for any [[time period>>doc:sdmx:Glossary.Time period.WebHome]] provided as a parameter.
698 698  
699 -|**Operator**|**Rule**
700 -|Greater Than|Any data after the last moment of the period
701 -|Less Than|Any data before the first moment of the period
702 -|Greater Than or Equal To|(((
703 -Any data on or after the first moment of
704 -
705 -the period
625 +(% style="width:1024.29px" %)
626 +|(% style="width:238px" %)**Operator**|(% style="width:782px" %)**Rule**
627 +|(% style="width:238px" %)Greater Than|(% style="width:782px" %)Any data after the last moment of the period
628 +|(% style="width:238px" %)Less Than|(% style="width:782px" %)Any data before the first moment of the period
629 +|(% style="width:238px" %)Greater Than or Equal To|(% style="width:782px" %)(((
630 +Any data on or after the first moment of the period
706 706  )))
707 -|Less Than or Equal To|Any data on or before the last moment of the period
708 -|Equal To|Any data which falls on or after the first moment of the period and before or on the last moment of the period
632 +|(% style="width:238px" %)Less Than or Equal To|(% style="width:782px" %)Any data on or before the last moment of the period
633 +|(% style="width:238px" %)Equal To|(% style="width:782px" %)Any data which falls on or after the first moment of the period and before or on the last moment of the period
709 709  
710 -Reporting Time Periods as query parameters are handled based on whether the value of the reportingYearStartDay XML attribute is an explicit month and day or "Any":
635 +Reporting [[Time Periods>>doc:sdmx:Glossary.Time period.WebHome]] as query parameters are handled based on whether the value of the reportingYearStartDay XML [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is an explicit month and day or "Any":
711 711  
712 -If the time parameter provides an explicit month and day value for the reportingYearStartDay XML attribute, then the parameter value is converted to a distinct range and processed as any other time period would be processed.
637 +If the time parameter provides an explicit month and day value for the reportingYearStartDay XML [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]], then the parameter value is converted to a distinct range and processed as any other [[time period>>doc:sdmx:Glossary.Time period.WebHome]] would be processed.
713 713  
714 -If the reportingYeartStartDay XML attribute has a value of "Any", then any data within the bounds of the reporting period for the year is matched, regardless of the actual start day of the reporting year. In addition, data reported against a normal calendar period is matched if it falls within the bounds of the time parameter based on a reporting year start day of January 1. When determining whether another reporting period falls within the bounds of a report period query parameter, one will have to take into account the actual time period to compare weeks and days to higher order report periods. This will be demonstrated in the examples to follow.
639 +If the reportingYeartStartDay XML [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] has a value of "Any", then any data within the bounds of the reporting period for the year is matched, regardless of the actual start day of the reporting year. In addition, data reported against a normal calendar period is matched if it falls within the bounds of the time parameter based on a reporting year start day of January 1. When determining whether another reporting period falls within the bounds of a report period query parameter, one will have to take into account the actual [[time period>>doc:sdmx:Glossary.Time period.WebHome]] to compare weeks and days to higher order report periods. This will be demonstrated in the examples to follow.
715 715  
716 -Note that the reportingYearStartDay XML attribute on the time value parameter is only used to qualify a reporting period value for the given time value parameter. The usage of this is different than using the attribute value parameter for the actual reporting year start day attribute. In the case that the attribute value parameters is used for the reporting year start day data structure attribute, it will be treated as any other attribute value parameter; data will be filtered to that which matches the values specified for the given attribute. For example, if the attribute value parameter references the reporting year start day attribute and specifies a value of "~-~-07-01", then only data which has this attribute with the value "~-~-07-01" will be returned. In terms of processing any time value parameters, the value supplied in the attribute value parameter will be irrelevant.
641 +Note that the reportingYearStartDay XML [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] on the time value parameter is only used to qualify a reporting period value for the given time value parameter. The usage of this is different than using the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value parameter for the actual reporting year start day [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]. In the case that the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value parameters is used for the reporting year start day data structure [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]], it will be treated as any other [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value parameter; data will be filtered to that which matches the values specified for the given [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]. For example, if the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value parameter references the reporting year start day [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] and specifies a value of "07-01", then only data which has this [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] with the value "07-01" will be returned. In terms of processing any time value parameters, the value supplied in the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value parameter will be irrelevant.
717 717  
718 718  **Examples:**
719 719  
720 720  **Gregorian Period**
721 -
722 722  Query Parameter: Greater than 2010
723 -
724 724  Literal Interpretation: Any data where the start period occurs after 2010-1231T23:59:59.
725 725  
726 726  Example Matches:
... ... @@ -740,13 +740,10 @@
740 740  **Reporting Period with explicit start day**
741 741  
742 742  Query Parameter: Greater than or equal to 2009-Q3, reporting year start day = "-07-01"
743 -
744 744  Literal Interpretation: Any data where the start period occurs on after 2010-0101T00:00:00 (Note that in this case 2009-Q3 is converted to the explicit date range of 2010-01-01/2010-03-31 because of the reporting year start day value). Example Matches: Same as previous example
745 745  
746 746  **Reporting Period with "Any" start day**
747 -
748 748  Query Parameter: Greater than or equal to 2010-Q3, reporting year start day = "Any"
749 -
750 750  Literal Interpretation: Any data with a reporting period where the start period is on or after the start period of 2010-Q3 for the same reporting year start day, or and data where the start period is on or after 2010-07-01. Example Matches:
751 751  
752 752  * 2011 or later
... ... @@ -758,62 +758,58 @@
758 758  * 2010-T3 (any reporting year start day)
759 759  * 2010-Q3 or later (any reporting year start day)
760 760  * 2010-M07 or later (any reporting year start day)
761 -* 2010-W27 or later (reporting year start day ~-~-01-01)^^4^^  2010-D182 or later (reporting year start day ~-~-01-01)
762 -* 2010-W28 or later (reporting year start day ~-~-07-01)^^5^^
681 +* 2010-W27 or later (reporting year start day ~-~-01-01){{footnote}}2010-Q3 (with a reporting year start day of --01-01) starts on 2010-07-01. This is day 4 of week 26, therefore the first week matched is week 27.{{/footnote}}
682 +* 2010-D182 or later (reporting year start day ~-~-01-01)
683 +* 2010-W28 or later (reporting year start day ~-~-07-01){{footnote}}2010-Q3 (with a reporting year start day of --07-01) starts on 2011-01-01. This is day 6 of week 27, therefore the first week matched is week 28.{{/footnote}}
684 +* 2010-D185 or later (reporting year start day ~-~-07-01)
763 763  
764 -^^4^^ 2010-Q3 (with a reporting year start day of ~-~-01-01) starts on 2010-07-01. This is day 4 of week 26, therefore the first week matched is week 27.
686 +== 4.3 Structural Metadata Querying Best Practices ==
765 765  
766 - 2010-D185 or later (reporting year start day ~-~-07-01)
688 +When querying for [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]], the ability to state how references should be resolved is quite powerful. However, this mechanism is not always necessary and can create an undue burden on the systems processing the queries if it is not used properly.
767 767  
768 -== 4.3 Structural Metadata Querying Best Practices ==
690 +Any [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]] object which contains a reference to an object can be queried based on that reference. For example, a categorisation references both a [[category>>doc:sdmx:Glossary.Category.WebHome]] and the object is it categorising. As this is the case, one can query for categorisations which categorise a particular object or which categorise against a particular [[category>>doc:sdmx:Glossary.Category.WebHome]] or [[category scheme>>doc:sdmx:Glossary.Category scheme.WebHome]]. This mechanism should be used when the referenced object is known.
769 769  
770 -When querying for structural metadata, the ability to state how references should be resolved is quite powerful. However, this mechanism is not always necessary and can create an undue burden on the systems processing the queries if it is not used properly.
692 +When the referenced object is not known, then the reference resolution mechanism could be used. For example, suppose one wanted to find all [[category schemes>>doc:sdmx:Glossary.Category scheme.WebHome]] and the related categorisations for a given [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]]. In this case, one could query for the [[category scheme>>doc:sdmx:Glossary.Category scheme.WebHome]] by the [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]] and specify that parent and sibling references should be resolved. This would result in the categorisations which reference the [[categories>>doc:sdmx:Glossary.Category.WebHome]] in the matched schemes to be returned, as well as the object which they categorise.
771 771  
772 -Any structural metadata object which contains a reference to an object can be queried based on that reference. For example, a categorisation references both a category and the object is it categorising. As this is the case, one can query for categorisations which categorise a particular object or which categorise against a particular category or category scheme. This mechanism should be used when the referenced object is known.
694 +== 4.4 Versioning and External Referencing ==
773 773  
774 -When the referenced object is not known, then the reference resolution mechanism could be used. For example, suppose one wanted to find all category schemes and the related categorisations for a given maintenance agency. In this case, one could query for the category scheme by the maintenance agency and specify that parent and sibling references should be resolved. This would result in the categorisations which reference the categories in the matched schemes to be returned, as well as the object which they categorise.
696 +Within the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] Structure Message, there is a pattern for versioning and external referencing which should be pointed out. The identifiers are qualified by their (% style="color:#e74c3c" %)version(%%) numbers – that is, an object with an Agency of “A”, and ID of “X” and a (% style="color:#e74c3c" %)version(%%) of “1.0” is a different object than one with an Agency of “A’, an ID of “X”, and a (% style="color:#e74c3c" %)version(%%) of “1.1”.
775 775  
776 -== 4.4 Versioning and External Referencing ==
698 +The production (% style="color:#e74c3c" %)versions(%%) of identifiable objects/resources are assumed to be static – that is, they have their isFinal [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] set to ‘true”. Once in production, and object cannot change in any way, or it must be versioned. For cases where an object is not static, the isFinal [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] must have a value of “false”, but non-final objects should not be used outside of a specific system designed to accommodate them. For most purposes, all objects should be declared final before use in production.
777 777  
778 -Within the SDMX-ML Structure Message, there is a pattern for versioning and external referencing which should be pointed out. The identifiers are qualified by their version numbers – that is, an object with an Agency of “A”, and ID of “X” and a version of “1.0” is a different object than one with an Agency of “A’, an ID of “X”, and a version of “1.1”.
700 +This mechanism is an “early binding” one – everything with a versioned identity is a known quantity, and will not change. It is worth pointing out that in some cases relationships are essentially one-way references: an illustrative case is that of [[Categories>>doc:sdmx:Glossary.Category.WebHome]]. While a [[Category>>doc:sdmx:Glossary.Category.WebHome]] may be referenced by many [[dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] and [[metadata flows>>doc:sdmx:Glossary.Metadataflow.WebHome]], the addition of more references from flow objects does not (% style="color:#e74c3c" %)version(%%) the [[Category>>doc:sdmx:Glossary.Category.WebHome]]. This is because the flows are not properties of the [[Categories>>doc:sdmx:Glossary.Category.WebHome]] – they merely make references to it. If the name of a [[Category>>doc:sdmx:Glossary.Category.WebHome]] changed, or its subCategories changed, then versioning would be necessary.
779 779  
780 -The production versions of identifiable objects/resources are assumed to be static – that is, they have their isFinal attribute set to ‘true”. Once in production, and object cannot change in any way, or it must be versioned. For cases where an object is not static, the isFinal attribute must have a value of “false”, but non-final objects should not be used outside of a specific system designed to accommodate them. For most purposes, all objects should be declared final before use in production.
702 +Versioning operates at the (% style="color:#e74c3c" %)level(%%) of versionable and maintainable objects in the [[SDMX information model>>doc:sdmx:Glossary.SDMX Information Model.WebHome]]. If any of the children of objects at these (% style="color:#e74c3c" %)levels(%%) change, then the objects themselves are versioned.
781 781  
782 -This mechanism is an “early binding” one – everything with a versioned identity is a known quantity, and will not change. It is worth pointing out that in some cases relationships are essentially one-way references: an illustrative case is that of Categories. While a Category may be referenced by many dataflows and metadata flows, the addition of more references from flow objects does not version the Category. This is because the flows are not properties of the Categories – they merely make references to it. If the name of a Category changed, or its subCategories changed, then versioning would be necessary.
704 +One area which is much impacted by this versioning scheme is the ability to reference external objects. With the many dependencies within the various structural objects in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], it is useful to have a scheme for external referencing. This is done at the (% style="color:#e74c3c" %)level(%%) of maintainable objects (DSDs, [[code lists>>doc:sdmx:Glossary.Code list.WebHome]], [[concept schemes>>doc:sdmx:Glossary.Concept scheme.WebHome]], etc.) In an [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] Structure Message, whenever an “[[isExternalReference>>doc:sdmx:Glossary.isExternalReference.WebHome]]” [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is set to true, then the application must resolve the address provided in the associated “uri” [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] and use the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] Structure Message stored at that location for the full definition of the object in question. Alternately, if a registry “urn” [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] has been provided, the registry can be used to supply the full details of the object.
783 783  
784 -^^5^^ 2010-Q3 (with a reporting year start day of ~-~-07-01) starts on 2011-01-01. This is day 6 of week 27, therefore the first week matched is week 28.
706 +Because the (% style="color:#e74c3c" %)version(%%) number is part of the identifier for an object, (% style="color:#e74c3c" %)versions(%%) are a necessary part of determining that a given resource is the one which was called for. It should be noted that whenever a (% style="color:#e74c3c" %)version(%%) number is not supplied, it is assumed to be “1.0”. (The “x.x” versioning notation is conventional in practice with [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], but not required.)
785 785  
786 -Versioning operates at the level of versionable and maintainable objects in the SDMX information model. If any of the children of objects at these levels change, then the objects themselves are versioned.
787 -
788 -One area which is much impacted by this versioning scheme is the ability to reference external objects. With the many dependencies within the various structural objects in SDMX, it is useful to have a scheme for external referencing. This is done at the level of maintainable objects (DSDs, code lists, concept schemes, etc.) In an SDMX-ML Structure Message, whenever an “isExternalReference” attribute is set to true, then the application must resolve the address provided in the associated “uri” attribute and use the SDMX-ML Structure Message stored at that location for the full definition of the object in question. Alternately, if a registry “urn” attribute has been provided, the registry can be used to supply the full details of the object.
789 -
790 -Because the version number is part of the identifier for an object, versions are a necessary part of determining that a given resource is the one which was called for. It should be noted that whenever a version number is not supplied, it is assumed to be “1.0”. (The “x.x” versioning notation is conventional in practice with SDMX, but not required.)
791 -
792 792  = 5 Metadata Structure Definition (MSD) =
793 793  
794 794  == 5.1 Scope ==
795 795  
796 -The scope of the MSD is enhanced in this version to better support the types of construct to which metadata can be attached. In particular it is possible to specify an attachment to any key or partial key of a data set. This is particularly useful for web dissemination where metadata may be present for the data, but is not stored with the data but is related to it. For this use case to be supported it is necessary to be able to specify in the MSD that metadata is attached to a key or partial key, and the actual key or partial key to be identified in the Metadata Set.
712 +The scope of the [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] is enhanced in this (% style="color:#e74c3c" %)version(%%) to better support the types of construct to which metadata can be attached. In particular it is possible to specify an attachment to any key or partial key of a [[data set>>doc:sdmx:Glossary.Data set.WebHome]]. This is particularly useful for web dissemination where metadata may be present for the data, but is not stored with the data but is related to it. For this use case to be supported it is necessary to be able to specify in the [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] that metadata is attached to a key or partial key, and the actual key or partial key to be identified in the [[Metadata Set>>doc:sdmx:Glossary.Metadata set.WebHome]].
797 797  
798 -In addition to the increase in the scope of objects that can be included in an MSD, the way the identifier mechanism works in this version, and the terminology used, is much simpler.
714 +In addition to the increase in the scope of objects that can be included in an [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]], the way the identifier mechanism works in this (% style="color:#e74c3c" %)version(%%), and the terminology used, is much simpler.
799 799  
800 800  == 5.2 Identification of the Object Type to which the Metadata is to be Attached ==
801 801  
802 -The following example shows the structure and naming of the MSD components for the use case of defining full and partial keys.
718 +The following example shows the structure and naming of the [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] [[components>>doc:sdmx:Glossary.Component.WebHome]] for the use case of defining full and partial keys.
803 803  
804 -The schematic structure of an MSD is shown below.
720 +The schematic structure of an [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] is shown below.
805 805  
806 806  [[image:1747836776649-282.jpeg]]
807 807  
808 -1. **1: Schematic of the Metadata Structure Definition**
724 +**Figure 1: Schematic of the Metadata Structure Definition**
809 809  
810 -The MSD comprises the specification of the object types to which metadata can be reported in a Metadata Set (Metadata Target(s)), and the Report Structure(s) comprising the Metadata Attributes that identify the Concept for which metadata may be reported in the Metadata Set. Importantly, one Report Structure references the Metadata Target for which it is relevant. One Report Structure can reference many Metadata Target i.e. the same Report Structure can be used for different target objects.
726 +The [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] comprises the specification of the object types to which metadata can be reported in a [[Metadata Set>>doc:sdmx:Glossary.Metadata set.WebHome]] (Metadata Target(s)), and the Report Structure(s) comprising the Metadata [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] that identify the (% style="color:#e74c3c" %)Concept(%%) for which metadata may be reported in the [[Metadata Set>>doc:sdmx:Glossary.Metadata set.WebHome]]. Importantly, one Report Structure references the Metadata Target for which it is relevant. One Report Structure can reference many Metadata Target i.e. the same Report Structure can be used for different target objects.
811 811  
812 812  [[image:1747836776655-364.jpeg]]
813 813  
814 -1. **2: Example MSD showing Metadata Targets**
730 +**Figure 2: Example [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] showing Metadata Targets**
815 815  
816 -Note that the SDMX-ML schemas have explicit XML elements for each identifiable object type because identifying, for instance, a Maintainable Object has different properties from an Identifiable Object which must also include the agencyId, version, and id of the Maintainable Object in which it resides.
732 +Note that the [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] schemas have explicit XML elements for each identifiable object type because identifying, for instance, a Maintainable Object has different properties from an Identifiable Object which must also include the agencyId, (% style="color:#e74c3c" %)version(%%), and id of the Maintainable Object in which it resides.
817 817  
818 818  == 5.3 Report Structure ==
819 819  
... ... @@ -821,38 +821,37 @@
821 821  
822 822  [[image:1747836776658-510.jpeg]]
823 823  
824 -**Figure 3: Example MSD showing specification of three Metadata Attributes **This example shows the following hierarchy of Metadata Attributes:
740 +**Figure 3: Example MSD showing specification of three Metadata Attributes**
825 825  
826 -Source – this is presentational and no metadata is expected to be reported at this level
742 +This example shows the following [[hierarchy>>doc:sdmx:Glossary.Hierarchy.WebHome]] of Metadata [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]]:
827 827  
744 +Source – this is presentational and no metadata is expected to be reported at this (% style="color:#e74c3c" %)level
745 +
828 828  * Source Type
829 829  * Collection Source Name
830 830  
831 831  == 5.4 Metadata Set ==
832 832  
833 -An example of reporting metadata according to the MSD described above, is shown below.
751 +An example of reporting metadata according to the [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] described above, is shown below.
834 834  
835 835  [[image:1747836776677-246.jpeg]]
836 836  
837 - **Figure 4: Example Metadata Set **This example shows:
755 +**Figure 4: Example Metadata Set **This example shows:
838 838  
839 -1. The reference to the MSD, Metadata Report, and Metadata Target
757 +1. The reference to the [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]], Metadata Report, and Metadata Target (MetadataTargetValue)
758 +1. The reported metadata [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] (AttributeValueSet)
840 840  
841 -(MetadataTargetValue)
842 -
843 -1. The reported metadata attributes (AttributeValueSet)
844 -
845 845  = 6 Maintenance Agencies =
846 846  
847 -All structural metadata in SDMX is owned and maintained by a maintenance agency (Agency identified by agencyID in the schemas). It is vital to the integrity of the structural metadata that there are no conflicts in agencyID. In order to achieve this SDMX adopts the following rules:
762 +All [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]] in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is owned and maintained by a [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]] (Agency identified by agencyID in the schemas). It is vital to the integrity of the [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]] that there are no conflicts in agencyID. In order to achieve this [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] adopts the following rules:
848 848  
849 -1. Agencies are maintained in an Agency Scheme (which is a sub class of Organisation Scheme)
850 -1. The maintenance agency of the Agency Scheme must also be declared in a (different) Agency Scheme.
851 -1. The “top-level” agency is SDMX and this agency scheme is maintained by SDMX.
852 -1. Agencies registered in the top-level scheme can themselves maintain a single Agency Scheme. SDMX is an agency in the SDMX agency scheme. Agencies in this scheme can themselves maintain a single Agency Scheme and so on.
853 -1. The AgencyScheme cannot be versioned and so take a default version number of 1.0 and cannot be made “final”.
764 +1. Agencies are maintained in an [[Agency Scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]] (which is a sub class of Organisation Scheme)
765 +1. The [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]] of the [[Agency Scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]] must also be declared in a (different) [[Agency Scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]].
766 +1. The “top-(% style="color:#e74c3c" %)level(%%)” agency is [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] and this [[agency scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]] is maintained by [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].
767 +1. Agencies registered in the top-(% style="color:#e74c3c" %)level(%%) scheme can themselves maintain a single [[Agency Scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]]. [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is an agency in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[agency scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]]. Agencies in this scheme can themselves maintain a single [[Agency Scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]] and so on.
768 +1. The AgencyScheme cannot be versioned and so take a default (% style="color:#e74c3c" %)version(%%) number of 1.0 and cannot be made “final”.
854 854  1. There can be only one AgencyScheme maintained by any one Agency. It has a fixed Id of AgencyScheme.
855 -1. The format of the agency identifier is agencyId.agencyID etc. The top-level agency in this identification mechanism is the agency registered in the SDMX agency scheme. In other words, SDMX is not a part of the hierarchical ID structure for agencies. SDMX is, itself, a maintenance agency.
770 +1. The format of the agency identifier is agencyId.agencyID etc. The top-(% style="color:#e74c3c" %)level(%%) agency in this identification mechanism is the agency registered in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[agency scheme>>doc:sdmx:Glossary.Agency scheme.WebHome]]. In other words, [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is not a part of the hierarchical ID structure for agencies. [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is, itself, a [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]].
856 856  
857 857  This supports a hierarchical structure of agencyID.
858 858  
... ... @@ -860,9 +860,9 @@
860 860  
861 861  [[image:1747836776680-229.jpeg]]
862 862  
863 - **Figure 5: Example of Hierarchic Structure of Agencies**
778 +**Figure 5: Example of Hierarchic Structure of Agencies**
864 864  
865 -Each agency is identified by its full hierarchy excluding SDMX.
780 +Each agency is identified by its full [[hierarchy>>doc:sdmx:Glossary.Hierarchy.WebHome]] excluding [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].
866 866  
867 867  The XML representing this structure is shown below.
868 868  
... ... @@ -876,342 +876,271 @@
876 876  
877 877  **Figure 7: Example Showing Use of Agency Identifiers**
878 878  
879 -Each of these maintenance agencies has an identical Codelist with the Id CL_BOP. However, each is uniquely identified by means of the hierarchic agency structure.
794 +Each of these [[maintenance agencies>>doc:sdmx:Glossary.Maintenance agency.WebHome]] has an identical Codelist with the Id CL_BOP. However, each is uniquely identified by means of the hierarchic agency structure.
880 880  
881 881  = 7 Concept Roles =
882 882  
883 883  == 7.1 Overview ==
884 884  
885 -The DSD Components of Dimension and Attribute can play a specific role in the DSD and it is important to some applications that this role is specified. For instance, the following roles are some examples:
800 +The [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] [[Components>>doc:sdmx:Glossary.Component.WebHome]] of [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] and [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] can play a specific role in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] and it is important to some applications that this role is specified. For instance, the following roles are some examples:
886 886  
887 -**Frequency **– in a data set the content of this Component contains information on the frequency of the observation values
802 +**Frequency **– in a [[data set>>doc:sdmx:Glossary.Data set.WebHome]] the content of this [[Component>>doc:sdmx:Glossary.Component.WebHome]] contains information on the frequency of the observation values
803 +**Geography** - in a [[data set>>doc:sdmx:Glossary.Data set.WebHome]] the content of this [[Component>>doc:sdmx:Glossary.Component.WebHome]] contains information on the geographic location of the observation values
804 +**Unit** **of [[Measure>>doc:sdmx:Glossary.Measure.WebHome]]** - in a [[data set>>doc:sdmx:Glossary.Data set.WebHome]] the content of this [[Component>>doc:sdmx:Glossary.Component.WebHome]] contains information on the [[unit of measure>>doc:sdmx:Glossary.Unit of measure.WebHome]] of the observation values
888 888  
889 -**Geography** - in a data set the content of this Component contains information on the geographic location of the observation values
806 +In order for these roles to be extensible and also to enable user communities to maintain community-specific roles, the roles are maintained in a controlled vocabulary which is implemented in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] as (% style="color:#e74c3c" %)Concepts(%%) in a [[Concept Scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]]. The [[Component>>doc:sdmx:Glossary.Component.WebHome]] optionally references this (% style="color:#e74c3c" %)Concept(%%) if it is required to declare the role explicitly. Note that a [[Component>>doc:sdmx:Glossary.Component.WebHome]] can play more than one role and therefore multiple “role” (% style="color:#e74c3c" %)concepts(%%) can be referenced.
890 890  
891 -**Unit** **of Measure** - in a data set the content of this Component contains information on the unit of measure of the observation values
892 -
893 -In order for these roles to be extensible and also to enable user communities to maintain community-specific roles, the roles are maintained in a controlled vocabulary which is implemented in SDMX as Concepts in a Concept Scheme. The Component optionally references this Concept if it is required to declare the role explicitly. Note that a Component can play more than one role and therefore multiple “role” concepts can be referenced.
894 -
895 895  == 7.2 Information Model ==
896 896  
897 897  The Information Model for this is shown below:
898 898  
812 +[[image:1747855024745-946.png]]
899 899  
900 - **Figure 8: Information Model Extract for Concept Role**
814 +**Figure 8: Information Model Extract for Concept Role**
901 901  
902 -It is possible to specify zero or more concept roles for a Dimension, Measure Dimension and Data Attribute (but not the ReportingYearStartDay). The Time Dimension, Primary Measure, and the  Attribute ReportingYearStartDay have explicitly defined roles and cannot be further specified with additional concept roles.
816 +It is possible to specify zero or more (% style="color:#e74c3c" %)concept(%%) roles for a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] and Data [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] (but not the ReportingYearStartDay). The Time [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], Primary [[Measure>>doc:sdmx:Glossary.Measure.WebHome]], and the [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] ReportingYearStartDay have explicitly defined roles and cannot be further specified with additional (% style="color:#e74c3c" %)concept(%%) roles.
903 903  
904 904  == 7.3 Technical Mechanism ==
905 905  
906 -The mechanism for maintain and using concept roles is as follows:
820 +The mechanism for maintain and using (% style="color:#e74c3c" %)concept(%%) roles is as follows:
907 907  
908 -1. Any recognized Agency can have a concept scheme that contains concepts that identify concept roles. Indeed, from a technical perspective any agency can have more than one of these schemes, though this is not recommended.
909 -1. The concept scheme that contains the “role” concepts can contain concepts that do not play a role.
910 -1. There is no explicit indication on the Concept whether it is a ‘role” concept.
911 -1. Therefore, any concept in any concept scheme is capable of being a “role” concept.
912 -1. It is the responsibility of Agencies to ensure their community knows which concepts in which concept schemes play a “role” and the significance and interpretation of this role. In other words, such concepts must be known by applications, there is no technical mechanism that can inform an application on how to process such a “role”.
913 -1. If the concept referenced in the Concept Identity in a DSD component (Dimension, Measure Dimension, Attribute) is contained in the concept scheme containing concept roles then the DSD component could play the role implied by the concept, if this is understood by the processing application.
914 -1. If the concept referenced in the Concept Identity in a DSD component (Dimension, Measure Dimension, Attribute) is not contained in the concept scheme containing concept roles, and the DSD component is playing a role, then the concept role is identified by the Concept Role in the schema.
822 +1. Any recognized Agency can have a [[concept scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] that contains (% style="color:#e74c3c" %)concepts(%%) that identify (% style="color:#e74c3c" %)concept(%%) roles. Indeed, from a technical perspective any agency can have more than one of these schemes, though this is not recommended.
823 +1. The [[concept scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] that contains the “role” (% style="color:#e74c3c" %)concepts(%%) can contain (% style="color:#e74c3c" %)concepts(%%) that do not play a role.
824 +1. There is no explicit indication on the (% style="color:#e74c3c" %)Concept(%%) whether it is a ‘role” (% style="color:#e74c3c" %)concept(%%).
825 +1. Therefore, any (% style="color:#e74c3c" %)concept(%%) in any [[concept scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] is capable of being a “role” (% style="color:#e74c3c" %)concept(%%).
826 +1. It is the responsibility of Agencies to ensure their community knows which (% style="color:#e74c3c" %)concepts(%%) in which [[concept schemes>>doc:sdmx:Glossary.Concept scheme.WebHome]] play a “role” and the significance and interpretation of this role. In other words, such (% style="color:#e74c3c" %)concepts(%%) must be known by applications, there is no technical mechanism that can inform an application on how to process such a “role”.
827 +1. If the (% style="color:#e74c3c" %)concept(%%) referenced in the (% style="color:#e74c3c" %)Concept(%%) Identity in a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] ([[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]) is contained in the [[concept scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] containing (% style="color:#e74c3c" %)concept(%%) roles then the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] could play the role implied by the (% style="color:#e74c3c" %)concept(%%), if this is understood by the processing application.
828 +1. If the (% style="color:#e74c3c" %)concept(%%) referenced in the (% style="color:#e74c3c" %)Concept(%%) Identity in a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] ([[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]) is not contained in the [[concept scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] containing (% style="color:#e74c3c" %)concept(%%) roles, and the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] is playing a role, then the (% style="color:#e74c3c" %)concept(%%) role is identified by the (% style="color:#e74c3c" %)Concept(%%) Role in the schema.
915 915  
916 916  == 7.4 SDMX-ML Examples in a DSD ==
917 917  
918 -The Cross-Domain Concept Scheme maintained by SDMX contains concept role concepts (FREQ chosen as an example).
832 +The [[Cross-Domain Concept>>doc:sdmx:Glossary.Cross-domain concept.WebHome]] Scheme maintained by [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] contains (% style="color:#e74c3c" %)concept(%%) role (% style="color:#e74c3c" %)concepts(%%) (FREQ chosen as an example).
919 919  
920 -[[image:1747836776691-440.jpeg]]
834 +[[image:1747855054559-410.png]]
921 921  
922 -Whether this is a role or not depends upon the application understanding that FREQ in the Cross-Domain Concept Scheme is a role of Frequency.
836 +Whether this is a role or not depends upon the application understanding that FREQ in the [[Cross-Domain Concept>>doc:sdmx:Glossary.Cross-domain concept.WebHome]] Scheme is a role of Frequency.
923 923  
924 -Using a Concept Scheme that is not the Cross-Domain Concept Scheme where it is required to assign a role using the Cross-Domain Concept Scheme. Again FREQ is chosen as the example.
838 +Using a [[Concept Scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] that is not the [[Cross-Domain Concept>>doc:sdmx:Glossary.Cross-domain concept.WebHome]] Scheme where it is required to assign a role using the [[Cross-Domain Concept>>doc:sdmx:Glossary.Cross-domain concept.WebHome]] Scheme. Again FREQ is chosen as the example.
925 925  
926 -[[image:1747836776693-898.jpeg]]
840 +[[image:1747855075263-887.png]]
927 927  
842 +This explicitly states that this [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] is playing a role identified by the FREQ (% style="color:#e74c3c" %)concept(%%) in the [[Cross-Domain Concept>>doc:sdmx:Glossary.Cross-domain concept.WebHome]] Scheme. Again the application needs to understand what FREQ in the [[Cross-Domain Concept>>doc:sdmx:Glossary.Cross-domain concept.WebHome]] Scheme implies in terms of a role.
928 928  
929 -This explicitly states that this Dimension is playing a role identified by the FREQ concept in the Cross-Domain Concept Scheme. Again the application needs to understand what FREQ in the Cross-Domain Concept Scheme implies in terms of a role.
844 +This is all that is required for interoperability within a community. The important point is that a community must recognise a specific Agency as having the authority to define (% style="color:#e74c3c" %)concept(%%) roles and to maintain these “role” (% style="color:#e74c3c" %)concepts(%%) in a [[concept scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] together with documentation on the meaning of the role and any relevant processing implications. This will then ensure there is interoperability between systems that understand the use of these (% style="color:#e74c3c" %)concepts(%%).
930 930  
931 -This is all that is required for interoperability within a community. The important point is that a community must recognise a specific Agency as having the authority to define concept roles and to maintain these “role” concepts in a concept scheme together with documentation on the meaning of the role and any relevant processing implications. This will then ensure there is interoperability between systems that understand the use of these concepts.
846 +Note that each of the [[Components>>doc:sdmx:Glossary.Component.WebHome]] (Data [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]], Primary [[Measure>>doc:sdmx:Glossary.Measure.WebHome]], [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], Time [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]) has a mandatory identity association ((% style="color:#e74c3c" %)Concept(%%) Identity) and if this (% style="color:#e74c3c" %)Concept(%%) also identifies the role then it is possible to state this by
932 932  
933 -Note that each of the Components (Data Attribute, Primary Measure, Dimension, Measure Dimension, Time Dimension) has a mandatory identity association (Concept Identity) and if this Concept also identifies the role then it is possible to state this by
934 -
935 935  == 7.5 SDMX Cross Domain Concept Scheme ==
936 936  
937 -All concepts in the SDMX Cross Domain Concept Scheme are capable of playing a role and this scheme will contain all of the roles that were allowed at version 2.0 and will be maintained with new roles that are agreed at the level of the community using the Cross Domain Concept Scheme.
850 +All (% style="color:#e74c3c" %)concepts(%%) in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Cross Domain [[Concept Scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] are capable of playing a role and this scheme will contain all of the roles that were allowed at (% style="color:#e74c3c" %)version(%%) 2.0 and will be maintained with new roles that are agreed at the (% style="color:#e74c3c" %)level(%%) of the community using the Cross Domain [[Concept Scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]].
938 938  
939 -The table below lists the Concepts that need to be in this scheme either for compatibility with version 2.0 or because of requests for additional roles at version 2.1 which have been accepted.
852 +The table below lists the (% style="color:#e74c3c" %)Concepts(%%) that need to be in this scheme either for compatibility with (% style="color:#e74c3c" %)version(%%) 2.0 or because of requests for additional roles at (% style="color:#e74c3c" %)version(%%) 2.1 which have been accepted.
940 940  
941 -Note that each of the Components (Data Attribute, Primary Measure, Dimension, Measure Dimension, Time Dimension) has a mandatory identity association (Concept Identity) and if this Concept also identifies the role then it is possible to state this by means of the isRole attribute (isRole=true) Additional roles can still be specified by means of the +role association to additional Concepts that identify the role.
854 +Note that each of the [[Components>>doc:sdmx:Glossary.Component.WebHome]] (Data [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]], Primary [[Measure>>doc:sdmx:Glossary.Measure.WebHome]], [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], Time [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]) has a mandatory identity association ((% style="color:#e74c3c" %)Concept(%%) Identity) and if this (% style="color:#e74c3c" %)Concept(%%) also identifies the role then it is possible to state this by means of the isRole [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] (isRole=true) Additional roles can still be specified by means of the +role association to additional (% style="color:#e74c3c" %)Concepts(%%) that identify the role.
942 942  
943 943  = 8 Constraints =
944 944  
945 945  == 8.1 Introduction ==
946 946  
947 -In this version of SDMX the Constraints is a Maintainable Artefact can be associated to one or more of:
860 +In this (% style="color:#e74c3c" %)version(%%) of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] the (% style="color:#e74c3c" %)Constraints(%%) is a [[Maintainable Artefact>>doc:sdmx:Glossary.Maintainable artefact.WebHome]] can be associated to one or more of:
948 948  
949 949  * Data Structure Definition
950 -* Metadata Structure Definition
951 -* Dataflow
952 -* Metadataflow
953 -* Provision Agreement
954 -* Data Provider (this is restricted to a Release Calendar Constraint)
863 +* [[Metadata Structure Definition>>doc:sdmx:Glossary.Metadata structure definition.WebHome]]
864 +* [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]
865 +* [[Metadataflow>>doc:sdmx:Glossary.Metadataflow.WebHome]]
866 +* [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]]
867 +* [[Data Provider>>doc:sdmx:Glossary.Data provider.WebHome]] (this is restricted to a [[Release Calendar>>doc:sdmx:Glossary.Release policy - release calendar.WebHome]] (% style="color:#e74c3c" %)Constraint(%%))
955 955  * Simple or Queryable Datasources
956 956  
957 -Note that regardless of the artifact to which the Constraint is associated, it is constraining the contents of code lists in the DSD to which the constrained object is related. This does not apply, of course, to a Data Provider as the Data Provider can be associated, via the Provision Agreement, to many DSDs. Hence the reason for the restriction on the type of Constraint that can be attached to a Data Provider.
870 +Note that regardless of the artifact to which the (% style="color:#e74c3c" %)Constraint(%%) is associated, it is constraining the contents of [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] to which the constrained object is related. This does not apply, of course, to a [[Data Provider>>doc:sdmx:Glossary.Data provider.WebHome]] as the [[Data Provider>>doc:sdmx:Glossary.Data provider.WebHome]] can be associated, via the [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]], to many DSDs. Hence the reason for the restriction on the type of (% style="color:#e74c3c" %)Constraint(%%) that can be attached to a [[Data Provider>>doc:sdmx:Glossary.Data provider.WebHome]].
958 958  
959 959  == 8.2 Types of Constraint ==
960 960  
961 -The Constraint can be of one of two types:
874 +The (% style="color:#e74c3c" %)Constraint(%%) can be of one of two types:
962 962  
963 -* Content constraint
964 -* Attachable constraint
876 +* Content (% style="color:#e74c3c" %)constraint
877 +* Attachable (% style="color:#e74c3c" %)constraint
965 965  
966 -The attachable constraint is used to define “cube slices” which identify sub sets of data in terms of series keys or dimension values. The purpose of this is to enable metadata to be attached to the constraint, and thereby to the cube slices defined in the Constraint. The metadata can be attached via the “reference metadata” mechanism – MSD and Metadata Set – or via a Group in the DSD. Below is snippet of the schema for a DSD that shows the constructs that enable the Constraint to referenced from a Group in a DSD.
879 +The attachable (% style="color:#e74c3c" %)constraint(%%) is used to define “cube slices” which identify sub sets of data in terms of [[series keys>>doc:sdmx:Glossary.Series key.WebHome]] or [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] values. The purpose of this is to enable metadata to be attached to the (% style="color:#e74c3c" %)constraint(%%), and thereby to the cube slices defined in the (% style="color:#e74c3c" %)Constraint(%%). The metadata can be attached via the “[[reference metadata>>doc:sdmx:Glossary.Reference metadata.WebHome]]” mechanism – [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] and [[Metadata Set>>doc:sdmx:Glossary.Metadata set.WebHome]] – or via a Group in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]. Below is snippet of the schema for a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] that shows the constructs that enable the (% style="color:#e74c3c" %)Constraint(%%) to referenced from a Group in a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
967 967  
968 968  [[image:1747836776695-806.jpeg]]
969 969  
970 970  **Figure 9: Extract from the SDMX-ML Schema showing reference to Attachment Constraint**
971 971  
972 -For the Content Constraint specific “inheritance” rules apply and these are detailed below.
885 +For the Content (% style="color:#e74c3c" %)Constraint(%%) specific “inheritance” rules apply and these are detailed below.
973 973  
974 974  == 8.3 Rules for a Content Constraint ==
975 975  
976 -=== 8.3.1 Scope of a Content Constraint ===
889 +=== 8.3.1 Scope of a Content Constraint ===
977 977  
978 -A Content Constraint is used specify the content of a data or metadata source in terms of the component values or the keys.
891 +A Content (% style="color:#e74c3c" %)Constraint(%%) is used specify the content of a data or metadata source in terms of the [[component>>doc:sdmx:Glossary.Component.WebHome]] values or the keys.
979 979  
980 -In terms of data the components are:
893 +In terms of data the [[components>>doc:sdmx:Glossary.Component.WebHome]] are:
981 981  
982 -* Dimension
983 -* Measure Dimension
984 -* Time Dimension
985 -* Data Attribute
986 -* Primary Measure
895 +* [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
896 +* [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
897 +* Time [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
898 +* Data [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]
899 +* Primary [[Measure>>doc:sdmx:Glossary.Measure.WebHome]]
987 987  
988 -And the keys are the content of the KeyDescriptor – i.e. the series keys composed, for each key, by a value for each Dimension and Measure Dimension
901 +And the keys are the content of the KeyDescriptor – i.e. the [[series keys>>doc:sdmx:Glossary.Series key.WebHome]] composed, for each key, by a value for each [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] and [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
989 989  
990 -In terms of reference metadata the components are:
903 +In terms of [[reference metadata>>doc:sdmx:Glossary.Reference metadata.WebHome]] the [[components>>doc:sdmx:Glossary.Component.WebHome]] are:
991 991  
992 992  * Target Object which is one of:
993 -** Key Descriptor Values o Data Set o Report Period
906 +** Key Descriptor Values o [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] o Report Period
994 994  ** IdentifiableObject
995 -* Metadata Attribute
908 +* Metadata [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]
996 996  
997 -The “key” is therefore the combination of the Target Objects that are defined for the  Metadata Target.
910 +The “key” is therefore the combination of the Target Objects that are defined for the Metadata Target.
998 998  
999 -For a Constraint based on a DSD the Content Constraint can reference one or more of:
912 +For a (% style="color:#e74c3c" %)Constraint(%%) based on a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] the Content (% style="color:#e74c3c" %)Constraint(%%) can reference one or more of:
1000 1000  
1001 1001  * Data Structure Definition
1002 -* Dataflow
1003 -* Provision Agreement
915 +* [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]
916 +* [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]]
1004 1004  
1005 -For a Constraint based on an MSD the Content Constraint can reference one or more of:
918 +For a (% style="color:#e74c3c" %)Constraint(%%) based on an [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] the Content (% style="color:#e74c3c" %)Constraint(%%) can reference one or more of:
1006 1006  
1007 -* Metadata Structure Definition
1008 -* Metadataflow
1009 -* Provision Agreement
920 +* [[Metadata Structure Definition>>doc:sdmx:Glossary.Metadata structure definition.WebHome]]
921 +* [[Metadataflow>>doc:sdmx:Glossary.Metadataflow.WebHome]]
922 +* [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]]
1010 1010  
1011 -Furthermore, there can be more than one Content Constraint specified for a specific object e.g. more than one Constraint for a specific DSD.
924 +Furthermore, there can be more than one Content (% style="color:#e74c3c" %)Constraint(%%) specified for a specific object e.g. more than one (% style="color:#e74c3c" %)Constraint(%%) for a specific [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
1012 1012  
1013 -In view of the flexibility of constraints attachment, clear rules on their usage are required. These are elaborated below.
926 +In view of the flexibility of (% style="color:#e74c3c" %)constraints(%%) attachment, clear rules on their usage are required. These are elaborated below.
1014 1014  
1015 -=== 8.3.2 Multiple Content Constraints ===
928 +=== 8.3.2 Multiple Content Constraints ===
1016 1016  
1017 -There can be many Content Constraints for any Constrainable Artefact (e.g. DSD), subject to the following restrictions:
930 +There can be many Content (% style="color:#e74c3c" %)Constraints(%%) for any Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] (e.g. [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]), subject to the following restrictions:
1018 1018  
1019 -**8.3.2.1 Cube Region**
932 +==== 8.3.2.1 Cube Region ====
1020 1020  
1021 -1. The constraint can contain multiple Member Selections (e.g. Dimension) but:
1022 -1. A specific  Member Selection (e.g. Dimension FREQ)  can only be contained in one Content Constraint for any one attached object (e.g. a specific DSD or specific Dataflow)
934 +1. The (% style="color:#e74c3c" %)constraint(%%) can contain multiple [[Member Selections>>doc:sdmx:Glossary.Member selection.WebHome]] (e.g. [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]) but:
935 +1. A specific [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] (e.g. [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] FREQ) can only be contained in one Content (% style="color:#e74c3c" %)Constraint(%%) for any one attached object (e.g. a specific [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] or specific [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]])
1023 1023  
1024 -**8.3.2.2 Key Set**
937 +==== 8.3.2.2 Key Set ====
1025 1025  
1026 -Key Sets will be processed in the order they appear in the Constraint and wildcards can be used (e.g. any key position not reference explicitly is deemed to be “all values”). As the Key Sets can be “included” or “excluded” it is recommended that Key Sets with wildcards are declared before KeySets with specific series keys. This will minimize the risk that keys are inadvertently included or excluded.  
939 +Key Sets will be processed in the order they appear in the (% style="color:#e74c3c" %)Constraint(%%) and wildcards can be used (e.g. any key position not reference explicitly is deemed to be “all values”). As the Key Sets can be “included” or “excluded” it is recommended that Key Sets with wildcards are declared before KeySets with specific [[series keys>>doc:sdmx:Glossary.Series key.WebHome]]. This will minimize the risk that keys are inadvertently included or excluded.
1027 1027  
1028 -=== 8.3.3 Inheritance of a Content Constraint ===
941 +=== 8.3.3 Inheritance of a Content Constraint ===
1029 1029  
1030 -**8.3.3.1 Attachment levels of a Content Constraint**
943 +==== 8.3.3.1 Attachment levels of a Content Constraint ====
1031 1031  
1032 -There are three levels of constraint attachment for which these inheritance rules apply:
945 +There are three (% style="color:#e74c3c" %)levels(%%) of (% style="color:#e74c3c" %)constraint(%%) attachment for which these inheritance rules apply:
1033 1033  
1034 - DSD/MSD – top level o Dataflow/Metadataflow – second level
947 +* [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]/[[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] – top (% style="color:#e74c3c" %)level
948 +** [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]/[[Metadataflow>>doc:sdmx:Glossary.Metadataflow.WebHome]] – second (% style="color:#e74c3c" %)level
949 +*** [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]] – third (% style="color:#e74c3c" %)level
1035 1035  
1036 -§ Provision Agreement – third level
951 +Note that these rules do not apply to the Simple Datasoucre or Queryable Datasource: the Content (% style="color:#e74c3c" %)Constraint(%%)(s) attached to these [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] are resolved for this [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] only and do not take into account (% style="color:#e74c3c" %)Constraints(%%) attached to other [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] (e.g. [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]]. [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]]).
1037 1037  
1038 -Note that these rules do not apply to the Simple Datasoucre or Queryable Datasource: the Content Constraint(s) attached to these artefacts are resolved for this artefact only and do not take into account Constraints attached to other artefacts (e.g. Provision Agreement. Dataflow, DSD).
953 +It is not necessary for a Content (% style="color:#e74c3c" %)Constraint(%%) to be attached to higher (% style="color:#e74c3c" %)level(%%) artifact. e.g. it is valid to have a Content (% style="color:#e74c3c" %)Constraint(%%) for a [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]] where there are no (% style="color:#e74c3c" %)constraints(%%) attached the relevant [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] or [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
1039 1039  
1040 -It is not necessary for a Content Constraint to be attached to higher level artifact. e.g. it is valid to have a Content Constraint for a Provision Agreement where there are no constraints attached the relevant dataflow or DSD.
955 +==== 8.3.3.2 Cascade rules for processing Constraints ====
1041 1041  
1042 -**8.3.3.2 Cascade rules for processing Constraints**
957 +The processing of the (% style="color:#e74c3c" %)constraints(%%) on either [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]/[[Metadataflow>>doc:sdmx:Glossary.Metadataflow.WebHome]] or [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]] must take into account the (% style="color:#e74c3c" %)constraints(%%) declared at higher (% style="color:#e74c3c" %)levels(%%). The rules for the lower (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraints(%%) (attached to [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]/ [[Metadataflow>>doc:sdmx:Glossary.Metadataflow.WebHome]] and [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]]) are detailed below.
1043 1043  
1044 -The processing of the constraints on either Dataflow/Metadataflow or Provision Agreement must take into account the constraints declared at higher levels. The rules for the lower level constraints (attached to Dataflow/ Metadataflow and Provision Agreement) are detailed below.
959 +Note that there can be a situation where a (% style="color:#e74c3c" %)constraint(%%) is specified at a lower (% style="color:#e74c3c" %)level(%%) before a (% style="color:#e74c3c" %)constraint(%%) is specified at a higher (% style="color:#e74c3c" %)level(%%). Therefore, it is possible that a higher (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) makes a lower (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) invalid. [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] makes no rules on how such a conflict should be handled when processing the (% style="color:#e74c3c" %)constraint(%%) for attachment. However, the cascade rules on evaluating (% style="color:#e74c3c" %)constraints(%%) for usage are clear - the higher (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) takes precedence in any conflicts that result in a less restrictive specification at the lower (% style="color:#e74c3c" %)level(%%).
1045 1045  
1046 -Note that there can be a situation where a constraint is specified at a lower level before a constraint is specified at a higher level. Therefore, it is possible that a higher level constraint makes a lower level constraint invalid. SDMX makes no rules on how such a conflict should be handled when processing the constraint for attachment. However, the cascade rules on evaluating constraints for usage are clear - the higher level constraint takes precedence in any conflicts that result in a less restrictive specification at the lower level.
961 +==== 8.3.3.3 Cube Region ====
1047 1047  
1048 -**8.3.3.3 Cube Region**
963 +1. It is not necessary to have a (% style="color:#e74c3c" %)constraint(%%) on the higher (% style="color:#e74c3c" %)level(%%) artifact (e.g. [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] referenced by the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]) but if there is such a (% style="color:#e74c3c" %)constraint(%%) at the higher (% style="color:#e74c3c" %)level(%%)(s) then:
964 +a. The lower (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) cannot be less restrictive than the (% style="color:#e74c3c" %)constraint(%%) specified for the same [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] (e.g. [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]) at the next higher (% style="color:#e74c3c" %)level(%%) which (% style="color:#e74c3c" %)constraints(%%) that [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] (e.g. if the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] FREQ is constrained to A, Q in a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] then the (% style="color:#e74c3c" %)constraint(%%) at the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] or [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]] cannot be A, Q, M or even just M – it can only further constrain A,Q).
965 +b. The (% style="color:#e74c3c" %)constraint(%%) at the lower (% style="color:#e74c3c" %)level(%%) for any one [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] further constrains the content for the same [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] at the higher (% style="color:#e74c3c" %)level(%%)(s).
966 +1. Any [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] which is not referenced in a Content (% style="color:#e74c3c" %)Constraint(%%) is deemed to be constrained according to the Content (% style="color:#e74c3c" %)Constraint(%%) specified at the next higher (% style="color:#e74c3c" %)level(%%) which (% style="color:#e74c3c" %)constraints(%%) that [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]].
967 +1. If there is a conflict when resolving the (% style="color:#e74c3c" %)constraint(%%) in terms of a lower-(% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) being less restrictive than a higher-(% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) then the (% style="color:#e74c3c" %)constraint(%%) at the higher-(% style="color:#e74c3c" %)level(%%) is used.
1049 1049  
1050 -1. It is not necessary to have a constraint on the higher level artifact (e.g. DSD referenced by the Dataflow) but if there is such a constraint at the higher level(s) then:
1051 -11. The lower level constraint cannot be less restrictive than the constraint specified for the same Member Selection (e.g. Dimension) at the next higher level which constraints that Member Selection (e.g. if the Dimension FREQ is constrained to A, Q in a DSD then the constraint at the Dataflow or Provision Agreement cannot be A, Q, M or even just M – it can only further constrain A,Q).
1052 -11. The constraint at the lower level for any one Member Selection further constrains the content for the same Member Selection at the higher level(s).
1053 -1. Any Member Selection which is not referenced in a Content Constraint is deemed to be constrained according to the Content Constraint specified at the next higher level which constraints that Member Selection.
1054 -1. If there is a conflict when resolving the constraint in terms of a lower-level constraint being less restrictive than a higher-level constraint then the constraint at the higher-level is used.
969 +Note that it is possible for a Content (% style="color:#e74c3c" %)Constraint(%%) at a higher (% style="color:#e74c3c" %)level(%%) to constrain, say, four [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] in a single (% style="color:#e74c3c" %)constraint(%%), and a Content (% style="color:#e74c3c" %)Constraint(%%) at a lower (% style="color:#e74c3c" %)level(%%) to constrain the same four in two, three, or four Content (% style="color:#e74c3c" %)Constraints(%%).
1055 1055  
1056 -Note that it is possible for a Content Constraint at a higher level to constrain, say, four Dimensions in a single constraint, and a Content Constraint at a lower level to constrain the same four in two, three, or four Content Constraints.
971 +==== 8.3.3.4 Key Set ====
1057 1057  
1058 -**8.3.3.4 Key Set**
973 +1. It is not necessary to have a (% style="color:#e74c3c" %)constraint(%%) on the higher (% style="color:#e74c3c" %)level(%%) [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] (e.g. [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] referenced by the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]) but if there is such a (% style="color:#e74c3c" %)constraint(%%) at the higher (% style="color:#e74c3c" %)level(%%)(s) then:
974 +a. The lower (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) cannot be less restrictive than the (% style="color:#e74c3c" %)constraint(%%) specified at the higher (% style="color:#e74c3c" %)level(%%).
975 +b. The (% style="color:#e74c3c" %)constraint(%%) at the lower (% style="color:#e74c3c" %)level(%%) for any one [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] further constrains the keys specified at the higher (% style="color:#e74c3c" %)level(%%)(s).
976 +1. Any [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] which is not referenced in a Content (% style="color:#e74c3c" %)Constraint(%%) is deemed to be constrained according to the Content (% style="color:#e74c3c" %)Constraint(%%) specified at the next higher (% style="color:#e74c3c" %)level(%%) which (% style="color:#e74c3c" %)constraints(%%) that [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]].
977 +1. If there is a conflict when resolving the keys in the (% style="color:#e74c3c" %)constraint(%%) at two (% style="color:#e74c3c" %)levels(%%), in terms of a lower-(% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) being less restrictive than a higher-(% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%), then the offending keys specified at the lower (% style="color:#e74c3c" %)level(%%) are not deemed part of the (% style="color:#e74c3c" %)constraint(%%).
1059 1059  
1060 -1. It is not necessary to have a constraint on the higher level artefact (e.g. DSD referenced by the Dataflow) but if there is such a constraint at the higher level(s) then:
1061 -11. The lower level constraint cannot be less restrictive than the constraint specified at the higher level.
1062 -11. The constraint at the lower level for any one Member Selection further constrains the keys specified at the higher level(s).
1063 -1. Any Member Selection which is not referenced in a Content Constraint is deemed to be constrained according to the Content Constraint specified at the next higher level which constraints that Member Selection.
1064 -1. If there is a conflict when resolving the keys in the constraint at two levels, in terms of a lower-level constraint being less restrictive than a higher-level constraint, then the offending keys specified at the lower level are not deemed part of the constraint.
979 +Note that a Key in a Key Set can have wildcarded [[Components>>doc:sdmx:Glossary.Component.WebHome]]. For instance the (% style="color:#e74c3c" %)constraint(%%) may simply constrain the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] FREQ to “A”, and all keys where the FREQ=A are therefore valid.
1065 1065  
1066 -Note that a Key in a Key Set can have wildcarded Components. For instance the constraint may simply constrain the Dimension FREQ to “A”, and all keys where the FREQ=A are therefore valid.
981 +The following logic explains how the inheritance mechanism works. Note that this is conceptual logic and actual systems may differ in the way this is implemented.
1067 1067  
1068 -The following logic explains how the inheritance mechanism works. Note that this is conceptual logic and actual systems may differ in the way this is implemented. 
983 +1. Determine all possible keys that are valid at the higher (% style="color:#e74c3c" %)level(%%).
984 +1. These keys are deemed to be inherited by the lower (% style="color:#e74c3c" %)level(%%) constrained object, subject to the (% style="color:#e74c3c" %)constraints(%%) specified at the lower (% style="color:#e74c3c" %)level(%%).
985 +1. Determine all possible keys that are possible using the (% style="color:#e74c3c" %)constraints(%%) specified at the lower (% style="color:#e74c3c" %)level(%%).
986 +1. At the lower (% style="color:#e74c3c" %)level(%%) inherit all keys that match with the higher (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%).
987 +1. If there are keys in the lower (% style="color:#e74c3c" %)level(%%) (% style="color:#e74c3c" %)constraint(%%) that are not inherited then the key is invalid (i.e. it is less restrictive).
1069 1069  
1070 -1. Determine all possible keys that are valid at the higher level.
1071 -1. These keys are deemed to be inherited by the lower level constrained object, subject to the constraints specified at the lower level.
1072 -1. Determine all possible keys that are possible using the constraints specified at the lower level.
1073 -1. At the lower level inherit all keys that match with the higher level constraint.
1074 -1. If there are keys in the lower level constraint that are not inherited then the key is invalid (i.e. it is less restrictive).
989 +=== 8.3.4 Constraints Examples ===
1075 1075  
1076 -**8.3.4 Constraints Examples**
1077 -
1078 1078  The following scenario is used.
1079 1079  
1080 -=== DSD ===
993 +__DSD__
1081 1081  
1082 -This contains the following Dimensions:
995 +This contains the following [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]]:
1083 1083  
1084 1084  * GEO – Geography
1085 1085  * SEX – Sex
1086 -* AGE – Age
999 +* [[AGE>>doc:sdmx:Glossary.Age.WebHome]] – [[Age>>doc:sdmx:Glossary.Age.WebHome]]
1087 1087  * CAS – Current Activity Status
1088 1088  
1089 -In the DSD common code lists are used and the requirement is to restrict these at various levels to specify the actual code that are valid for the object to which the Content Constraint is attached.
1002 +In the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] common [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] are used and the requirement is to restrict these at various (% style="color:#e74c3c" %)levels(%%) to specify the actual [[code>>doc:sdmx:Glossary.Code.WebHome]] that are valid for the object to which the Content (% style="color:#e74c3c" %)Constraint(%%) is attached.
1090 1090  
1004 +[[image:1747855493531-357.png]]
1091 1091  
1092 -|(((
1093 -
1094 -)))
1006 +**Figure 10: Example Scenario for Constraints**
1095 1095  
1096 -|(((
1097 -
1098 -)))
1008 +(% style="color:#e74c3c" %)Constraints(%%) are declared as follows:
1099 1099  
1100 -|(((
1101 -
1102 -)))
1010 +[[image:1747855462293-368.png]]
1103 1103  
1104 -|(((
1105 -**Figure**
1106 -)))
1012 +**Figure 11: Example Content Constraints**
1107 1107  
1108 -|(((
1109 -**10**
1110 -)))
1111 -
1112 -|(((
1113 -**:**
1114 -)))
1115 -
1116 -|(((
1117 -**~ Example Sce**
1118 -)))
1119 -
1120 -|(((
1121 -**nario for Constraints**
1122 -)))
1123 -
1124 -|(((
1125 -**~ **
1126 -)))
1127 -
1128 -
1129 -
1130 -Constraints are declared as follows:
1131 -
1132 -
1133 -|(((
1134 -
1135 -)))
1136 -
1137 -|(((
1138 -
1139 -)))
1140 -
1141 -|(((
1142 -
1143 -)))
1144 -
1145 -|(((
1146 -**Figure**
1147 -)))
1148 -
1149 -|(((
1150 -**11**
1151 -)))
1152 -
1153 -|(((
1154 -**:**
1155 -)))
1156 -
1157 -|(((
1158 -**~ Example Content Constraints**
1159 -)))
1160 -
1161 -|(((
1162 -**~ **
1163 -)))
1164 -
1165 -
1166 -
1167 1167  **Notes:**
1168 1168  
1169 -1. AGE is constrained for the DSD and is further restricted for the Dataflow
1016 +1. [[AGE>>doc:sdmx:Glossary.Age.WebHome]] is constrained for the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] and is further restricted for the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] CENSUS_CUBE1.
1017 +1. The same (% style="color:#e74c3c" %)Constraint(%%) applies to both Provision Agreements.
1170 1170  
1171 -CENSUS_CUBE1.
1172 -
1173 -1. The same Constraint applies to both Provision Agreements.
1174 -
1175 1175  The cascade rules elaborated above result as follows:
1176 1176  
1177 -DSD
1021 +__DSD__
1178 1178  
1179 -~1. Constrained by eliminating code 001 from the code list for the AGE Dimension.
1023 +~1. Constrained by eliminating [[code>>doc:sdmx:Glossary.Code.WebHome]] 001 from the [[code list>>doc:sdmx:Glossary.Code list.WebHome]] for the [[AGE>>doc:sdmx:Glossary.Age.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]].
1180 1180  
1181 -=== Dataflow CENSUS_CUBE1 ===
1025 +__Dataflow CENSUS_CUBE1__
1182 1182  
1183 -1. Constrained by restricting the code list for the AGE Dimension to codes 002 and 003(note that this is a more restrictive constraint than that declared for the DSD which specifies all codes except code 001).
1184 -1. Restricts the CAS codes to 003 and 004.
1027 +1. Constrained by restricting the [[code list>>doc:sdmx:Glossary.Code list.WebHome]] for the [[AGE>>doc:sdmx:Glossary.Age.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] to [[codes>>doc:sdmx:Glossary.Code.WebHome]] 002 and 003(note that this is a more restrictive (% style="color:#e74c3c" %)constraint(%%) than that declared for the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] which specifies all [[codes>>doc:sdmx:Glossary.Code.WebHome]] except [[code>>doc:sdmx:Glossary.Code.WebHome]] 001).
1028 +1. Restricts the CAS [[codes>>doc:sdmx:Glossary.Code.WebHome]] to 003 and 004.
1185 1185  
1186 -=== Dataflow CENSUS_CUBE2 ===
1030 +__Dataflow CENSUS_CUBE2__
1187 1187  
1188 -1. Restricts the code list for the CAS Dimension to codes TOT and NAP.
1189 -1. Inherits the AGE constraint applied at the level of the DSD.
1032 +1. Restricts the [[code list>>doc:sdmx:Glossary.Code list.WebHome]] for the CAS [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] to [[codes>>doc:sdmx:Glossary.Code.WebHome]] TOT and NAP.
1033 +1. Inherits the [[AGE>>doc:sdmx:Glossary.Age.WebHome]] (% style="color:#e74c3c" %)constraint(%%) applied at the (% style="color:#e74c3c" %)level(%%) of the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
1190 1190  
1191 -=== Provision Agreements CENSUS_CUBE1_IT ===
1035 +__Provision Agreements CENSUS_CUBE1_IT__
1192 1192  
1193 -1. Restricts the codes for the GEO Dimension to IT and its children.
1194 -1. Inherits the constraints from Dataflow CENSUS_CUBE1  for the AGE and CAS Dimensions.
1037 +1. Restricts the [[codes>>doc:sdmx:Glossary.Code.WebHome]] for the GEO [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] to IT and its children.
1038 +1. Inherits the (% style="color:#e74c3c" %)constraints(%%) from [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] CENSUS_CUBE1 for the [[AGE>>doc:sdmx:Glossary.Age.WebHome]] and CAS [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]].
1195 1195  
1196 -=== Provision Agreements CENSUS_CUBE2_IT ===
1040 +__Provision Agreements CENSUS_CUBE2_IT__
1197 1197  
1198 -1. Restricts the codes for the GEO Dimension to IT and its children.
1199 -1. Inherits the constraints from Dataflow CENSUS_CUBE2 for the CAS Dimension.
1200 -1. Inherits the AGE constraint applied at the level of the DSD.
1042 +1. Restricts the [[codes>>doc:sdmx:Glossary.Code.WebHome]] for the GEO [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] to IT and its children.
1043 +1. Inherits the (% style="color:#e74c3c" %)constraints(%%) from [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] CENSUS_CUBE2 for the CAS [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]].
1044 +1. Inherits the [[AGE>>doc:sdmx:Glossary.Age.WebHome]] (% style="color:#e74c3c" %)constraint(%%) applied at the (% style="color:#e74c3c" %)level(%%) of the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
1201 1201  
1202 -The constraints are defined as follows:
1046 +The (% style="color:#e74c3c" %)constraints(%%) are defined as follows:
1203 1203  
1204 -=== DSD Constraint ===
1048 +__DSD Constraint__
1205 1205  
1206 1206  [[image:1747836776698-720.jpeg]]
1207 1207  
1208 -=== Dataflow Constraints ===
1052 +__[[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] (% style="color:#e74c3c" %)Constraints(%%)__
1209 1209  
1210 1210  [[image:1747836776701-360.jpeg]]
1211 1211  
1212 -=== [[image:1747836776707-834.jpeg]] ===
1056 +[[image:1747836776707-834.jpeg]]
1213 1213  
1214 -=== Provision Agreement Constraint ===
1058 +__Provision Agreement Constraint__
1215 1215  
1216 1216  [[image:1747836776710-262.jpeg]]
1217 1217  
... ... @@ -1219,1060 +1219,894 @@
1219 1219  
1220 1220  == 9.1 Scope ==
1221 1221  
1222 -The scope of this section is to define both best practices and mandatory behaviour for specific aspects of transformation between different formats of SDMX.
1066 +The scope of this section is to define both best practices and mandatory behaviour for specific aspects of transformation between different formats of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].
1223 1223  
1224 1224  == 9.2 Groups and Dimension Groups ==
1225 1225  
1226 -=== 9.2.1 Issue ===
1070 +=== 9.2.1 Issue ===
1227 1227  
1228 -Version 2.1 introduces a more granular mechanism for specifying the relationship between a Data Attribute and the Dimensions to which the attribute applies. The technical construct for this is the Dimension Group. This Dimension Group has no direct equivalent in versions 2.0 and 1.0 and so the application transforming data from a version 2.1 data set to a version 2.0 or version 1.0 data set must decide to which construct the attribute value, whose Attribute is declared in a Dimension Group, should be attached. The closest construct is the “Series” attachment level and in many cases this is the correct construct to use.
1072 +(% style="color:#e74c3c" %)Version(%%) 2.1 introduces a more granular mechanism for specifying the relationship between a Data [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] and the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] to which the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] applies. The technical construct for this is the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group. This [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group has no direct equivalent in (% style="color:#e74c3c" %)versions(%%) 2.0 and 1.0 and so the application transforming data from a (% style="color:#e74c3c" %)version(%%) 2.1 [[data set>>doc:sdmx:Glossary.Data set.WebHome]] to a (% style="color:#e74c3c" %)version(%%) 2.0 or (% style="color:#e74c3c" %)version(%%) 1.0 [[data set>>doc:sdmx:Glossary.Data set.WebHome]] must decide to which construct the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value, whose [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is declared in a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group, should be attached. The closest construct is the “Series” [[attachment level>>doc:sdmx:Glossary.Attachment level.WebHome]] and in many cases this is the correct construct to use.
1229 1229  
1230 -However, there is one case where the attribute MUST be attached to a Group in the version 2.0 and 1.0 message. The conditions of this case are:
1074 +However, there is one case where the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] MUST be attached to a Group in the (% style="color:#e74c3c" %)version(%%) 2.0 and 1.0 message. The conditions of this case are:
1231 1231  
1232 -1. A Group is defined in the DSD with exactly the same Dimensions as a Dimension Group in the same DSD.
1233 -1. The Attribute is defined in the DSD with an Attribute Relationship to the Dimension Group. This attribute is NOT defined as having an Attribute Relationship to the Group.
1076 +1. A Group is defined in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] with exactly the same [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] as a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group in the same [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
1077 +1. The [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is defined in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] with an [[Attribute Relationship>>doc:sdmx:Glossary.Attribute relationship.WebHome]] to the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group. This [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is NOT defined as having an [[Attribute Relationship>>doc:sdmx:Glossary.Attribute relationship.WebHome]] to the Group.
1234 1234  
1235 1235  === 9.2.2 Structural Metadata ===
1236 1236  
1237 -If the conditions defined in 9.2.1are true then on conversion to a version 2.0 or 1.0 DSD (Key Family) the Component/Attribute.attachmentLevel must be set to “Group” and the Component/Attribute/AttachmentGroup” is used to identify the Group. Note that under rule(1) in 1.2.1 this group will have been defined in the V 2.1 DSD and so will be present in the V 2.0 transformation.
1081 +If the conditions defined in 9.2.1are true then on conversion to a (% style="color:#e74c3c" %)version(%%) 2.0 or 1.0 [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] (Key Family) the [[Component>>doc:sdmx:Glossary.Component.WebHome]]/[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]].attachmentLevel must be set to “Group” and the [[Component>>doc:sdmx:Glossary.Component.WebHome]]/[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]/AttachmentGroup” is used to identify the Group. Note that under rule(1) in 1.2.1 this group will have been defined in the V 2.1 [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] and so will be present in the V 2.0 transformation.
1238 1238  
1239 -=== 9.2.3 Data ===
1083 +=== 9.2.3 Data ===
1240 1240  
1241 -If the conditions defined in 9.2.1are true then, on conversion from a 2.1 data set to a 2.0 or 1.0 dataset the attribute value will be placed in the relevant <Group>. If these conditions are not true then the attribute value will be placed in the <Series>.
1085 +If the conditions defined in 9.2.1are true then, on conversion from a 2.1 [[data set>>doc:sdmx:Glossary.Data set.WebHome]] to a 2.0 or 1.0 [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value will be placed in the relevant . If these conditions are not true then the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value will be placed in the .
1242 1242  
1243 1243  === 9.2.4 Compact Schema ===
1244 1244  
1245 -If the conditions defined in 9.2.1are true then the Compact Schema must be generated with the Group present and the Attribute(s) present in that group definition.
1089 +If the conditions defined in 9.2.1are true then the Compact Schema must be generated with the Group present and the [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]](s) present in that group definition.
1246 1246  
1247 1247  = 10 Validation and Transformation Language (VTL) =
1248 1248  
1249 1249  == 10.1 Introduction ==
1250 1250  
1251 -The Validation and Transformation Language (VTL) supports the definition of Transformations, which are algorithms to calculate new data starting from already existing ones[[^^~[4~]^^>>path:#_ftn4]]. The purpose of the VTL in the SDMX context is to enable the:
1095 +The [[Validation and Transformation Language>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] ([[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]) supports the definition of Transformations, which are algorithms to calculate new data starting from already existing ones{{footnote}}The Validation and Transformation Language is a standard language designed and published under the SDMX initiative. VTL is described in the VTL User and Reference Guides available on the SDMX website https://sdmx.org.{{/footnote}}. The purpose of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] context is to enable the:
1252 1252  
1253 -* definition of validation and transformation algorithms, in order to specify how to calculate new data  from existing ones;
1254 -* exchange of the definition of VTL algorithms, also together the definition of the data structures of the involved data (for example, exchange the data structures of a reporting framework together with the validation rules to be applied, exchange the input and output data structures of a calculation task together with the VTL Transformations describing the calculation algorithms);
1255 -* compilation and execution of VTL algorithms, either interpreting the VTL transformations or translating them in whatever other computer language is deemed as appropriate.
1097 +* definition of validation and transformation algorithms, in order to specify how to calculate new data from existing ones;
1098 +* exchange of the definition of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] algorithms, also together the definition of the data structures of the involved data (for example, exchange the data structures of a reporting framework together with the validation rules to be applied, exchange the input and output data structures of a calculation task together with the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Transformations describing the calculation algorithms);
1099 +* compilation and execution of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] algorithms, either interpreting the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations or translating them in whatever other computer language is deemed as appropriate.
1256 1256  
1257 -It is important to note that the VTL has its own information model (IM), derived from the Generic Statistical Information Model (GSIM) and described in the VTL User Guide. The VTL IM is designed to be compatible with more standards, like SDMX, DDI (Data Documentation Initiative) and GSIM, and includes the model artefacts that can be manipulated (inputs and/or outputs of transformations, e.g. “Data Set”, “Data Structure”) and the model artefacts that allow the definition of  the transformation algorithms (e.g. “Transformation”, “Transformation Scheme”).
1101 +It is important to note that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] has its own information model (IM), derived from the Generic Statistical Information Model (GSIM) and described in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] User Guide. The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] IM is designed to be compatible with more standards, like [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], DDI (Data Documentation Initiative) and GSIM, and includes the model [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] that can be manipulated (inputs and/or outputs of transformations, e.g. “[[Data Set>>doc:sdmx:Glossary.Data set.WebHome]]”, “Data Structure”) and the model [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] that allow the definition of the transformation algorithms (e.g. “Transformation”, “Transformation Scheme”).
1258 1258  
1259 -The VTL language can be applied to SDMX artefacts by mapping the SDMX IM model artefacts to the model artefacts that VTL can manipulate. Thus, the SDMX artefacts can be used in VTL as inputs and/or outputs of transformations.  It is important to be aware that the artefacts do not always have the same names in the SDMX and VTL IMs, nor do they always have the same meaning. The more evident example is given by the SDMX Dataset and the VTL “Data Set”, which do not correspond one another: as a matter of fact, the VTL “Data Set” maps to the SDMX “Dataflow”, while the SDMX “Dataset” has no explicit mapping to VTL (such an abstraction is not needed in the definition of VTL transformations). A SDMX “Dataset”, however, is an instance of a SDMX “Dataflow” and can be the artefact on which the VTL transformations are executed (i.e., the transformations are defined on Dataflows and are applied to Dataflow instances that can be Datasets). 
1103 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] language can be applied to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] by (% style="color:#e74c3c" %)mapping(%%) the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] IM model [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] to the model [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] that [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] can manipulate. Thus, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] can be used in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] as inputs and/or outputs of transformations. It is important to be aware that the [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] do not always have the same names in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] and [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] IMs, nor do they always have the same meaning. The more evident example is given by the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataset>>doc:sdmx:Glossary.Data set.WebHome]] and the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] “[[Data Set>>doc:sdmx:Glossary.Data set.WebHome]]”, which do not correspond one another: as a matter of fact, the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] “[[Data Set>>doc:sdmx:Glossary.Data set.WebHome]]” (% style="color:#e74c3c" %)maps(%%) to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] “[[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]”, while the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] “[[Dataset>>doc:sdmx:Glossary.Data set.WebHome]]” has no explicit (% style="color:#e74c3c" %)mapping(%%) to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (such an abstraction is not needed in the definition of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations). A [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] “[[Dataset>>doc:sdmx:Glossary.Data set.WebHome]]”, however, is an instance of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] “[[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]” and can be the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] on which the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations are executed (i.e., the transformations are defined on [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] and are applied to [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] instances that can be Datasets).
1260 1260  
1261 -The VTL programs (Transformation Schemes) are represented in SDMX through the TransformationScheme maintainable class which is composed of Transformation (nameable artefact). Each Transformation assigns the outcome of the evaluation of a VTL expression to a result.
1105 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] programs (Transformation Schemes) are represented in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] through the TransformationScheme maintainable class which is composed of Transformation ([[nameable artefact>>doc:sdmx:Glossary.Nameable artefact.WebHome]]). Each Transformation assigns the outcome of the evaluation of a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] expression to a result.
1262 1262  
1263 -This section does not explain the VTL language or any of the content published in the VTL guides. Rather, this is a description of how the VTL can be used in the SDMX context and applied to SDMX artefacts.
1107 +This section does not explain the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] language or any of the content published in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] guides. Rather, this is a description of how the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] can be used in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] context and applied to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]].
1264 1264  
1265 -== 10.2 References to SDMX artefacts from VTL statements ==
1109 +== 10.2 References to SDMX artefacts from VTL statements ==
1266 1266  
1267 1267  === 10.2.1 Introduction ===
1268 1268  
1269 -The VTL can manipulate SDMX artefacts (or objects) by referencing them through pre-defined conventional names (aliases). 
1113 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] can manipulate [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] (or objects) by referencing them through pre-defined conventional names (aliases).
1270 1270  
1271 -The alias of a SDMX artefact can be its URN (Universal Resource Name), an abbreviation of its URN or another user-defined name.
1115 +The alias of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] can be its URN (Universal Resource Name), an abbreviation of its URN or another user-defined name.
1272 1272  
1273 -In any case, the aliases used in the VTL transformations have to be mapped to the
1117 +In any case, the aliases used in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations have to be (% style="color:#e74c3c" %)mapped(%%) to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] through the VtlMappingScheme and VtlMapping classes (see the section of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] IM relevant to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]). A VtlMapping allows specifying the aliases to be used in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations, rulesets{{footnote}}See also the section “VTL-DL Rulesets” in the VTL Reference Manual.{{/footnote}} or user defined operators{{footnote}}The VTLMapping are used also for User Defined Operators (UDO). Although UDOperators are envisaged to be defined on generic operands, so that the specific artefacts to be manipulated are passed as parameters at their invocation, it is also possible that an UDOperator invokes directly some specific SDMX artefacts. These SDMX artefacts have to be mapped to the corresponding aliases used in the definition of the UDO through the VtlMappingScheme and VtlMapping classes as well. {{/footnote}} to reference [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]]. A VtlMappingScheme is a container for zero or more VtlMapping.
1274 1274  
1275 -SDMX artefacts through the VtlMappingScheme and VtlMapping classes (see the section of the SDMX IM relevant to the VTL). A VtlMapping allows specifying the aliases to be used in the VTL transformations, rulesets[[^^~[5~]^^>>path:#_ftn5]] or user defined operators[[^^~[6~]^^>>path:#_ftn6]]  to reference SDMX artefacts. A VtlMappingScheme is a container for zero or more VtlMapping. 
1119 +The correspondence between an alias and a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] must be one-to-one, meaning that a generic alias identifies one and just one [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] while a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is identified by one and just one alias. In other words, within a VtlMappingScheme an [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] can have just one alias and different [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] cannot have the same alias.
1276 1276  
1277 -The correspondence between an alias and a SDMX artefact must be one-to-one, meaning that a generic alias  identifies one and just one SDMX artefact while a SDMX artefact is identified by one and just one alias. In other words, within a VtlMappingScheme an artefact can have just one alias and different artefacts cannot have the same alias.
1278 -
1279 1279  The references through the URN and the abbreviated URN are described in the following paragraphs.
1280 1280  
1281 1281  === 10.2.2 References through the URN ===
1282 1282  
1283 -This approach has the advantage that in the VTL code the URN of the referenced artefacts is directly intelligible by a human reader but has the drawback that the references are verbose.
1125 +This approach has the advantage that in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[code>>doc:sdmx:Glossary.Code.WebHome]] the URN of the referenced [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] is directly intelligible by a human reader but has the drawback that the references are verbose.
1284 1284  
1285 -The SDMX URN[[^^~[7~]^^>>path:#_ftn7]] is the concatenation of the following parts, separated by special symbols like dot, equal, asterisk, comma, and parenthesis:^^ ^^
1127 +The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] URN{{footnote}}For a complete description of the structure of the URN see the SDMX 2.1 Standards - Section 5 - Registry Specifications, paragraph 6.2.2 (“Universal Resource Name (URN)”).{{/footnote}} is the concatenation of the following parts, separated by special symbols like dot, equal, asterisk, comma, and parenthesis:^^ ^^
1286 1286  
1287 -* SDMXprefix
1288 -* SDMX-IM-package-name 
1289 -* class-name
1290 -* agency-id 
1129 +* SDMXprefix
1130 +* SDMX-IM-package-name
1131 +* class-name
1132 +* agency-id
1291 1291  * maintainedobject-id
1292 1292  * maintainedobject-version
1293 -* container-object-id [[^^~[8~]^^>>path:#_ftn8]]
1135 +* container-object-id{{footnote}}The container-object-id can repeat and may not be present.{{/footnote}}
1294 1294  * object-id
1295 1295  
1296 1296  The generic structure of the URN is the following:
1297 1297  
1298 -SDMXprefix**.**SDMX-IM-package-name**.**class-name**=**agency-id**:**maintainedobject-id
1140 +SDMXprefix**.**SDMX-IM-package-name**.**class-name**=**agency-id**:**maintainedobject-id **(**maintainedobject-version**).***container-object-id**.**object-id
1299 1299  
1300 -**(**maintainedobject-version**).***container-object-id**.**object-id
1142 +The **[[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] prefix** is “urn:sdmx:org”, always the same for all [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]].
1301 1301  
1302 -The **SDMX prefix** is “urn:sdmx:org”, always the same for all SDMX artefacts.
1144 +The **[[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]]-package-name **is the concatenation of the string** **“[[sdmx>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].infomodel.” with the package-name which the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] belongs to. For example, for referencing a [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] the SDMX-IM-package-name is “sdmx.infomodel.datastructure”, because the class [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] belongs to the package “datastructure”.
1303 1303  
1304 -The **SDMX-IM-package-name **is the concatenation of the string** **“sdmx.infomodel.” with the package-name which the artefact belongs to. For example, for referencing a dataflow the SDMX-IM-package-name is  “sdmx.infomodel.datastructure”, because the class ,,Dataflow,, belongs to the package “datastructure”.
1146 +The **class-name** is the name of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] object class which the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] object belongs to (e.g., for referencing a [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] the class-name is “[[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]”). The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] can reference [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] that belong to the classes [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute, (% style="color:#e74c3c" %)Concept(%%), ConceptScheme, Codelist.
1305 1305  
1306 -The **class-name** is the name of the SDMX object class which the SDMX object belongs to (e.g., for referencing a dataflow the class-name is “Dataflow”). The VTL can reference SDMX artefacts that belong to the classes ,,Dataflow, Dimension,,,
1148 +The **agency-id** is the acronym of the agency that owns the definition of the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]], for example for the Eurostat [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] the agency-id is “ESTAT”). The agency-id can be composite (for example AgencyA.Dept1.Unit2).
1307 1307  
1308 -MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute, Concept, ConceptScheme, Codelist.
1150 +The **maintainedobject-id** is the name of the maintained object which the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] belongs to, and in case the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] itself is maintainable{{footnote}}i.e., the artefact belongs to a maintainable class{{/footnote}}, coincides with the name of the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]]. Therefore the maintainedobject-id depends on the class of the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]]:
1309 1309  
1310 -The **agency-id** is the acronym of the agency that owns the definition of the artefact, for example for the Eurostat artefacts the agency-id is “ESTAT”). The agency-id can be composite (for example AgencyA.Dept1.Unit2).
1152 +* if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], which is a maintainable class, the maintainedobject-id is the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] name ([[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]-id);
1153 +* if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], MeasureDimension, TimeDimension, PrimaryMeasure or DataAttribute, which are not maintainable and belong to the DataStructure maintainable class, the maintainedobject-id is the name of the DataStructure (dataStructure-id) which the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] belongs to;
1154 +* if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a (% style="color:#e74c3c" %)Concept(%%), which is not maintainable and belongs to the ConceptScheme maintainable class, ,, ,,the maintainedobject-id is the name of the ConceptScheme (conceptScheme-id) which the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] belongs to;
1155 +* if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a ConceptScheme, which is a maintainable class, ,, ,,the maintainedobject-id is the name of the ConceptScheme (conceptScheme-id);
1156 +* if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a Codelist, which is a maintainable class, the maintainedobject-id is the Codelist name (codelist-id).
1311 1311  
1312 -The **maintainedobject-id** is the name of the maintained object which the artefact belongs to, and in case the artefact itself is maintainable[[^^~[9~]^^>>path:#_ftn9]], coincides with the name of the artefact. Therefore the maintainedobject-id depends on the class of the artefact:
1158 +The **maintainedobject-(% style="color:#e74c3c" %)version(%%)** is the (% style="color:#e74c3c" %)version(%%) of the maintained object which the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] belongs to (for example, possible (% style="color:#e74c3c" %)versions(%%) are 1.0, 2.1, 3.1.2).
1313 1313  
1314 -* if the artefact is a ,,Dataflow,,, which is a maintainable class,  the maintainedobject-id is the Dataflow name (dataflow-id);
1315 -* if the artefact is a Dimension, MeasureDimension, TimeDimension, PrimaryMeasure or DataAttribute, which are not maintainable and belong to the ,,DataStructure,, maintainable class, the maintainedobject-id is the name of the DataStructure (dataStructure-id) which the artefact belongs to;
1316 -* if the artefact is a ,,Concept,,, which is not maintainable and belongs to the ConceptScheme maintainable class, ,, ,,the maintainedobject-id is the name of the ConceptScheme (conceptScheme-id) which the artefact belongs to;
1317 -* if the artefact is a ,,ConceptScheme,,, which is a maintainable class, ,, ,,the maintainedobject-id is the name of the ConceptScheme (conceptScheme-id);
1318 -* if the artefact is a ,,Codelist, ,,which is a maintainable class,  the maintainedobject-id is the Codelist name (codelist-id).
1160 +The **container-object-id** does not apply to the classes that can be referenced in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations, therefore is not present in their URN
1319 1319  
1320 -The **maintainedobject-version** is the version of the maintained object which the artefact belongs to (for example, possible versions are 1.0, 2.1, 3.1.2).
1162 +The **object-id** is the name of the non-[[maintainable artefact>>doc:sdmx:Glossary.Maintainable artefact.WebHome]] (when the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is maintainable its name is already specified as the maintainedobject-id, see above), in particular it has to be specified:
1321 1321  
1322 -The **container-object-id** does not apply to the classes that can be referenced in VTL transformations, therefore is not present in their URN
1164 +* if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], MeasureDimension, TimeDimension, PrimaryMeasure or DataAttribute (the object-id is the name of one of the [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] above, which are data structure [[components>>doc:sdmx:Glossary.Component.WebHome]])
1165 +* if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a (% style="color:#e74c3c" %)Concept(%%) (the object-id is the name of the (% style="color:#e74c3c" %)Concept(%%))
1323 1323  
1324 -The **object-id** is the name of the non-maintainable artefact (when the artefact is maintainable its name is already specified as the maintainedobject-id, see above), in particular it has to be specified:
1167 +For example, by using the URN, the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformation that sums two [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] DF1 and DF2 and assigns the result to a third persistent [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DFR, assuming that DF1, DF2 and DFR are the maintainedobject-id of the three [[dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]], that their (% style="color:#e74c3c" %)version(%%) is 1.0 and their Agency is AG, would be written as{{footnote}}Since these references to SDMX objects include non-permitted characters as per the VTL ID notation, they need to be included between single quotes, according to the VTL rules for irregular names.{{/footnote}}:
1325 1325  
1326 -* if the artefact is a Dimension, MeasureDimension, TimeDimension, PrimaryMeasure or DataAttribute  (the object-id is the name of one of
1327 -
1328 -the artefacts above, which are data structure components)
1329 -
1330 -* if the artefact is a ,,Concept ,,(the object-id is the name of the ,,Concept,,)
1331 -
1332 -For example, by using the URN, the VTL transformation that sums two SDMX dataflows DF1 and DF2 and assigns the result to a third persistent dataflow DFR, assuming that DF1, DF2  and  DFR are the maintainedobject-id of the three dataflows, that their version is 1.0 and their Agency is AG, would be written as[[^^~[10~]^^>>path:#_ftn10]]:
1333 -
1334 1334  ‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DFR(1.0)’  <-
1335 -
1336 -‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DF1(1.0)’   +
1337 -
1170 +‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DF1(1.0)’  +
1338 1338  ‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DF2(1.0)’
1339 1339  
1340 1340  === 10.2.3 Abbreviation of the URN ===
1341 1341  
1342 -The complete formulation of the URN described above is exhaustive but verbose, even for very simple statements. In order to reduce the verbosity through a simplified identifier and make the work of transformation definers easier, proper abbreviations of the URN are possible. Using this approach, the referenced artefacts remain intelligible in the VTL code by a human reader.
1175 +The complete formulation of the URN described above is exhaustive but verbose, even for very simple statements. In order to reduce the verbosity through a simplified identifier and make the work of transformation definers easier, proper abbreviations of the URN are possible. Using this approach, the referenced [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] remain intelligible in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] code by a human reader.
1343 1343  
1344 -The URN can be abbreviated by omitting the parts that are not essential for the identification of the artefact or that can be deduced from other available information, including the context in which the invocation is made. The possible abbreviations are described below.
1177 +The URN can be abbreviated by omitting the parts that are not essential for the identification of the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] or that can be deduced from other available information, including the context in which the invocation is made. The possible abbreviations are described below.
1345 1345  
1346 -* The **SDMXPrefix** can be omitted for all the SDMX objects, because it is a prefixed string (urn:sdmx:org), always the same for SDMX objects.
1347 -* The **SDMX-IM-package-name **can be omitted as well because it can be deduced from the class-name that follows it (the table of the SDMX-IM packages and classes that allows this deduction is in the SDMX 2.1 Standards - Section 5 -  Registry Specifications, paragraph 6.2.3). In particular, considering the object classes of the artefacts that VTL can reference, the package is: 
1348 -** “datastructure” for the classes Dataflow, Dimension, MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute,
1349 -** “conceptscheme” for the classes Concept and ConceptScheme o “codelist” for the class Codelist.
1350 -* The **class-name** can be omitted as it can be deduced from the VTL invocation.  In particular, starting from the VTL class of the invoked artefact (e.g. dataset, component, identifier, measure, attribute, variable, valuedomain),  which is known given the syntax of the invoking VTL operator[[^^~[11~]^^>>path:#_ftn11]], the SDMX class can be deduced from the mapping rules between VTL and SDMX (see the section “Mapping between VTL and SDMX” hereinafter)[[^^~[12~]^^>>path:#_ftn12]].
1351 -* If the **agency-id** is not specified, it is assumed by default equal to the agency-id of the TransformationScheme, UserDefinedOperatorScheme or RulesetScheme from which the artefact is invoked. For example, the agency-id can be omitted if it is the same as the invoking T,,ransformationScheme,, and cannot be omitted if the artefact comes from another agency.[[^^~[13~]^^>>path:#_ftn13]]  Take also into account that, according to the VTL consistency rules, the agency of the result of a ,,Transformation,, must be the same as its ,,TransformationScheme,,, therefore the agency-id can be omitted for all the results (left part of ,,Transformation,, statements).
1352 -* As for the **maintainedobject-id**, this is essential in some cases while in other cases it can be omitted: o if the referenced artefact is a ,,Dataflow,,, which is a maintainable class, the maintainedobject-id is the dataflow-id and obviously cannot be omitted;
1353 -** if the referenced artefact is a Dimension, MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute, which are not maintainable and belong to the ,,DataStructure,, maintainable class, the maintainedobject-id is the dataStructure-id and can be omitted, given that these components are always invoked within the invocation of a ,,Dataflow,,, whose dataStructure-id can be deduced from the
1179 +* The **SDMXPrefix** can be omitted for all the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] objects, because it is a prefixed string (urn:[[sdmx>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]:org), always the same for [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] objects.
1180 +* The **[[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]]-package-name **can be omitted as well because it can be deduced from the class-name that follows it (the table of the [[SDMX-IM>>doc:sdmx:Glossary.SDMX Information Model.WebHome]] packages and classes that allows this deduction is in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 Standards - Section 5 - Registry Specifications, paragraph 6.2.3). In particular, considering the object classes of the [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] that [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] can reference, the package is: 
1181 +** “datastructure” for the classes [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute,
1182 +** “conceptscheme” for the classes (% style="color:#e74c3c" %)Concept(%%) and ConceptScheme
1183 +** “codelist” for the class Codelist.
1184 +* The **class-name** can be omitted as it can be deduced from the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] invocation. In particular, starting from the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] class of the invoked [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] (e.g. [[dataset>>doc:sdmx:Glossary.Data set.WebHome]], [[component>>doc:sdmx:Glossary.Component.WebHome]], identifier, [[measure>>doc:sdmx:Glossary.Measure.WebHome]], [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]], variable, valuedomain), which is known given the syntax of the invoking [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operator{{footnote}}For the syntax of the VTL operators see the VTL Reference Manual{{/footnote}}, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] class can be deduced from the mapping rules between [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (see the section “Mapping between [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]” hereinafter){{footnote}}In case the invoked artefact is a VTL component, which can be invoked only within the invocation of a VTL data set (SDMX dataflow), the specific SDMX class-name (e.g. Dimension, MeasureDimension, TimeDimension, PrimaryMeasure or DataAttribute) can be deduced from the data structure of the SDMX Dataflow which the component belongs to.{{/footnote}}.
1185 +* If the **agency-id** is not specified, it is assumed by default equal to the agency-id of the TransformationScheme, UserDefinedOperatorScheme or RulesetScheme from which the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is invoked. For example, the agency-id can be omitted if it is the same as the invoking TransformationScheme and cannot be omitted if the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] comes from another agency.{{footnote}}If the Agency is composite (for example AgencyA.Dept1.Unit2), the agency is considered different even if only part of the composite name is different (for example AgencyA.Dept1.Unit3 is a different Agency than the previous one). Moreover the agency-id cannot be omitted in part (i.e., if a TransformationScheme owned by AgencyA.Dept1.Unit2 references an artefact coming from AgencyA.Dept1.Unit3, the specification of the agency-id becomes mandatory and must be complete, without omitting the possibly equal parts like AgencyA.Dept1){{/footnote}}(% style="font-size:12px" %) (%%)Take also into account that, according to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] consistency rules, the agency of the result of a Transformation must be the same as its TransformationScheme, therefore the agency-id can be omitted for all the results (left part of Transformation statements).
1186 +* As for the **maintainedobject-id**, this is essential in some cases while in other cases it can be omitted: o if the referenced [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], which is a maintainable class, the maintainedobject-id is the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]-id and obviously cannot be omitted;
1187 +** if the referenced [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute, which are not maintainable and belong to the DataStructure maintainable class, the maintainedobject-id is the dataStructure-id and can be omitted, given that these [[components>>doc:sdmx:Glossary.Component.WebHome]] are always invoked within the invocation of a [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], whose dataStructure-id can be deduced from the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] structural definitions;
1188 +** if the referenced [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a (% style="color:#e74c3c" %)Concept(%%), which is not maintainable and belong to the ConceptScheme maintainable class,,, ,,the maintained object is the conceptScheme-id and cannot be omitted;
1189 +** if the referenced [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a ConceptScheme, which is a,, ,,maintainable class,,, ,,the maintained object is the conceptScheme-id and obviously cannot be omitted;
1190 +** if the referenced [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is a Codelist, which is a maintainable class, the maintainedobject-id is the codelist-id and obviously cannot be omitted.
1191 +* When the maintainedobject-id is omitted, the **maintainedobject-(% style="color:#e74c3c" %)version(%%)** is omitted too. When the maintainedobject-id is not omitted and the maintainedobject-(% style="color:#e74c3c" %)version(%%) is omitted, the (% style="color:#e74c3c" %)version(%%) 1.0 is assumed by default.,, ,,
1192 +* As said, the **container-object-id** does not apply to the classes that can be referenced in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations, therefore is not present in their URN
1193 +* The **object-id** does not exist for the [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] belonging to the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], ConceptScheme and Codelist classes, while it exists and cannot be omitted for the [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] belonging to the classes [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute and (% style="color:#e74c3c" %)Concept(%%), as for them the object-id is the main identifier of the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]]
1354 1354  
1355 -SDMX structural definitions;  o if the referenced artefact is a ,,Concept, ,,which is not maintainable and belong to the ,,ConceptScheme ,,maintainable class,,, ,,the maintained object is the conceptScheme-id and cannot be omitted;
1356 -
1357 -*
1358 -** if the referenced artefact is a ,,ConceptScheme, ,,which is a,, ,,maintainable class,,, ,,the maintained object is the ,,conceptScheme-id,, and obviously cannot be omitted;
1359 -** if the referenced artefact is a ,,Codelist, ,,which is a maintainable class, the maintainedobject-id is the ,,codelist-id,, and obviously cannot be omitted.
1360 -* When the maintainedobject-id is omitted, the **maintainedobject-version** is omitted too. When the maintainedobject-id is not omitted and the maintainedobject-version is omitted, the version 1.0 is assumed by default.,, ,,
1361 -* As said, the **container-object-id** does not apply to the classes that can be referenced in VTL transformations, therefore is not present in their URN
1362 -* The **object-id** does not exist for the artefacts belonging to the ,,Dataflow,,,,, ConceptScheme,, and ,,Codelist,, classes, while it exists and cannot be omitted for the artefacts belonging to the classes Dimension, MeasureDimension, TimeDimension, PrimaryMeasure, DataAttribute and Concept, as for
1363 -
1364 -them the object-id is the main identifier of the artefact
1365 -
1366 1366  The simplified object identifier is obtained by omitting all the first part of the URN, including the special characters, till the first part not omitted.
1367 1367  
1368 1368  For example, the full formulation that uses the complete URN shown at the end of the previous paragraph:
1369 1369  
1370 -‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DFR(1.0)’  := ‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DF1(1.0)’   +
1371 -
1199 +‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DFR(1.0)’  :=
1200 +‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DF1(1.0)’   +
1372 1372  ‘urn:sdmx:org.sdmx.infomodel.datastructure.Dataflow=AG:DF2(1.0)’
1373 1373  
1374 -by omitting all the non-essential parts would become simply:  
1203 +by omitting all the non-essential parts would become simply:
1375 1375  
1376 -DFR  :=  DF1 + DF2
1205 +DFR := DF1 + DF2
1377 1377  
1378 -The references to the ,,Codelists,, can be simplified similarly. For example, given the non-abbreviated reference to the ,,Codelist,,  AG:CL_FREQ(1.0), which is[[^^~[14~]^^>>path:#_ftn14]]:
1207 +The references to the Codelists can be simplified similarly. For example, given the non-abbreviated reference to the Codelist AG:CL_FREQ(1.0), which is{{footnote}}Single quotes are needed because this reference is not a VTL regular name.{{/footnote}}:
1379 1379  
1380 1380  ‘urn:sdmx:org.sdmx.infomodel.codelist.Codelist=AG:CL_FREQ(1.0)’
1381 1381  
1382 -if the ,,Codelist,, is referenced from a ruleset scheme belonging to the agency AG, omitting all the optional parts, the abbreviated reference would become simply[[^^~[15~]^^>>path:#_ftn15]]:
1211 +if the Codelist is referenced from a ruleset scheme belonging to the agency AG, omitting all the optional parts, the abbreviated reference would become simply{{footnote}}Single quotes are not needed in this case because CL_FREQ is a VTL regular name.{{/footnote}}:
1383 1383  
1384 1384  CL_FREQ
1385 1385  
1386 -As for the references to the components, it can be enough to specify the  componentId, given that the dataStructure-Id can be omitted. An example of non-abbreviated reference, if the data structure is DST1 and the component is SECTOR, is the following:
1215 +As for the references to the components, it can be enough to specify the componentId, given that the dataStructure-Id can be omitted. An example of non-abbreviated reference, if the data structure is DST1 and the component is SECTOR, is the following:
1387 1387  
1388 -‘urn:sdmx:org.sdmx.infomodel.datastructure.DataStructure=AG:DST1(1.0).SECTOR’ The corresponding fully abbreviated reference, if made from a transformation scheme belonging to AG, would become simply: 
1217 +‘urn:sdmx:org.sdmx.infomodel.datastructure.DataStructure=AG:DST1(1.0).SECTOR’
1389 1389  
1219 +The corresponding fully abbreviated reference, if made from a transformation scheme belonging to AG, would become simply:
1220 +
1390 1390  SECTOR
1391 1391  
1392 -For example, the transformation for renaming the component SECTOR of the dataflow DF1 into SEC can be written as[[^^~[16~]^^>>path:#_ftn16]]:
1223 +For example, the transformation for renaming the [[component>>doc:sdmx:Glossary.Component.WebHome]] SECTOR of the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF1 into SEC can be written as{{footnote}}The result DFR(1.0) is be equal to DF1(1.0) save that the component SECTOR is called SEC{{/footnote}}:
1393 1393  
1394 1394  ‘DFR(1.0)’ := ‘DF1(1.0)’ [rename SECTOR to SEC]
1395 1395  
1396 -In the references to the Concepts, which can exist for example in the definition of the VTL Rulesets, at least the conceptScheme-id and the concept-id must be specified.
1227 +In the references to the (% style="color:#e74c3c" %)Concepts(%%), which can exist for example in the definition of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Rulesets, at least the conceptScheme-id and the (% style="color:#e74c3c" %)concept(%%)-id must be specified.
1397 1397  
1398 -An example of non-abbreviated reference, if the conceptScheme-id is CS1 and the concept-id is SECTOR, is the following:
1229 +An example of non-abbreviated reference, if the conceptScheme-id is CS1 and the (% style="color:#e74c3c" %)concept(%%)-id is SECTOR, is the following:
1399 1399  
1400 -‘urn:sdmx:org.sdmx.infomodel.conceptscheme.Concept=AG:CS1(1.0).SECTOR’
1231 +‘urn:sdmx:org.sdmx.infomodel.conceptscheme.(% style="color:#e74c3c" %)Concept(%%)=AG:CS1(1.0).SECTOR’
1401 1401  
1402 -The corresponding fully abbreviated reference, if made from a RulesetScheme belonging to AG, would become simply: 
1233 +The corresponding fully abbreviated reference, if made from a RulesetScheme belonging to AG, would become simply:
1403 1403  
1404 1404  CS1(1.0).SECTOR
1405 1405  
1406 -The Codes and in general all the Values can be written without any other specification, for example, the transformation to check if the values of the measures of the dataflow DF1 are between 0 and 25000 can be written like follows:
1237 +The [[Codes>>doc:sdmx:Glossary.Code.WebHome]] and in general all the Values can be written without any other specification, for example, the transformation to check if the values of the [[measures>>doc:sdmx:Glossary.Measure.WebHome]] of the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF1 are between 0 and 25000 can be written like follows:
1407 1407  
1408 1408  ‘DFR(1.0)’ := between ( ‘DF1(1.0)’, 0, 25000 )
1409 1409  
1410 -The artefact (component, concept, codelist …) which the Values are referred to can be deduced from the context in which the reference is made, taking also into account the VTL syntax. In the transformation above, for example, the values 0 and 2500 are compared to the values of the measures of DF1(1.0).
1241 +The [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] ([[component>>doc:sdmx:Glossary.Component.WebHome]], (% style="color:#e74c3c" %)concept(%%), codelist …) which the Values are referred to can be deduced from the context in which the reference is made, taking also into account the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] syntax. In the transformation above, for example, the values 0 and 2500 are compared to the values of the [[measures>>doc:sdmx:Glossary.Measure.WebHome]] of DF1(1.0).
1411 1411  
1412 1412  === 10.2.4 User-defined alias ===
1413 1413  
1414 -The third possibility for referencing SDMX artefacts from VTL statements is to use user-defined aliases not related to the SDMX URN of the artefact.
1245 +The third possibility for referencing [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] statements is to use user-defined aliases not related to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] URN of the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]].
1415 1415  
1416 -This approach gives preference to the use of symbolic names for the SDMX artefacts. As a consequence, in the VTL code the referenced artefacts would become not directly intelligible by a human reader. In any case, the VTL aliases are associated to the SDMX URN through the VtlMappingScheme and VtlMapping classes. These classes provide for structured references to SDMX artefacts whatever kind of reference is used in VTL statements (URN, abbreviated URN or user-defined aliases).
1247 +This approach gives preference to the use of symbolic names for the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]]. As a consequence, in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] code the referenced [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] would become not directly intelligible by a human reader. In any case, the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] aliases are associated to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] URN through the VtlMappingScheme and VtlMapping classes. These classes provide for structured references to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] whatever kind of reference is used in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] statements (URN, abbreviated URN or user-defined aliases).
1417 1417  
1418 1418  === 10.2.5 References to SDMX artefacts from VTL Rulesets ===
1419 1419  
1420 -The VTL Rulesets allow defining sets of reusable rules that can be applied by some
1251 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Rulesets allow defining sets of reusable rules that can be applied by some
1421 1421  
1422 -VTL operators, like the ones for validation and hierarchical roll-up. A “rule” consists in a relationship between Values belonging to some Value Domains or taken by some Variables, for example: (i) when the Country is USA then the Currency is USD; (ii) the Benelux is composed by Belgium, Luxembourg, Netherlands.
1253 +[[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operators, like the ones for validation and hierarchical roll-up. A “rule” consists in a relationship between Values belonging to some Value Domains or taken by some Variables, for example: when the Country is USA then the [[Currency>>doc:sdmx:Glossary.Currency.WebHome]] is USD; (ii) the Benelux is composed by Belgium, Luxembourg, Netherlands.
1423 1423  
1424 -The VTL Rulesets have a signature, in which the Value Domains or the Variables on which the Ruleset is defined are declared, and a body, which contains the rules. 
1255 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Rulesets have a signature, in which the Value Domains or the Variables on which the Ruleset is defined are declared, and a body, which contains the rules.
1425 1425  
1426 -In the signature, given the mapping between VTL and SDMX better described in the following paragraphs, a reference to a VTL Value Domain becomes a reference to a SDMX Codelist or to a SDMX ConceptScheme (for SDMX measure dimensions), while a reference to a VTL Represented Variable becomes a reference to a SDMX Concept, assuming for it a definite representation[[^^~[17~]^^>>path:#_ftn17]].
1257 +In the signature, given the mapping between [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] better described in the following paragraphs, a reference to a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Value Domain becomes a reference to a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Codelist or to a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] ConceptScheme (for [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]]), while a reference to a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Represented Variable becomes a reference to a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concept(%%), assuming for it a definite representation{{footnote}}Rulesets of this kind cannot be reused when the referenced Concept has a different representation.{{/footnote}}.
1427 1427  
1428 -In general, for referencing SDMX Codelists and Concepts, the conventions described in the previous paragraphs apply. In the Ruleset syntax, the elements that reference SDMX artefacts are called “valueDomain” and “variable” for the Datapoint Rulesets and “ruleValueDomain”, “ruleVariable”, “condValueDomain” “condVariable” for the Hierarchical Rulesets). The syntax of the Ruleset signature allows also to define aliases of the elements above, these aliases are valid only within the specific ruleset definition statement and cannot be mapped to SDMX.[[^^~[18~]^^>>path:#_ftn18]]
1259 +In general, for referencing [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Codelists and (% style="color:#e74c3c" %)Concepts(%%), the conventions described in the previous paragraphs apply. In the Ruleset syntax, the elements that reference [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] are called “valueDomain” and “variable” for the Datapoint Rulesets and “ruleValueDomain”, “ruleVariable”, “condValueDomain” “condVariable” for the Hierarchical Rulesets). The syntax of the Ruleset signature allows also to define aliases of the elements above, these aliases are valid only within the specific ruleset definition statement and cannot be (% style="color:#e74c3c" %)mapped(%%) to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].{{footnote}}See also the section “VTL-DL Rulesets” in the VTL Reference Manual.{{/footnote}}
1429 1429  
1430 -In the body of the Rulesets, the Codes and in general all the Values can be written without any other specification, because the artefact  which the Values are referred (Codelist, ConceptScheme, Concept) to can be deduced from the Ruleset signature.
1261 +In the body of the Rulesets, the [[Codes>>doc:sdmx:Glossary.Code.WebHome]] and in general all the Values can be written without any other specification, because the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] which the Values are referred (Codelist, ConceptScheme, (% style="color:#e74c3c" %)Concept(%%)) to can be deduced from the Ruleset signature.
1431 1431  
1432 1432  == 10.3 Mapping between SDMX and VTL artefacts ==
1433 1433  
1434 1434  === 10.3.1 When the mapping occurs ===
1435 1435  
1436 -The mapping methods between the VTL and SDMX object classes allow transforming a SDMX definition in a VTL one and vice-versa for the artefacts to be manipulated.
1267 +The mapping methods between the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] object classes allow transforming a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definition in a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] one and vice-versa for the [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] to be manipulated.
1437 1437  
1438 -It should be remembered that VTL programs (i.e. Transformation Schemes) are represented in SDMX through the TransformationScheme maintainable class which is composed of Transformations (nameable  artefacts). Each Transformation assigns the outcome of the evaluation of a VTL expression to a result: the input operands of the expression and the result can be SDMX artefacts.
1269 +It should be remembered that [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] programs (i.e. Transformation Schemes) are represented in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] through the TransformationScheme maintainable class which is composed of Transformations (nameable [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]]). Each Transformation assigns the outcome of the evaluation of a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] expression to a result: the input operands of the expression and the result can be [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]].
1439 1439  
1440 -Every time a SDMX object is referenced in a VTL Transformation as an input operand, there is the need to generate a VTL definition of the object, so that the VTL operations can take place. This can be made starting from the SDMX definition and applying a SDMX-VTL mapping method in the direction from SDMX to VTL. The possible mapping methods from SDMX to VTL are described in the following paragraphs and are conceived to allow the automatic deduction of the VTL definition of the object from the knowledge of the SDMX definition. 
1271 +Every time a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] object is referenced in a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Transformation as an input operand, there is the need to generate a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] definition of the object, so that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operations can take place. This can be made starting from the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definition and applying a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]-[[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] mapping method in the direction from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]. The possible mapping methods from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] are described in the following paragraphs and are conceived to allow the automatic deduction of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] definition of the object from the knowledge of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definition.
1441 1441  
1442 -In the opposite direction, every time an object calculated by means of VTL must be treated as a SDMX object (for example for exchanging it through SDMX), there is the need of a SDMX definition of the object, so that the SDMX operations can take place.  The SDMX definition is needed for the VTL objects for which a SDMX use is envisaged[[^^~[19~]^^>>path:#_ftn19]].
1273 +In the opposite direction, every time an object calculated by means of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] must be treated as a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] object (for example for exchanging it through [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]), there is the need of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definition of the object, so that the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] operations can take place. The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definition is needed for the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] objects for which a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] use is envisaged{{footnote}}If a calculated artefact is persistent, it needs a persistent definition, i.e. a SDMX definition in a SDMX environment. Also possible calculated artefact that are not persistent may require a SDMX definition, for example when the result of a non-persistent calculation is disseminated through SDMX tools (like an inquiry tool).{{/footnote}}.
1443 1443  
1444 -The mapping methods from VTL to SDMX are described in the following paragraphs as well, however they do not allow the complete SDMX definition to be automatically deduced from the VTL definition,  more than all because the former typically contains additional information in respect to the latter. For example, the definition of a SDMX DSD includes also some mandatory information not available in VTL (like the concept scheme to which the SDMX components refer, the assignmentStatus and attributeRelationship for the DataAttributes and so on). Therefore the mapping methods from VTL to SDMX provide only a general guidance for generating SDMX definitions properly starting from the information available in VTL, independently of how the SDMX definition it is actually generated (manually, automatically or part and part). 
1275 +The mapping methods from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] are described in the following paragraphs as well, however they do not allow the complete [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definition to be automatically deduced from the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] definition, more than all because the former typically contains additional information in respect to the latter. For example, the definition of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] includes also some mandatory information not available in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (like the [[concept scheme>>doc:sdmx:Glossary.Concept scheme.WebHome]] to which the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[components>>doc:sdmx:Glossary.Component.WebHome]] refer, the assignmentStatus and attributeRelationship for the DataAttributes and so on). Therefore the mapping methods from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] provide only a general guidance for generating [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definitions properly starting from the information available in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]], independently of how the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definition it is actually generated (manually, automatically or part and part).
1445 1445  
1446 1446  === 10.3.2 General mapping of VTL and SDMX data structures ===
1447 1447  
1448 -This section makes reference to the VTL “Model for data and their structure”[[^^~[20~]^^>>path:#_ftn20]] and the correspondent SDMX “Data Structure Definition”[[^^~[21~]^^>>path:#_ftn21]].
1279 +This section makes reference to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] “Model for data and their structure”{{footnote}}See the VTL 2.0 User Manual{{/footnote}} and the correspondent [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] “[[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]”{{footnote}}See the SDMX 2.1 Section 2 – Information Model{{/footnote}}
1449 1449  
1450 -The main type of artefact that the VTL can manipulate is the VTL Data Set, which in general is mapped to the SDMX Dataflow. This means that a VTL Transformation, in the SDMX context, expresses the algorithm for calculating a derived Dataflow starting from some already existing Dataflows (either collected or derived).[[^^~[22~]^^>>path:#_ftn22]]
1281 +The main type of [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] can manipulate is the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]], which in general is (% style="color:#e74c3c" %)mapped(%%) to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]. This means that a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Transformation, in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] context, expresses the algorithm for calculating a derived [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] starting from some already existing [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] (either collected or derived).{{footnote}}Besides the mapping between one SDMX Dataflow and one VTL Data Set, it is also possible to map distinct parts of a SDMX Dataflow to different VTL Data Set, as explained in a following paragraph.{{/footnote}}
1451 1451  
1452 -While the VTL Transformations are defined in term of Dataflow definitions, they are assumed to be executed on instances of such Dataflows, provided at runtime to the VTL engine (the mechanism for identifying the instances to be processed are not part of the VTL specifications and depend on the implementation of the VTL-based systems).  As already said, the SDMX Datasets are instances of SDMX Dataflows, therefore a VTL Transformation defined on some SDMX Dataflows can be applied on some corresponding SDMX Datasets.
1283 +While the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Transformations are defined in term of [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] definitions, they are assumed to be executed on instances of such [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]], provided at runtime to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] engine (the mechanism for identifying the instances to be processed are not part of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] specifications and depend on the implementation of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]-based systems). As already said, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Datasets>>doc:sdmx:Glossary.Data set.WebHome]] are instances of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]], therefore a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Transformation defined on some [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] can be applied on some corresponding [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Datasets>>doc:sdmx:Glossary.Data set.WebHome]].
1453 1453  
1454 -A VTL Data Set is structured by one and just one Data Structure and a VTL Data Structure can structure any number of Data Sets. Correspondingly, in the SDMX context a SDMX Dataflow is structured by one and just one DataStructureDefinition and one DataStructureDefinition can structure any number of Dataflows.
1285 +A [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] is structured by one and just one Data Structure and a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Data Structure can structure any number of [[Data Sets>>doc:sdmx:Glossary.Data set.WebHome]]. Correspondingly, in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] context a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] is structured by one and just one DataStructureDefinition and one DataStructureDefinition can structure any number of [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]].
1455 1455  
1456 -A VTL Data Set has a Data Structure made of Components, which in turn can be Identifiers, Measures and Attributes. Similarly, a SDMX DataflowDefinition has a DataStructureDefinition made of components that can be DimensionComponents, PrimaryMeasure and DataAttributes. In turn, a
1287 +A [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] has a Data Structure made of [[Components>>doc:sdmx:Glossary.Component.WebHome]], which in turn can be Identifiers, [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] and [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]]. Similarly, a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataflowDefinition has a DataStructureDefinition made of [[components>>doc:sdmx:Glossary.Component.WebHome]] that can be DimensionComponents, PrimaryMeasure and DataAttributes. In turn, a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DimensionComponent can be a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], a TimeDimension or a MeasureDimension. Correspondingly, in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] implementation of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]], the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Identifiers can be (optionally) distinguished in three sub-classes (Simple Identifier, Time Identifier, [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] Identifier) even if such a distinction is not evidenced in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] IM.
1457 1457  
1458 -SDMX DimensionComponent can be a Dimension, a TimeDimension or a MeasureDimension. Correspondingly, in the SDMX implementation of the VTL, the VTL Identifiers can be (optionally) distinguished in three sub-classes (Simple Identifier, Time Identifier, Measure Identifier) even if such a distinction is not evidenced in the VTL IM. 
1289 +However, a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Data Structure can have any number of Identifiers, [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] and [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]], while a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 DataStructureDefinition can have any number of [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] and DataAttributes but just one PrimaryMeasure{{footnote}}The SDMX community is evaluating the opportunity of allowing more than one measure component in a DataStructureDefinition in the next SDMX major version.{{/footnote}}. This is due to a difference between [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 and [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] in the possible [[representation>>doc:sdmx:Glossary.Representation.WebHome]] methods of the data that contain more [[measures>>doc:sdmx:Glossary.Measure.WebHome]].
1459 1459  
1460 -However, a VTL Data Structure can have any number of Identifiers, Measures and Attributes, while a SDMX 2.1 DataStructureDefinition can have any number of Dimensions and DataAttributes but just one PrimaryMeasure[[^^~[23~]^^>>path:#_ftn23]]. This is due to a difference between SDMX 2.1 and VTL in the possible representation methods of the data that contain more measures.
1291 +As for [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], because the data structure cannot contain more than one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] (i.e., the primaryMeasure), the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of data having more [[measures>>doc:sdmx:Glossary.Measure.WebHome]] is possible only by means of a particular [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]], called MeasureDimension, which is aimed at containing the name of the [[measure>>doc:sdmx:Glossary.Measure.WebHome]] (% style="color:#e74c3c" %)concepts(%%), so that for each observation the value contained in the PrimaryMeasure [[component>>doc:sdmx:Glossary.Component.WebHome]] is the value of the [[measure>>doc:sdmx:Glossary.Measure.WebHome]] (% style="color:#e74c3c" %)concept(%%) reported in the MeasureDimension [[component>>doc:sdmx:Glossary.Component.WebHome]].
1461 1461  
1462 -As for SDMX, because the data structure cannot contain more than one measure component (i.e., the primaryMeasure), the representation of data having more measures is possible only by means of a particular dimension, called MeasureDimension, which is aimed at containing the name of the measure concepts, so that for each observation the value contained in the PrimaryMeasure component is the value of the measure concept reported in the MeasureDimension component. 
1293 +Instead [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] allows either the method above (an identifier containing the name of the [[measure>>doc:sdmx:Glossary.Measure.WebHome]] together with just one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]]) or a more generic method that consists in defining more [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[components>>doc:sdmx:Glossary.Component.WebHome]] in the data structure, one for each [[measure>>doc:sdmx:Glossary.Measure.WebHome]].
1463 1463  
1464 -Instead VTL allows either  the method above (an identifier containing the name of the measure together with just one measure component) or a more generic method that consists in defining more measure components in the data structure, one for each measure.
1295 +Therefore for multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] data more mapping options are possible, as described in more detail in the following sections.
1465 1465  
1466 -Therefore for multi-measure data more mapping options are possible, as described in more detail in the following sections.
1467 -
1468 1468  === 10.3.3 Mapping from SDMX to VTL data structures ===
1469 1469  
1470 -**10.3.3.1 Basic Mapping **
1299 +==== 10.3.3.1 Basic Mapping** ** ====
1471 1471  
1472 -The main mapping method from SDMX to VTL is called **Basic **mapping. This is considered as the default mapping method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes. 1842 When transforming **from SDMX to VTL**, this method consists in leaving the 1843 components unchanged and maintaining their names and roles, according to the 1844 following table:
1301 +The main mapping method from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] is called **Basic **mapping. This is considered as the default mapping method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes.
1473 1473  
1474 -|SDMX|VTL
1475 -|Dimension|(Simple) Identifier
1476 -|Time Dimension|(Time) Identifier
1477 -|Measure Dimension|(Measure) Identifier
1478 -|Primary Measure|Measure
1479 -|Data Attribute|Attribute
1303 +When transforming **from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]**, this method consists in leaving the [[components>>doc:sdmx:Glossary.Component.WebHome]] unchanged and maintaining their names and roles, according to the following table:
1480 1480  
1481 -According to this method, the resulting VTL structures are always mono-measure
1305 +(% style="width:636.294px" %)
1306 +|(% style="width:286px" %)**SDMX**|(% style="width:347px" %)**VTL**
1307 +|(% style="width:286px" %)[[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]|(% style="width:347px" %)(Simple) Identifier
1308 +|(% style="width:286px" %)Time [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]|(% style="width:347px" %)(Time) Identifier
1309 +|(% style="width:286px" %)[[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]|(% style="width:347px" %)([[Measure>>doc:sdmx:Glossary.Measure.WebHome]]) Identifier
1310 +|(% style="width:286px" %)Primary [[Measure>>doc:sdmx:Glossary.Measure.WebHome]]|(% style="width:347px" %)[[Measure>>doc:sdmx:Glossary.Measure.WebHome]]
1311 +|(% style="width:286px" %)Data [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]|(% style="width:347px" %)[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]
1482 1482  
1483 -(i.e., they have just one measure component) and their Measure is the SDMX
1313 +According to this method, the resulting [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures are always mono-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] (i.e., they have just one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]]) and their [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] is the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] PrimaryMeasure. Nevertheless, if the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data structure has a MeasureDimension, which can convey the name of one or more [[measure>>doc:sdmx:Glossary.Measure.WebHome]] (% style="color:#e74c3c" %)concepts(%%), such unique [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] can contain the value of more (conceptual) [[measures>>doc:sdmx:Glossary.Measure.WebHome]] (one for each observation).
1484 1484  
1485 -PrimaryMeasure. Nevertheless, if the SDMX data structure has a MeasureDimension, which can convey the name of one or more measure concepts, such unique measure component can contain the value of more (conceptual) measures (one for each observation).
1315 +As for the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttributes, in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] they are all considered “at data point / observation (% style="color:#e74c3c" %)level(%%)” (i.e. dependent on all the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Identifiers), because [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] does not have the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] AttributeRelationships, which defines the construct to which the DataAttribute is related (e.g. observation, [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] or set or group of [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]], whole [[data set>>doc:sdmx:Glossary.Data set.WebHome]]).
1486 1486  
1487 -As for the SDMX DataAttributes, in VTL they are all considered “at data point / observation level” (i.e. dependent on all the VTL Identifiers), because VTL does not have the SDMX AttributeRelationships, which defines the construct to which the DataAttribute is related (e.g. observation, dimension or set or group of dimensions, whole data set).
1317 +With the Basic mapping, one [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] observation generates one [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data point.
1488 1488  
1489 -With the Basic mapping, one SDMX observation generates one VTL data point.
1319 +==== 10.3.3.2 Pivot Mapping ====
1490 1490  
1491 -**10.3.3.2 Pivot Mapping **
1321 +An alternative mapping method from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] is the **Pivot **mapping, which is different from the Basic method only for the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data structures that contain a MeasureDimension, which are (% style="color:#e74c3c" %)mapped(%%) to multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structures.
1492 1492  
1493 -An alternative mapping method from SDMX to VTL is the **Pivot **mapping, which is different from the Basic method only for the SDMX data structures that contain a MeasureDimension, which are mapped to multi-measure VTL data structures.  
1323 +The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] structures that do not contain a MeasureDimension are (% style="color:#e74c3c" %)mapped(%%) like in the Basic mapping (see the previous paragraph).
1494 1494  
1495 -The SDMX structures that do not contain a MeasureDimension are mapped like in the Basic mapping (see the previous paragraph).
1325 +The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] structures that contain a MeasureDimension are (% style="color:#e74c3c" %)mapped(%%) as follows (this mapping is equivalent to a pivoting operation):
1496 1496  
1497 -The SDMX structures that contain a MeasureDimension are mapped as follows (this mapping is equivalent to a pivoting operation):
1327 +* A [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] simple [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] becomes a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (simple) identifier and a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] TimeDimension becomes a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (time) identifier;
1328 +* Each possible (% style="color:#e74c3c" %)Concept(%%) Cj of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension is (% style="color:#e74c3c" %)mapped(%%) to a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]], having the same name as the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concept(%%) (i.e. Cj); the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] Cj is a new [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] even if the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data structure has not such a [[Component>>doc:sdmx:Glossary.Component.WebHome]];
1329 +* The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension is not (% style="color:#e74c3c" %)mapped(%%) to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (it disappears in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Data Structure);
1330 +* The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] PrimaryMeasure is not (% style="color:#e74c3c" %)mapped(%%) to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] as well (it disappears in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Data Structure);
1331 +* A [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttribute is (% style="color:#e74c3c" %)mapped(%%) in different ways according to its AttributeRelationship:
1332 +** If, according to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] AttributeRelationship, the values of the DataAttribute do not depend on the values of the MeasureDimension, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttribute becomes a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] having the same name. This happens if the AttributeRelationship is not specified (i.e. the DataAttribute does not depend on any DimensionComponent and therefore is at [[data set>>doc:sdmx:Glossary.Data set.WebHome]] (% style="color:#e74c3c" %)level(%%)), or if it refers to a set (or a group) of [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] which does not include the MeasureDimension;
1333 +** Otherwise if, according to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] AttributeRelationship, the values of the DataAttribute depend on the MeasureDimension, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttribute is (% style="color:#e74c3c" %)mapped(%%) to one [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] for each possible (% style="color:#e74c3c" %)Concept(%%) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension; by default, the names of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] are obtained by concatenating the name of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttribute and the names of the correspondent
1498 1498  
1499 -* A SDMX simple dimension becomes a VTL (simple) identifier and a SDMX TimeDimension becomes a VTL (time) identifier;
1500 -* Each possible Concept Cj of the SDMX MeasureDimension is mapped to a VTL Measure, having the same name as the SDMX Concept (i.e. Cj); the VTL Measure Cj is a new VTL component even if the SDMX data structure has not such a Component;
1501 -* The SDMX MeasureDimension is not mapped to VTL (it disappears in the VTL Data Structure);
1502 -* The SDMX PrimaryMeasure is not mapped to VTL as well (it disappears in the VTL Data Structure);
1503 -* A SDMX DataAttribute is mapped in different ways according to its AttributeRelationship:
1504 -** If, according to the SDMX AttributeRelationship, the values of the DataAttribute do not depend on the values of the MeasureDimension, the SDMX DataAttribute becomes a VTL Attribute having the same name.  This happens if the AttributeRelationship is not specified (i.e. the DataAttribute does not depend on any DimensionComponent and therefore is at data set level), or if it refers to a set (or a group) of dimensions which does not include the MeasureDimension;    
1505 -** Otherwise if, according to the SDMX AttributeRelationship,  the values of the DataAttribute depend on the MeasureDimension, the SDMX DataAttribute is mapped to one VTL Attribute for each possible Concept of the SDMX MeasureDimension; by default, the names of the VTL Attributes are obtained by concatenating the name of the SDMX DataAttribute and the names of the correspondent
1335 +(% style="color:#e74c3c" %)Concept(%%) of the MeasureDimension separated by underscore; for example, if the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttribute is named DA and the possible (% style="color:#e74c3c" %)concepts(%%) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension are named C1, C2, …, Cn, then the corresponding [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] will be named DA_C1, DA_C2, …, DA_Cn (if different names are desired, they can be achieved afterwards by renaming the [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] through [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operators). o Like in the Basic mapping, the resulting [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] are considered as dependent on all the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] identifiers (i.e. “at data point / observation (% style="color:#e74c3c" %)level(%%)”), because [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] does not have the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] notion of [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] Relationship.
1506 1506  
1507 -Concept of the MeasureDimension separated by underscore; for example, if the SDMX DataAttribute is named DA and the possible concepts of the SDMX MeasureDimension are named C1, C2, …, Cn, then the corresponding VTL Attributes will be named DA_C1, DA_C2, …, DA_Cn (if different names are desired, they can be achieved afterwards by renaming the Attributes through VTL operators). o Like in the Basic mapping, the resulting VTL Attributes are considered as dependent on all the VTL identifiers (i.e. “at data point / observation level”), because VTL does not have the SDMX notion of Attribute Relationship.
1337 +The summary mapping table of the “pivot” mapping from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] for the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data structures that contain a MeasureDimension is the following:
1508 1508  
1509 -The summary mapping table of the “pivot” mapping from SDMX to VTL for the SDMX data structures that contain a MeasureDimension is the following:
1339 +(% style="width:941.294px" %)
1340 +|(% style="width:441px" %)**SDMX**|(% style="width:497px" %)**VTL**
1341 +|(% style="width:441px" %)[[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]|(% style="width:497px" %)(Simple) Identifier
1342 +|(% style="width:441px" %)TimeDimension|(% style="width:497px" %)(Time) Identifier
1343 +|(% style="width:441px" %)MeasureDimension & PrimaryMeasure|(% style="width:497px" %)One [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] for each (% style="color:#e74c3c" %)Concept(%%) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
1344 +|(% style="width:441px" %)DataAttribute not depending on the MeasureDimension|(% style="width:497px" %)[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]
1345 +|(% style="width:441px" %)DataAttribute depending on the MeasureDimension|(% style="width:497px" %)One [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] for each (% style="color:#e74c3c" %)Concept(%%) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
1510 1510  
1511 -|SDMX|VTL
1512 -|Dimension|(Simple) Identifier
1513 -|TimeDimension|(Time) Identifier
1514 -|MeasureDimension & PrimaryMeasure|One Measure for each Concept of the SDMX Measure Dimension
1515 -|DataAttribute not depending on the MeasureDimension|Attribute
1516 -|DataAttribute depending on the MeasureDimension|One Attribute for each Concept of the SDMX Measure Dimension
1347 +Using this mapping method, the [[components>>doc:sdmx:Glossary.Component.WebHome]] of the data structure can change in the conversion from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and it must be taken into account that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] statements can reference only the [[components>>doc:sdmx:Glossary.Component.WebHome]] of the resulting [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structure.
1517 1517  
1518 -Using this mapping method, the components of the data structure can change in the conversion from SDMX to VTL and it must be taken into account that the VTL 1908 statements can reference only the components of the resulting VTL data structure.
1349 +At observation / data point (% style="color:#e74c3c" %)level(%%), calling Cj (j=1, … n) the j^^th^^ (% style="color:#e74c3c" %)Concept(%%) of the MeasureDimension:
1519 1519  
1520 -At observation / data point level, calling Cj (j=1, … n) the j^^th^^ Concept of the 1911 MeasureDimension:
1351 +* The set of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] observations having the same values for all the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] except than the MeasureDimension become one multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Data Point, having one [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] for each (% style="color:#e74c3c" %)Concept(%%) Cj of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension;
1352 +* The values of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] simple [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]], TimeDimension and DataAttributes not depending on the MeasureDimension (these [[components>>doc:sdmx:Glossary.Component.WebHome]] by definition have always the same values for all the observations of the set above) become the values of the corresponding [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (simple) Identifiers, (time) Identifier and [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]].
1353 +* The value of the PrimaryMeasure of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] observation belonging to the set above and having MeasureDimension=Cj becomes the value of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] Cj
1354 +* For the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttributes depending on the MeasureDimension, the value of the DataAttribute DA of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] observation belonging to the set above and having MeasureDimension=Cj becomes the value of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] DA_Cj
1521 1521  
1522 - The set of SDMX observations having the same values for all the Dimensions except than the MeasureDimension become one multi-measure VTL Data Point, having one Measure for each Concept Cj of the SDMX MeasureDimension;
1356 +==== 10.3.3.3 From SDMX DataAttributes to VTL Measures ====
1523 1523  
1524 -*
1525 -** The values of the SDMX simple Dimensions, TimeDimension and DataAttributes not depending on the MeasureDimension (these components by definition have always the same values for all the observations of the set above) become the values of the corresponding VTL (simple) Identifiers, (time) Identifier and Attributes.
1526 -** The value of the PrimaryMeasure of the SDMX observation belonging to the set above and having MeasureDimension=Cj becomes the value of the VTL Measure Cj
1527 -** For the SDMX DataAttributes depending on the MeasureDimension, the value of the DataAttribute DA of the SDMX observation belonging to the set above and having MeasureDimension=Cj becomes the value of the VTL Attribute DA_Cj
1358 +* In some cases it may happen that the DataAttributes of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataStructure need to be managed as [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]. Therefore, a variant of both the methods above consists in transforming all the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttributes in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary.Measure.WebHome]]. When DataAttributes are converted to [[Measures>>doc:sdmx:Glossary.Measure.WebHome]], the two methods above are called Basic_A2M and Pivot_A2M (the suffix “A2M” stands for [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] to [[Measures>>doc:sdmx:Glossary.Measure.WebHome]]). Obviously, the resulting [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structure is, in general, multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] and does not contain [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]].
1528 1528  
1529 -**10.3.3.3 From SDMX DataAttributes to VTL Measures **
1360 +The Basic_A2M and Pivot_A2M behaves respectively like the Basic and Pivot methods, except that the final [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[components>>doc:sdmx:Glossary.Component.WebHome]], which according to the Basic and Pivot methods would have had the role of [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]], assume instead the role of [[Measure>>doc:sdmx:Glossary.Measure.WebHome]].
1530 1530  
1531 -*
1532 -** In some cases it may happen that the DataAttributes of the SDMX DataStructure need to be managed as Measures in VTL. Therefore, a variant of both the methods above consists in transforming all the SDMX DataAttributes in VTL Measures. When DataAttributes are converted to Measures, the  two methods above are called Basic_A2M and Pivot_A2M (the suffix “A2M” stands for Attributes to Measures). Obviously, the resulting VTL data structure is, in general, multi-measure and does not contain Attributes.
1362 +Proper [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] features allow changing the role of specific [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] even after the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] mapping: they can be useful when only some of the DataAttributes need to be managed as [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary.Measure.WebHome]].
1533 1533  
1534 -The Basic_A2M and Pivot_A2M behaves respectively like the Basic and Pivot methods, except that the final VTL components, which according to the Basic and Pivot methods would have had the role of Attribute, assume instead the role of Measure.
1535 -
1536 -Proper VTL features allow changing the role of specific attributes even after the SDMX to VTL mapping: they can be useful when only some of the DataAttributes need to be managed as VTL Measures.
1537 -
1538 1538  === 10.3.4 Mapping from VTL to SDMX data structures ===
1539 1539  
1540 -**10.3.4.1 Basic Mapping **
1366 +==== 10.3.4.1 Basic Mapping** ** ====
1541 1541  
1542 -The main mapping method **from VTL to SDMX** is called **Basic **mapping as well.
1368 +The main mapping method **from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]** is called **Basic **mapping as well.
1543 1543  
1544 -This is considered as the default mapping method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes. 
1370 +This is considered as the default mapping method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes.
1545 1545  
1546 -The method consists in leaving the components unchanged and maintaining their names and roles in SDMX, according to the following mapping table, which is the same as the basic mapping from SDMX to VTL, only seen in the opposite direction.
1372 +The method consists in leaving the [[components>>doc:sdmx:Glossary.Component.WebHome]] unchanged and maintaining their names and roles in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], according to the following mapping table, which is the same as the basic mapping from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]], only seen in the opposite direction.
1547 1547  
1548 -This mapping method cannot be applied for SDMX 2.1 if the VTL data structure has more than one measure component, given that the SDMX 2.1 DataStructureDefinition allows just one measure component (the
1374 +This mapping method cannot be applied for [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 if the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structure has more than one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]], given that the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 DataStructureDefinition allows just one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] (the PrimaryMeasure). In this case it becomes mandatory to specify a different mapping method through the VtlMappingScheme and VtlDataflowMapping classes.{{footnote}}If future SDMX major versions will allow multi-measures data structures, this method is expected to become applicable even if the VTL data structure has more than one measure{{/footnote}}
1549 1549  
1550 -PrimaryMeasure). In this case it becomes mandatory to specify a different 1958 mapping method through the VtlMappingScheme and VtlDataflowMapping 1959 classes.[[^^~[24~]^^>>path:#_ftn24]]
1376 +Please note that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measures>>doc:sdmx:Glossary.Measure.WebHome]] can have any name while in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 the MeasureComponent has the mandatory name “obs_value”, therefore the name of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] name must become “obs_value” in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1.
1551 1551  
1552 -1960 Please note that the VTL measures can have any name while in SDMX 2.1 the 1961 MeasureComponent has the mandatory name “obs_value”, therefore the name of the VTL measure name must become “obs_value” in SDMX 2.1. 
1553 -
1554 1554  Mapping table:
1555 1555  
1556 -|VTL|SDMX
1557 -|(Simple) Identifier|Dimension
1558 -|(Time) Identifier|TimeDimension
1559 -|(Measure) Identifier|MeasureDimension
1560 -|Measure|PrimaryMeasure
1561 -|Attribute|DataAttribute
1380 +(% style="width:592.294px" %)
1381 +|(% style="width:253px" %)**VTL**|(% style="width:336px" %)**SDMX**
1382 +|(% style="width:253px" %)(Simple) Identifier|(% style="width:336px" %)[[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
1383 +|(% style="width:253px" %)(Time) Identifier|(% style="width:336px" %)TimeDimension
1384 +|(% style="width:253px" %)([[Measure>>doc:sdmx:Glossary.Measure.WebHome]]) Identifier|(% style="width:336px" %)MeasureDimension
1385 +|(% style="width:253px" %)[[Measure>>doc:sdmx:Glossary.Measure.WebHome]]|(% style="width:336px" %)PrimaryMeasure
1386 +|(% style="width:253px" %)[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]|(% style="width:336px" %)DataAttribute
1562 1562  
1563 -If the distinction between simple identifier, time identifier and measure identifier is not maintained in the VTL environment, the classification between Dimension, TimeDimension and MeasureDimension exists only in SDMX, as declared in the relevant DataStructureDefinition.
1388 +If the distinction between simple identifier, time identifier and [[measure>>doc:sdmx:Glossary.Measure.WebHome]] identifier is not maintained in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] environment, the classification between [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], TimeDimension and MeasureDimension exists only in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], as declared in the relevant DataStructureDefinition.
1564 1564  
1565 -Regarding the Attributes, because VTL considers all of them “at observation level”, the corresponding SDMX DataAttributes should be put “at observation level” as well (AttributeRelationships referred to the PrimaryMeasure), unless some other information about their AttributeRelationship is available.
1390 +Regarding the [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]], because [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] considers all of them “at observation (% style="color:#e74c3c" %)level(%%)”, the corresponding [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttributes should be put “at observation (% style="color:#e74c3c" %)level(%%)” as well (AttributeRelationships referred to the PrimaryMeasure), unless some other information about their AttributeRelationship is available.
1566 1566  
1567 -Note that the basic mappings in the two directions (from SDMX 2.1 to VTL 2.0 and vice-versa) are (almost completely) reversible. In fact, if a SDMX 2.1 structure is mapped to a VTL structure and then the latter is mapped back to SDMX 2.1, the resulting data structure is like the original one (apart for the AttributeRelationship, that can be different if the original SDMX 2.1 structure contains DataAttributes that are not at observation level). In reverse order, if a VTL 2.0 mono-measure structure is mapped to SDMX 2.1 and then the latter is mapped back to VTL 2.0, the original data structure is obtained (apart from the name of the VTL measure, that in SDMX 2.1 must become “obs_value”).
1392 +Note that the basic mappings in the two directions (from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] 2.0 and vice-versa) are (almost completely) reversible. In fact, if a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 structure is (% style="color:#e74c3c" %)mapped(%%) to a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structure and then the latter is (% style="color:#e74c3c" %)mapped(%%) back to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1, the resulting data structure is like the original one (apart for the AttributeRelationship, that can be different if the original [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 structure contains DataAttributes that are not at observation (% style="color:#e74c3c" %)level(%%)). In reverse order, if a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] 2.0 mono-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] structure is (% style="color:#e74c3c" %)mapped(%%) to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 and then the latter is (% style="color:#e74c3c" %)mapped(%%) back to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] 2.0, the original data structure is obtained (apart from the name of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]], that in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 must become “obs_value”).
1568 1568  
1569 -As  said, the resulting SDMX definitions must be compliant with the SDMX consistency rules. For example, the SDMX DSD must have the assignmentStatus,  which does not exist in VTL, the AttributeRelationship for the DataAttributes and so on.
1394 +As said, the resulting [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definitions must be compliant with the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] consistency rules. For example, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] must have the assignmentStatus, which does not exist in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]], the AttributeRelationship for the DataAttributes and so on.
1570 1570  
1571 -**10.3.4.2 Unpivot Mapping **
1396 +==== 10.3.4.2 Unpivot Mapping ====
1572 1572  
1573 -An alternative mapping method from VTL to SDMX is the **Unpivot **mapping.  
1398 +An alternative mapping method from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is the **Unpivot **mapping.
1574 1574  
1575 -Although this mapping method can be used in any case, it makes major sense in case the VTL data structure has more than one measure component (multi-measures VTL structure). For such VTL structures, in fact, the basic method cannot be applied, given that by maintaining the data structure unchanged the resulting SDMX data structure would have more than one measure component, which is not allowed by SDMX 2.1 (it allows just one measure component, the PrimaryMeasure, called
1400 +Although this mapping method can be used in any case, it makes major sense in case the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structure has more than one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] (multi-[[measures>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structure). For such [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures, in fact, the basic method cannot be applied, given that by maintaining the data structure unchanged the resulting [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data structure would have more than one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]], which is not allowed by [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 (it allows just one [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]], the PrimaryMeasure, called “obs_value”).
1576 1576  
1577 -“obs_value”).
1402 +The multi-[[measures>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures have not a [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] Identifier (because the [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] are separate [[components>>doc:sdmx:Glossary.Component.WebHome]]) and need to be converted to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] having an added MeasureDimension which disambiguates the multiple [[measures>>doc:sdmx:Glossary.Measure.WebHome]], and an added PrimaryMeasure, in which the [[measures>>doc:sdmx:Glossary.Measure.WebHome]]’ values are maintained.
1578 1578  
1579 -The multi-measures VTL structures have not a Measure Identifier (because the Measures are separate components) and need to be converted to SDMX dataflows having an added MeasureDimension which disambiguates the multiple measures, and an added PrimaryMeasure, in which the measures’ values are maintained.
1580 -
1581 1581  The **unpivot** mapping behaves like follows:
1582 1582  
1583 -* like in the basic mapping, a VTL (simple) identifier becomes a SDMX
1406 +* like in the basic mapping, a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (simple) identifier becomes a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] and a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (time) identifier becomes a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] TimeDimension (as said, a [[measure>>doc:sdmx:Glossary.Measure.WebHome]] identifier cannot exist in multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures);
1407 +* a MeasureDimension [[component>>doc:sdmx:Glossary.Component.WebHome]] called “measure_name” is added to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataStructure;
1408 +* a PrimaryMeasure [[component>>doc:sdmx:Glossary.Component.WebHome]] called “obs_value” is added to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataStructure;
1409 +* each [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] is (% style="color:#e74c3c" %)mapped(%%) to a (% style="color:#e74c3c" %)Concept(%%) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension having the same name as the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] (therefore all the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Components>>doc:sdmx:Glossary.Component.WebHome]] do not originate [[Components>>doc:sdmx:Glossary.Component.WebHome]] in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataStructure);
1410 +* a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] becomes a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttribute having AttributeRelationship referred to all the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DimensionComponents including the TimeDimension and except the MeasureDimension.
1584 1584  
1585 -Dimension and a VTL (time) identifier becomes a SDMX TimeDimension (as said, a  measure identifier cannot exist in multi-measure VTL structures);
1586 -
1587 -* a MeasureDimension component called “measure_name” is added to the SDMX DataStructure;
1588 -* a PrimaryMeasure component called  “obs_value” is added to the SDMX DataStructure;
1589 -* each VTL Measure is mapped to a Concept of the SDMX MeasureDimension  having the same name as the VTL Measure (therefore all the VTL Measure Components do not originate Components in the SDMX DataStructure);
1590 -* a VTL Attribute becomes a SDMX DataAttribute having AttributeRelationship  referred to all the SDMX DimensionComponents including the TimeDimension  and except the MeasureDimension. 
1591 -
1592 1592  The summary mapping table of the **unpivot** mapping method is the following:
1593 1593  
1594 -
1595 -|VTL|SDMX
1596 -|(Simple) Identifier|Dimension
1597 -|(Time) Identifier|TimeDimension
1598 -|All Measure Components|(((
1599 -MeasureDimension (having one Measure Concept for each VTL measure component) &
1600 -
1601 -PrimaryMeasure
1414 +(% style="width:904.294px" %)
1415 +|(% style="width:291px" %)**VTL**|(% style="width:611px" %)**SDMX**
1416 +|(% style="width:291px" %)(Simple) Identifier|(% style="width:611px" %)[[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
1417 +|(% style="width:291px" %)(Time) Identifier|(% style="width:611px" %)TimeDimension
1418 +|(% style="width:291px" %)All [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Components>>doc:sdmx:Glossary.Component.WebHome]]|(% style="width:611px" %)(((
1419 +MeasureDimension (having one [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] (% style="color:#e74c3c" %)Concept(%%) for each [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]]) & PrimaryMeasure
1602 1602  )))
1603 -|Attribute |(((
1604 -DataAttribute depending on all
1605 -
1606 -SDMX Dimensions including the
1607 -
1608 -TimeDimension and except the MeasureDimension
1421 +|(% style="width:291px" %)[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] |(% style="width:611px" %)(((
1422 +DataAttribute depending on all [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] including the TimeDimension and except the MeasureDimension
1609 1609  )))
1610 1610  
1611 -At observation / data point level:
1425 +At observation / data point (% style="color:#e74c3c" %)level(%%):
1612 1612  
1613 - a multi-measure VTL Data Point becomes a set of SDMX observations, one for each VTL measure
1427 +* a multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Data Point becomes a set of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] observations, one for each [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]]
1428 +* the values of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] identifiers become the values of the corresponding [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]], for all the observations of the set above
1429 +* the name of the j^^th^^ [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] (e.g. “Cj”) becomes the value of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension of the j^^th^^ observation of the set (i.e. the (% style="color:#e74c3c" %)Concept(%%) Cj)
1430 +* the value of the j^^th^^ [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] becomes the value of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] PrimaryMeasure of the j^^th^^ observation of the set
1431 +* the values of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] become the values of the corresponding [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttributes (in principle for all the observations of the set above)
1614 1614  
1615 - the values of the VTL identifiers become the values of the corresponding SDMX Dimensions, for all the observations of the set above
1433 +If desired, this method can be applied also to mono-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures, provided that none of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[components>>doc:sdmx:Glossary.Component.WebHome]] has already the role of [[measure>>doc:sdmx:Glossary.Measure.WebHome]] identifier.
1616 1616  
1617 -*
1618 -** the name of the j^^th^^ VTL measure (e.g. “Cj”) becomes the value of the SDMX MeasureDimension of the j^^th^^ observation of the set (i.e. the Concept Cj)
1619 -** the value of the j^^th^^ VTL measure becomes the value of the SDMX PrimaryMeasure of the j^^th^^ observation of the set
1620 -** the values of the VTL Attributes become the values of the corresponding SDMX DataAttributes (in principle for all the observations of the set above)
1435 +Like in the general case, a MeasureDimension [[component>>doc:sdmx:Glossary.Component.WebHome]] called “measure_name” would be added to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataStructure and would have just one possible [[measure>>doc:sdmx:Glossary.Measure.WebHome]] (% style="color:#e74c3c" %)concept(%%), corresponding to the unique [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]]. The original [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] would not become a [[Component>>doc:sdmx:Glossary.Component.WebHome]] in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data structure. The value of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] would be assigned to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] PrimaryMeasure called “obs_value”.
1621 1621  
1622 -If desired, this method can be applied also to mono-measure VTL structures, provided that none of the VTL components has already the role of measure identifier.
1437 +In any case, the resulting [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definitions must be compliant with the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] consistency rules. For example, the possible (% style="color:#e74c3c" %)Concepts(%%) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] MeasureDimension need to be listed in a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] ConceptScheme, with proper id, agency and (% style="color:#e74c3c" %)version(%%); moreover, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] must have the assignmentStatus, which does not exist in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]], the attributeRelationship for the DataAttributes and so on.
1623 1623  
1624 -Like in the general case, a MeasureDimension component called “measure_name” would be added to the SDMX DataStructure and would have just one possible measure concept, corresponding to the unique VTL measure. The original VTL measure component would not become a Component in the SDMX data structure. The value of the VTL measure would be assigned to the SDMX PrimaryMeasure called “obs_value”.
1439 +==== 10.3.4.3 From VTL Measures to SDMX Data Attributes** ** ====
1625 1625  
1626 -In any case, the resulting SDMX definitions must be compliant with the SDMX consistency rules. For example, the possible Concepts of the SDMX MeasureDimension need to be listed in a SDMX ConceptScheme, with proper id, agency and version; moreover, the SDMX DSD must have the assignmentStatus, which does not exist in VTL, the attributeRelationship for the DataAttributes and so on.
1441 +For the multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures (having more than one [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[Component>>doc:sdmx:Glossary.Component.WebHome]]), it may happen that the [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Data Structure need to be managed as DataAttributes in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]. Therefore a third mapping method consists in transforming one [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] primaryMeasure and all the other [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttributes. This method is called M2A (“M2A” stands for “[[Measures>>doc:sdmx:Glossary.Measure.WebHome]] to DataAttributes”).
1627 1627  
1628 -**10.3.4.3 From VTL Measures to SDMX Data Attributes **
1443 +When applied to mono-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures (having one [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]]), the M2A method behaves like the Basic mapping (the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]] becomes the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] primary [[measure>>doc:sdmx:Glossary.Measure.WebHome]] “obs_value”, there is no additional [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[measure>>doc:sdmx:Glossary.Measure.WebHome]] to be converted to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] DataAttribute). Therefore the mapping table is the same as for the Basic method:
1629 1629  
1630 -For the multi-measure VTL structures (having more than one Measure Component), it may happen that the Measures of the VTL Data Structure need to be managed as DataAttributes in SDMX. Therefore a third mapping method consists in transforming one VTL measure in the SDMX primaryMeasure and all the other VTL Measures in SDMX DataAttributes. This method is called M2A (“M2A” stands for “Measures to DataAttributes”).
1445 +(% style="width:591.294px" %)
1446 +|(% style="width:252px" %)**VTL**|(% style="width:336px" %)**SDMX**
1447 +|(% style="width:252px" %)(Simple) Identifier|(% style="width:336px" %)[[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
1448 +|(% style="width:252px" %)(Time) Identifier|(% style="width:336px" %)TimeDimension
1449 +|(% style="width:252px" %)([[Measure>>doc:sdmx:Glossary.Measure.WebHome]]) Identifier (if any)|(% style="width:336px" %)MeasureDimension
1450 +|(% style="width:252px" %)[[Measure>>doc:sdmx:Glossary.Measure.WebHome]]|(% style="width:336px" %)PrimaryMeasure
1451 +|(% style="width:252px" %)[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]|(% style="width:336px" %)DataAttribute
1631 1631  
1632 -When applied to mono-measure VTL structures (having one Measure component), the M2A method behaves like the Basic mapping (the VTL Measure component becomes the SDMX primary measure “obs_value”, there is no additional VTL measure to be converted to SDMX DataAttribute). Therefore the mapping table is the same as for the Basic method:
1453 +For multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures (having more than one [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]]), one [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] becomes the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] PrimaryMeasure while the other [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] maintain their names and values but assume the role of DataAttribute in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]. The choice of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary.Measure.WebHome]] that correspond to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] PrimaryMeasure is left to the definer of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[data structure definition>>doc:sdmx:Glossary.Data structure definition.WebHome]].
1633 1633  
1634 -|VTL|SDMX
1635 -|(Simple) Identifier|Dimension
1636 -|(Time) Identifier|TimeDimension
1637 -|(Measure) Identifier (if any)|MeasureDimension
1638 -|Measure|PrimaryMeasure
1639 -|Attribute|DataAttribute
1455 +Taking into account that the multi-[[measure>>doc:sdmx:Glossary.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] structures do not have a [[measure>>doc:sdmx:Glossary.Measure.WebHome]] identifier, the mapping table is the following:
1640 1640  
1641 -For multi-measure VTL structures (having more than one Measure component), one VTL Measure becomes the SDMX PrimaryMeasure while the other VTL Measures maintain their names and values but assume the role of DataAttribute in SDMX. The choice of the VTL Measure that correspond to the SDMX PrimaryMeasure is left to the definer of the SDMX data structure definition.
1457 +(% style="width:588.294px" %)
1458 +|(% style="width:259px" %)**VTL**|(% style="width:326px" %)**SDMX**
1459 +|(% style="width:259px" %)(Simple) Identifier|(% style="width:326px" %)[[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]
1460 +|(% style="width:259px" %)(Time) Identifier|(% style="width:326px" %)TimeDimension
1461 +|(% style="width:259px" %)One of the [[Measures>>doc:sdmx:Glossary.Measure.WebHome]]|(% style="width:326px" %)PrimaryMeasure
1462 +|(% style="width:259px" %)Other [[Measures>>doc:sdmx:Glossary.Measure.WebHome]]|(% style="width:326px" %)DataAttribute
1463 +|(% style="width:259px" %)[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]|(% style="width:326px" %)DataAttribute
1642 1642  
1643 -2Taking into account that the multi-measure VTL structures do not have a measure 2073 identifier, the mapping table is the following:
1465 +Even in this case, the resulting [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] definitions must be compliant with the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] consistency rules. For example, the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] must have the assignmentStatus, which does not exist in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]], the attributeRelationship for the DataAttributes and so on. In particular, the primaryMeasure of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 2.1 [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] must be called “obs_value” and must be one of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary.Measure.WebHome]], chosen by the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] definer.
1644 1644  
1645 -|VTL|SDMX
1646 -|(Simple) Identifier|Dimension
1647 -|(Time) Identifier|TimeDimension
1648 -|One of the Measures|PrimaryMeasure
1649 -|Other Measures|DataAttribute
1650 -|Attribute|DataAttribute
1651 -
1652 -Even in this case, the resulting SDMX definitions must be compliant with the SDMX consistency rules. For example, the SDMX DSD must have the assignmentStatus,  which does not exist in VTL, the attributeRelationship for the DataAttributes and so on. In particular, the primaryMeasure of the SDMX 2.1 DSD must be called “obs_value” and must be one of the VTL Measures, chosen by the DSD definer.
1653 -
1654 1654  === 10.3.5 Declaration of the mapping methods between data structures ===
1655 1655  
1656 -In order to define and understand properly VTL transformations, the applied mapping methods must be specified in the SDMX structural metadata. If the default mapping method (Basic) is applied, no specification is needed.
1469 +In order to define and understand properly [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations, the applied mapping methods must be specified in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]]. If the default mapping method (Basic) is applied, no specification is needed.
1657 1657  
1471 +A customized mapping can be defined through the VtlMappingScheme and VtlDataflowMapping classes (see the section of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] IM relevant to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]). A VtlDataflowMapping allows specifying the mapping methods to be used for a specific [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], both in the direction from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (toVtlMappingMethod) and from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (fromVtlMappingMethod); in fact a VtlDataflowMapping associates the structured URN that identifies a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] to its [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] alias and its mapping methods.
1658 1658  
1659 -A customized mapping can be defined through the VtlMappingScheme and VtlDataflowMapping classes (see the section of the SDMX IM relevant to the VTL). A VtlDataflowMapping allows specifying the mapping methods to be used for a specific dataflow, both in the direction from SDMX to VTL (toVtlMappingMethod) and from VTL to SDMX (fromVtlMappingMethod); in fact a VtlDataflowMapping associates the structured URN that identifies a SDMX dataflow to its VTL alias and its mapping methods.
1473 +It is possible to specify the toVtlMappingMethod and fromVtlMappingMethod also for the conventional [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] called “generic_dataflow”: in this case the specified mapping methods are intended to become the default ones, overriding the “Basic” methods. In turn, the toVtlMappingMethod and fromVtlMappingMethod declared for a specific [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] are intended to override the default ones for such a [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]].
1660 1660  
1661 -It is possible to specify the toVtlMappingMethod and fromVtlMappingMethod also for the conventional dataflow called “generic_dataflow”: in this case the specified mapping methods are intended to become the default ones, overriding the
1475 + The VtlMappingScheme is a container for zero or more VtlDataflowMapping (besides possible mappings to [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] other than [[dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]]).
1662 1662  
1663 -“Basic” methods. In turn, the toVtlMappingMethod and fromVtlMappingMethod declared for a specific Dataflow are intended to override the default ones for such a Dataflow.
1477 +=== 10.3.6 Mapping dataflow subsets to distinct VTL data sets{{footnote}}The kind of mapping explained here works in combination with a SDMX specific naming convention that requires pre-processing before parsing the VTL expressions. As highlighted below, the identifiers of the VTL datasets are a shortcut of some specific VTL operators applied to the SDMX Dataflows. This is not safe to use outside an SDMX context, as the naming convention may have no meaning there.{{/footnote}} ===
1664 1664  
1665 - The VtlMappingScheme is a container for zero or more VtlDataflowMapping (besides possible mappings to artefacts other than dataflows).
1479 +Until now it as been assumed to (% style="color:#e74c3c" %)map(%%) one SMDX [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] to one [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] and vice-versa. This mapping one-to-one is not mandatory according to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] because a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[data set>>doc:sdmx:Glossary.Data set.WebHome]] is meant to be a set of observations (data points) on a logical plane, having the same logical data structure and the same general meaning, independently of the possible physical [[representation>>doc:sdmx:Glossary.Representation.WebHome]] or storage (see [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] 2.0 User Manual page 24), therefore a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] can be seen either as a unique set of data observations (corresponding to one [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[data set>>doc:sdmx:Glossary.Data set.WebHome]]) or as the union of many sets of data observations (each one corresponding to a distinct [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[data set>>doc:sdmx:Glossary.Data set.WebHome]]).
1666 1666  
1667 -=== 10.3.6 Mapping dataflow subsets to distinct VTL data sets[[^^**~[25~]**^^>>path:#_ftn25]] ===
1481 +As a matter of fact, in some cases it can be useful to define [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operations involving definite parts of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] instead than the whole.{{footnote}}A typical example of this kind is the validation, and more in general the manipulation, of individual time series belonging to the same Dataflow, identifiable through the dimension components of the Dataflow except the time Dimension. The coding of these kind of operations might be simplified by mapping distinct time series (i.e. different parts of a SDMX Dataflow) to distinct VTL data sets.{{/footnote}}
1668 1668  
1669 -Until now it as been assumed to map one SMDX Dataflow to one VTL dataset and vice-versa. This mapping one-to-one is not mandatory according to VTL because a VTL data set is meant to be a set of observations (data points) on a logical plane, having the same logical data structure and the same general meaning, independently of the possible physical representation or storage (see VTL 2.0 User Manual page
1483 +Therefore, in order to make the coding of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operations simpler when applied on parts of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]], it is allowed to (% style="color:#e74c3c" %)map(%%) distinct parts of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] to distinct [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] according to the following rules and conventions. This kind of mapping is possible both from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], as better explained below.{{footnote}}The kind of mapping explained here works in combination with a SDMX specific naming convention that requires pre-processing before parsing the VTL expressions. As highlighted below, the identifiers of the VTL datasets are a shortcut of some specific VTL operators applied to the SDMX Dataflows. This is not safe to use outside an SDMX context, as the naming convention may have no meaning there.{{/footnote}}
1670 1670  
1671 -24), therefore a SDMX Dataflow can be seen either as a unique set of data observations (corresponding to one VTL data set) or as the union of many sets of data observations (each one corresponding to a distinct VTL data set).
1485 +Given a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] and some predefined [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] of its DataStructure, it is allowed to (% style="color:#e74c3c" %)map(%%) the subsets of observations that have the same combination of values for such [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] to correspondent [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]].
1672 1672  
1673 -As a matter of fact, in some cases it can be useful to define VTL operations involving definite parts of a SDMX Dataflow instead than the whole.[[^^~[26~]^^>>path:#_ftn26]]
1487 +For example, assuming that the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF1(1.0) has the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] INDICATOR, TIME_PERIOD and COUNTRY, and that the user declares the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] INDICATOR and COUNTRY as basis for the mapping (i.e. the mapping [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]]): the observations that have the same values for INDICATOR and COUNTRY would be (% style="color:#e74c3c" %)mapped(%%) to the same [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] (and vice-versa).
1674 1674  
1675 -Therefore, in order to make the coding of  VTL operations simpler when applied on parts of SDMX Dataflows, it is allowed to map distinct parts of a SDMX Dataflow to distinct VTL data sets according to the following rules and conventions. This kind of mapping is possible both from SDMX to VTL and from VTL to SDMX, as better explained below.[[^^~[27~]^^>>path:#_ftn27]]
1676 -
1677 - Given a SDMX Dataflow and some predefined Dimensions of its
1678 -
1679 -DataStructure, it is allowed to map the subsets of observations that have the same combination of values for such Dimensions to correspondent VTL datasets.
1680 -
1681 -For example, assuming that the SDMX dataflow DF1(1.0) has the Dimensions INDICATOR, TIME_PERIOD and COUNTRY, and that the user declares the
1682 -
1683 -Dimensions INDICATOR and COUNTRY as basis for the mapping (i.e. the mapping dimensions):  the observations that have the same values for INDICATOR and COUNTRY would be mapped to the same VTL dataset (and vice-versa).
1684 -
1685 1685  In practice, this kind mapping is obtained like follows:
1686 1686  
1687 -* For a given SDMX dataflow, the user (VTL definer) declares  the dimension components on which the mapping will be based, in a given order.[[^^~[28~]^^>>path:#_ftn28]] Following the example above, imagine that the user declares the dimensions INDICATOR and COUNTRY.
1688 -* The VTL dataset is given a name using a special notation also called “ordered concatenation” and composed of the following parts: 
1689 -** The reference to the SDMX dataflow (expressed according to the rules described in the previous paragraphs, i.e. URN, abbreviated
1491 +* For a given [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], the user ([[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] definer) declares the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] [[components>>doc:sdmx:Glossary.Component.WebHome]] on which the mapping will be based, in a given order.{{footnote}}A typical example of this kind is the validation, and more in general the manipulation, of individual time series belonging to the same Dataflow, identifiable through the dimension components of the Dataflow except the time Dimension. The coding of these kind of operations might be simplified by mapping distinct time series (i.e. different parts of a SDMX Dataflow) to distinct VTL data sets.{{/footnote}} Following the example above, imagine that the user declares the [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] INDICATOR and COUNTRY.
1492 +* The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] is given a name using a special notation also called “ordered concatenation” and composed of the following parts: 
1493 +** The reference to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] (expressed according to the rules described in the previous paragraphs, i.e. URN, abbreviated URN or another alias); for example DF(1.0);
1494 +** a slash (“/”) as a separator;{{footnote}}Please note that this kind of mapping is only an option at disposal of the definer of VTL Transformations; in fact it remains always possible to manipulate the needed parts of SDMX Dataflows by means of VTL operators (e.g. “sub”, “filter”, “calc”, “union” …), maintaining a mapping one-to-one between SDMX Dataflows and VTL datasets.{{/footnote}}
1495 +** The reference to a specific part of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] above, expressed as the concatenation of the values that the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] declared above must have, separated by dots (“.”) and written in the order in which these [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] are defined{{footnote}}This definition is made through the ToVtlSubspace and ToVtlSpaceKey classes and/or the FromVtlSuperspace and FromVtlSpaceKey classes, depending on the direction of the mapping (“key” means “dimension”). The mapping of Dataflow subsets can be applied independently in the two directions, also according to different Dimensions. When no Dimension is declared for a given direction, it is assumed that the option of mapping different parts of a SDMX Dataflow to different VTL datasets is not used.{{/footnote}}. For example POPULATION.USA would mean that such a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] is (% style="color:#e74c3c" %)mapped(%%) to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] observations for which the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] //INDICATOR// is equal to POPULATION and the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] //COUNTRY// is equal to USA.
1690 1690  
1691 -URN or another alias); for example DF(1.0); o a slash (“/”) as a separator; [[^^~[29~]^^>>path:#_ftn29]]
1497 +In the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations, this kind of [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] name must be referenced between single quotes because the slash (“/”) is not a regular character according to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] rules.
1692 1692  
1693 -*
1694 -** The reference to a specific part of the SDMX dataflow above, expressed as the concatenation of the values that the SDMX dimensions declared above must have, separated by dots (“.”) and written in the order in which these dimensions are defined[[^^~[30~]^^>>path:#_ftn30]] . For example  POPULATION.USA would mean that such a VTL dataset is mapped to the SDMX observations for which the dimension  //INDICATOR// is equal to POPULATION and the dimension //COUNTRY// is equal to USA.
1499 +Therefore, the generic name of this kind of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] would be:
1695 1695  
1696 -In the VTL transformations, this kind of dataset name must be referenced between single quotes because the slash (“/”) is not a regular character according to the VTL rules.
1501 +> ‘DF(1.0)///INDICATORvalue//.//COUNTRYvalue//’
1697 1697  
1698 -Therefore, the generic name of this kind of VTL datasets would be:
1503 +Where DF(1.0) is the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] and //INDICATORvalue// and //COUNTRYvalue //are placeholders for one value of the INDICATOR and // //COUNTRY dimensions.
1699 1699  
1700 -‘DF(1.0)///INDICATORvalue//.//COUNTRYvalue//’
1505 +Instead the specific name of one of these [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] would be:
1701 1701  
1702 -Where DF(1.0) is the Dataflow and //INDICATORvalue// and //COUNTRYvalue //are placeholders for one value of the INDICATOR and // //COUNTRY dimensions.
1507 +> ‘DF(1.0)/POPULATION.USA’
1703 1703  
1704 -Instead the specific name of one of these VTL datasets would be:
1509 +In particular, this is the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] that contains all the observations of the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF(1.0) for which //INDICATOR// = POPULATION and //COUNTRY// = USA.
1705 1705  
1706 -‘DF(1.0)/POPULATION.USA’
1511 +Let us now analyse the different meaning of this kind of mapping in the two mapping directions, i.e. from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].
1707 1707  
1708 -In particular, this is the VTL dataset that contains all the observations of the dataflow DF(1.0) for which  //INDICATOR// = POPULATION and //COUNTRY// = USA.
1513 +As already said, the mapping from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] happens when the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] are operand of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations, instead the mapping from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] happens when the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] are result of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformation{{footnote}}As a consequence of this formalism, a slash in the name of the VTL dataset assumes the specific meaning of separator between the name of the Dataflow and the values of some of its Dimensions.{{/footnote}} and need to be treated as [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] objects. This kind of mapping can be applied independently in the two directions and the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] on which the mapping is based can be different in the two directions: these [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] are defined in the ToVtlSpaceKey and in the FromVtlSpaceKey classes respectively.
1709 1709  
1710 -Let us now analyse the different meaning of this kind of mapping in the two mapping directions, i.e. from SDMX to VTL and from VTL to SDMX.
1515 +First, let us see what happens in the__ mapping direction from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]__, i.e. when parts of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] (e.g. DF1(1.0)) need to be (% style="color:#e74c3c" %)mapped(%%) to distinct [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] that are operand of some [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations.
1711 1711  
1712 -As already said, the mapping from SDMX to VTL happens when the VTL datasets are operand of VTL transformations, instead the mapping from VTL to SDMX happens when the VTL datasets are result of VTL transformations[[^^~[31~]^^>>path:#_ftn31]] and need to be treated as SDMX objects. This kind of mapping can be applied independently in the two directions and the Dimensions on which the mapping is based can be different in the two directions: these Dimensions are defined in the ToVtlSpaceKey and in the FromVtlSpaceKey classes respectively.
1517 +As already said, each [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] is assumed to contain all the observations of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] having INDICATOR=//INDICATORvalue //and COUNTRY=//COUNTRYvalue//. For example, the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] ‘DF1(1.0)/POPULATION.USA’ would contain all the observations of DF1(1.0) having INDICATOR = POPULATION and COUNTRY = USA.
1713 1713  
1714 -First, let us see what happens in the mapping direction from SDMX to VTL, i.e. when parts of a SDMX dataflow (e.g. DF1(1.0)) need to be mapped to distinct VTL datasets that are operand of some VTL transformations.
1519 +In order to obtain the data structure of these [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] from the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] one, it is assumed that the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] on which the mapping is based are dropped, i.e. not maintained in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structure; this is possible because their values are fixed for each one of the invoked [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] {{footnote}}This is the order in which the dimensions are defined in the ToVtlSpaceKey class or in the FromVtlSpaceKey class, depending on the direction of the mapping.{{/footnote}}. After that, the mapping method from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] specified for the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF1(1.0) is applied (i.e. basic, pivot …).
1715 1715  
1716 -As already said, each VTL dataset is assumed to contain all the observations of the
1521 +In the example above, for all the [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] of the kind ‘DF1(1.0)///INDICATORvalue//.//COUNTRYvalue//’, the [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] INDICATOR and COUNTRY would be dropped so that the data structure of all the resulting [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] would have the identifier TIME_PERIOD only.
1717 1717  
1718 -SDMX dataflow having INDICATOR=//INDICATORvalue //and COUNTRY=
1523 +It should be noted that the desired [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] (i.e. of the kind ‘DF1(1.0)/// INDICATORvalue//.//COUNTRYvalue//’) can be obtained also by applying the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operator “**sub**” (subspace) to the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF1(1.0), like in the following [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] expression:
1719 1719  
1720 -//COUNTRYvalue//. For example, the VTL dataset ‘DF1(1.0)/POPULATION.USA’ would contain all the observations of DF1(1.0) having INDICATOR = POPULATION and COUNTRY = USA.
1525 +> ‘DF1(1.0)/POPULATION.USA’ :=
1526 +> DF1(1.0) [ sub INDICATOR=“POPULATION”, COUNTRY=“USA” ];
1527 +> ‘DF1(1.0)/POPULATION.CANADA’ :=
1528 +> DF1(1.0) [ sub INDICATOR=“POPULATION”, COUNTRY=“CANADA” ];
1529 +> …   …   …
1721 1721  
1722 -In order to obtain the data structure of these VTL datasets from the SDMX one, it is assumed that the SDMX dimensions on which the mapping is based are dropped, i.e. not maintained in the VTL data structure; this is possible because their values are fixed for each one of the invoked VTL datasets[[^^~[32~]^^>>path:#_ftn32]]. After that, the mapping method from SDMX to VTL specified for the dataflow DF1(1.0) is applied (i.e. basic, pivot …). 
1531 +In fact the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operator “sub” has exactly the same behaviour. Therefore, (% style="color:#e74c3c" %)mapping(%%) different parts of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] to different [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] in the direction from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] through the ordered concatenation notation is equivalent to a proper use of the operator “**sub**” on such a [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]].{{footnote}}In case the ordered concatenation notation is used, the VTL Transformation described above, e.g. ‘DF1(1.0)/POPULATION.USA’ := DF1(1.0) [ sub INDICATOR=“POPULATION”, COUNTRY=“USA”], is implicitly executed and, in order to test the overall compliance of the VTL program to the VTL consistency rules, it has to be considered as part of the VTL program even if it is not explicitly coded.{{/footnote}}
1723 1723  
1724 -In the example above, for all the datasets of the kind
1533 +In the direction from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] it is allowed to omit the value of one or more [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] on which the (% style="color:#e74c3c" %)mapping(%%) is based, but maintaining all the separating dots (therefore it may happen to find two or more consecutive dots and dots in the beginning or in the end). The absence of value means that for the corresponding [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] all the values are kept and the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] is not dropped.
1725 1725  
1726 -‘DF1(1.0)///INDICATORvalue//.//COUNTRYvalue//’, the dimensions INDICATOR and COUNTRY would be dropped so that the data structure of all the resulting VTL data sets would have the identifier TIME_PERIOD only.
1535 +For example, ‘DF(1.0)/POPULATION.’ (note the dot in the end of the name) is the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] that contains all the observations of the [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF(1.0) for which //INDICATOR// = POPULATION and COUNTRY = any value.
1727 1727  
1728 -It should be noted that the desired VTL datasets (i.e. of the kind ‘DF1(1.0)/// INDICATORvalue//.//COUNTRYvalue//’) can be obtained also by applying the VTL operator “**sub**” (subspace) to the dataflow DF1(1.0), like in the following VTL expression:
1537 +This is equivalent to the application of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] “sub” operator only to the identifier //INDICATOR//:
1729 1729  
1730 -‘DF1(1.0)/POPULATION.USA’ := 
1539 +> ‘DF1(1.0)/POPULATION.’ := 
1540 +> DF1(1.0) [sub INDICATOR=“POPULATION” ];
1731 1731  
1732 -DF1(1.0) [ sub  INDICATOR=“POPULATION”, COUNTRY=“USA” ];
1542 +Therefore the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] ‘DF1(1.0)/POPULATION.’ would have the identifiers COUNTRY and TIME_PERIOD.
1733 1733  
1544 +Heterogeneous invocations of the same [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] are allowed, i.e. omitting different [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] in different invocations.
1734 1734  
1735 -‘DF1(1.0)/POPULATION.CANADA’ := 
1546 +Let us now analyse the __mapping direction from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]__.
1736 1736  
1737 -DF1(1.0) [ sub  INDICATOR=“POPULATION”, COUNTRY=“CANADA” ];
1548 +In this situation, distinct parts of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] are calculated as distinct [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]], under the (% style="color:#e74c3c" %)constraint(%%) that they must have the same [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structure.
1738 1738  
1550 +For example, let us assume that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] programmer wants to calculate the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] DF2(1.0) having the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] TIME_PERIOD, INDICATOR, and COUNTRY and that such a programmer finds it convenient to calculate separately the parts of DF2(1.0) that have different combinations of values for INDICATOR and COUNTRY:
1739 1739  
1740 -…   …   …
1552 +* each part is calculated as a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] derived [[dataset>>doc:sdmx:Glossary.Data set.WebHome]], result of a dedicated [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformation;{{footnote}}If the whole DF2(1.0) is calculated by means of just one VTL transformation, then the mapping between the SDMX dataflow and the corresponding VTL dataset is one-to-one and this kind of mapping (one SDMX Dataflow to many VTL datasets) does not apply.{{/footnote}}
1553 +* the data structure of all these [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] has the TIME_PERIOD identifier and does not have the INDICATOR and COUNTRY identifiers{{footnote}}This is possible as each VTL dataset corresponds to one particular combination of values of INDICATOR and COUNTRY{{/footnote}}.
1554 +* In fact the VTL operator “sub” has exactly the same behaviour. Therefore, Under these hypothesis, such derived [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] can be (% style="color:#e74c3c" %)mapped(%%) to DF2(1.0) by declaring the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] INDICATOR and COUNTRY as mapping [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]].{{footnote}}The mapping dimensions are defined as FromVtlSpaceKeys of the FromVtlSuperSpace of the VtlDataflowMapping relevant to DF2(1.0){{/footnote}}
1741 1741  
1742 -In fact the VTL operator “sub” has exactly the same behaviour. Therefore, mapping different parts of a SDMX dataflow to different VTL datasets in the direction from SDMX to VTL through the ordered concatenation notation is equivalent to a proper use of the operator “**sub**” on such a dataflow. [[^^~[33~]^^>>path:#_ftn33]]
1556 +The corresponding [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations, assuming that the result needs to be persistent, would be of this kind:^^ ^^[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^~[37~]^^>>path:#_ftn37]]
1743 1743  
1744 -In the direction from SDMX to VTL it is allowed to omit the value of one or more Dimensions on which the mapping is based, but maintaining all the separating dots (therefore it may happen to find two or more consecutive dots and dots in the beginning or in the end). The absence of value means that for the corresponding Dimension all the values are kept and the Dimension is not dropped.
1745 -
1746 -For example, ‘DF(1.0)/POPULATION.’ (note the dot in the end of the name) is the VTL dataset that contains all the observations of the dataflow DF(1.0) for which  //INDICATOR// = POPULATION and COUNTRY = any value.
1747 -
1748 -This is equivalent to the application of the VTL “sub” operator only to the identifier //INDICATOR//:
1749 -
1750 -‘DF1(1.0)/POPULATION.’ := 
1751 -
1752 -DF1(1.0) [ sub  INDICATOR=“POPULATION” ];
1753 -
1754 -
1755 -Therefore the VTL dataset ‘DF1(1.0)/POPULATION.’ would have the identifiers COUNTRY and TIME_PERIOD.
1756 -
1757 -Heterogeneous invocations of the same Dataflow are allowed, i.e. omitting different Dimensions in different invocations.
1758 -
1759 -Let us now analyse the mapping direction from VTL to SDMX.
1760 -
1761 -In this situation, distinct parts of a SDMX dataflow are calculated as distinct VTL datasets, under the constraint that they must have the same VTL data structure.
1762 -
1763 -For example, let us assume that the VTL programmer wants to calculate the SDMX dataflow DF2(1.0) having the Dimensions TIME_PERIOD, INDICATOR, and COUNTRY and that such a programmer finds it convenient to calculate separately the parts of DF2(1.0) that have different combinations of values for INDICATOR and COUNTRY:
1764 -
1765 -* each part is calculated as a  VTL derived dataset, result of a dedicated VTL transformation; [[^^~[34~]^^>>path:#_ftn34]]
1766 -* the data structure of all these VTL datasets has the TIME_PERIOD identifier and does not have the INDICATOR and COUNTRY identifiers.[[^^~[35~]^^>>path:#_ftn35]]
1767 -
1768 -Under these hypothesis, such derived VTL datasets can be mapped to DF2(1.0) by declaring the Dimensions INDICATOR and COUNTRY as mapping dimensions[[^^~[36~]^^>>path:#_ftn36]].
1769 -
1770 -The corresponding VTL transformations, assuming that the result needs to be persistent, would be of this kind:^^ ^^[[^^~[37~]^^>>path:#_ftn37]]
1771 -
1772 1772  ‘DF2(1.0)///INDICATORvalue//.//COUNTRYvalue//’  <-  expression
1773 1773  
1774 1774  Some examples follow, for some specific values of INDICATOR and COUNTRY:
1775 1775  
1776 - ‘DF2(1.0)/GDPPERCAPITA.USA’    <-   expression11;
1777 -
1562 +‘DF2(1.0)/GDPPERCAPITA.USA’  <-   expression11;
1778 1778  ‘DF2(1.0)/GDPPERCAPITA.CANADA’   <-   expression12;
1779 -
1780 1780  …   …   …
1565 +‘DF2(1.0)/POPGROWTH.USA’  <-   expression21;
1566 +‘DF2(1.0)/POPGROWTH.CANADA’  <-   expression22;
1781 1781  
1782 - ‘DF2(1.0)/POPGROWTH.USA’   <-   expression21;
1783 -
1784 - ‘DF2(1.0)/POPGROWTH.CANADA’    <-   expression22;
1785 -
1786 1786  …   …   …
1787 1787  
1570 +As said, it is assumed that these [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] derived [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] have the TIME_PERIOD as the only identifier. In the mapping from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to SMDX, the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] INDICATOR and COUNTRY are added to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data structure on order to obtain the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] one, with the following values respectively:
1788 1788  
1789 -As said, it is assumed that these VTL derived datasets have the TIME_PERIOD as the only identifier.  In the mapping from VTL to SMDX, the Dimensions INDICATOR and COUNTRY are added to the VTL data structure on order to obtain the SDMX one, with the following values respectively:
1572 +[[image:1747859458410-183.png||height="170" width="663"]]
1790 1790  
1791 -|(((
1792 - //VTL dataset //
1574 +It should be noted that the application of this many-to-one mapping from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is equivalent to an appropriate sequence of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Transformations. These use the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operator “calc” to add the proper [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] identifiers (in the example, INDICATOR and COUNTRY) and to assign to them the proper values and the operator “union” in order to obtain the final [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] (in the example DF2(1.0)), that can be (% style="color:#e74c3c" %)mapped(%%) one-to-one to the homonymous [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]. Following the same example, these [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations would be:
1793 1793  
1794 -
1795 -)))|(% colspan="2" %)//INDICATOR value //|(% colspan="2" %)//COUNTRY value//
1796 -|‘DF2(1.0)/GDPPERCAPITA.USA’    |GDPPERCAPITA| | |USA
1797 -|(((
1798 -‘DF2(1.0)/GDPPERCAPITA.CANADA’  
1576 +[[image:1747859612718-454.png||height="451" width="602"]]
1799 1799  
1800 -…   …   …
1801 -)))|GDPPERCAPITA| | |CANADA
1802 -|‘DF2(1.0)/POPGROWTH.USA’   |POPGROWTH | | |USA
1803 -|(((
1804 -‘DF2(1.0)/POPGROWTH.CANADA’   
1578 +In other words, starting from the [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] explicitly calculated through [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] (in the example ‘DF2(1.0)/GDPPERCAPITA.USA’ and so on), the first step consists in calculating other (non-persistent) [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] (in the example DF2bis_GDPPERCAPITA_USA and so on) by adding the identifiers INDICATOR and COUNTRY with the desired values (//INDICATORvalue// and //COUNTRYvalue)//. Finally, all these non-persistent [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] are united and give the final result DF2(1.0)[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^~[38~]^^>>path:#_ftn38]](%%), which can be (% style="color:#e74c3c" %)mapped(%%) one-to-one to the homonymous [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] having the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] [[components>>doc:sdmx:Glossary.Component.WebHome]] TIME_PERIOD, INDICATOR and COUNTRY.
1805 1805  
1806 -…   …   …
1807 -)))|POPGROWTH | | |CANADA 
1580 +Therefore, (% style="color:#e74c3c" %)mapping(%%) different [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] having the same data structure to different parts of a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], i.e. in the direction from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], through the ordered concatenation notation is equivalent to a proper use of the operators “calc” and “union” on such [[datasets>>doc:sdmx:Glossary.Data set.WebHome]]. [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^~[39~]^^>>path:#_ftn39]](%%)[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^~[40~]^^>>path:#_ftn40]]
1808 1808  
1809 -It should be noted that the application of this many-to-one mapping from VTL to SDMX is equivalent to an appropriate sequence of VTL Transformations. These use the VTL operator “calc” to add the proper VTL  identifiers (in the example, INDICATOR and COUNTRY) and to assign to them the proper values and the operator “union” in order to obtain the final VTL dataset (in the example DF2(1.0)), that can be mapped one-to-one to the homonymous SDMX Dataflow.  Following the same example, these VTL transformations would be:
1582 +It is worth noting that in the direction from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] it is mandatory to specify the value for every [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] on which the (% style="color:#e74c3c" %)mapping(%%) is based (in other word, in the name of the calculated [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] is not possible to omit the value of some of the Dimensions).
1810 1810  
1811 -DF2bis_GDPPERCAPITA_USA    :=   ‘DF2(1.0)/GDPPERCAPITA.USA’
1812 -
1813 -[calc  identifier INDICATOR := ”GDPPERCAPITA”,  identifier  COUNTRY := ”USA”];
1814 -
1815 -DF2bis_GDPPERCAPITA_CANADA :=   ‘DF2(1.0)/GDPPERCAPITA.CANADA’   [calc  identifier INDICATOR:=”GDPPERCAPITA”,  identifier COUNTRY:=”CANADA”]; …   …   …
1816 -
1817 -DF2bis_POPGROWTH_USA     :=  ‘DF2(1.0)/POPGROWTH.USA’ 
1818 -
1819 -[calc  identifier INDICATOR := ”POPGROWTH”,  identifier  COUNTRY :=”USA”];
1820 -
1821 -DF2bis_POPGROWTH_CANADA’  :=  ‘DF2(1.0)/POPGROWTH.CANADA’
1822 -
1823 -[calc  identifier INDICATOR := ”POPGROWTH”,  identifier  COUNTRY := ”CANADA”]; …   …   …
1824 -
1825 -DF2(1.0)   <-   UNION          (DF2bis_GDPPERCAPITA_USA’,
1826 -
1827 -DF2bis_GDPPERCAPITA_CANADA’,
1828 -
1829 -… ,
1830 -
1831 -DF2bis_POPGROWTH_USA’,
1832 -
1833 -DF2bis_POPGROWTH_CANADA’ 
1834 -
1835 -…);
1836 -
1837 -In other words, starting from the datasets explicitly calculated through VTL (in the example ‘DF2(1.0)/GDPPERCAPITA.USA’ and so on), the first step consists in calculating other (non-persistent) VTL datasets (in the example DF2bis_GDPPERCAPITA_USA and so on) by adding the identifiers INDICATOR and COUNTRY with the desired values (//INDICATORvalue// and //COUNTRYvalue)//. Finally, all these non-persistent data sets are united and give the final result DF2(1.0)[[^^~[38~]^^>>path:#_ftn38]], which can be mapped one-to-one to the homonymous SDMX dataflow having the dimension components TIME_PERIOD, INDICATOR and COUNTRY.
1838 -
1839 -Therefore, mapping different VTL datasets having the same data structure to different parts of a SDMX dataflow, i.e. in the direction from VTL to SDMX, through the ordered concatenation notation is equivalent to a proper use of the operators “calc” and “union” on such datasets. [[^^~[39~]^^>>path:#_ftn39]][[^^~[40~]^^>>path:#_ftn40]]
1840 -
1841 -It is worth noting that in the direction from VTL to SDMX it is mandatory to specify the value for every Dimension on which the mapping is based (in other word, in the name of the calculated VTL dataset is not possible to omit the value of some of the Dimensions).
1842 -
1843 1843  === 10.3.7 Mapping variables and value domains between VTL and SDMX ===
1844 1844  
1845 -With reference to the VTL “model for Variables and Value domains”, the following additional mappings have to be considered:
1586 +With reference to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] “model for Variables and Value domains”, the following additional mappings have to be considered:
1846 1846  
1847 -|VTL|SDMX
1848 -|**Data Set Component**|Although this abstraction exists in SDMX, it does not have an explicit definition and correspond to a Component (either a Dimension or a PrimaryMeasure or a DataAttribute) belonging to one specific Dataflow^^42^^
1849 -|**Represented Variable**|**Concept** with  a definite Representation
1850 -|**Value Domain**|**Representation** (see the Structure Pattern in the Base Package)
1851 -|**Enumerated Value Domain / Code List**|(((
1852 -**Codelist** (for enumerated
1853 -
1854 -Dimension, PrimaryMeasure,
1855 -
1856 -DataAttribute) or **ConceptScheme**
1857 -
1858 -(for MeasureDimension)
1588 +(% style="width:890.835px" %)
1589 +|(% style="width:314px" %)VTL|(% style="width:574px" %)SDMX
1590 +|(% style="width:314px" %)**[[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] [[Component>>doc:sdmx:Glossary.Component.WebHome]]**|(% style="width:574px" %)Although this abstraction exists in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], it does not have an explicit definition and correspond to a [[Component>>doc:sdmx:Glossary.Component.WebHome]] (either a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] or a PrimaryMeasure or a DataAttribute) belonging to one specific [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]]^^42^^
1591 +|(% style="width:314px" %)**Represented Variable**|(% style="width:574px" %)(% style="color:#e74c3c" %)**Concept**(%%) with a definite [[Representation>>doc:sdmx:Glossary.Representation.WebHome]]
1592 +|(% style="width:314px" %)**Value Domain**|(% style="width:574px" %)**[[Representation>>doc:sdmx:Glossary.Representation.WebHome]]** (see the Structure Pattern in the Base Package)
1593 +|(% style="width:314px" %)**Enumerated Value Domain / [[Code List>>doc:sdmx:Glossary.Code list.WebHome]]**|(% style="width:574px" %)(((
1594 +**Codelist** (for enumerated [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], PrimaryMeasure, DataAttribute) or **ConceptScheme **(for MeasureDimension)
1859 1859  )))
1860 -|**Code**|**Code** (for enumerated Dimension, PrimaryMeasure, DataAttribute) or **Concept** (for MeasureDimension)
1861 -|**Described Value Domain**|(((
1862 -non-enumerated** Representation**
1863 -
1864 -(having Facets / ExtendedFacets, see the Structure Pattern in the Base Package)
1596 +|(% style="width:314px" %)**[[Code>>doc:sdmx:Glossary.Code.WebHome]]**|(% style="width:574px" %)**[[Code>>doc:sdmx:Glossary.Code.WebHome]]** (for enumerated [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], PrimaryMeasure, DataAttribute) or (% style="color:#e74c3c" %)**Concept**(%%) (for MeasureDimension)
1597 +|(% style="width:314px" %)**Described Value Domain**|(% style="width:574px" %)(((
1598 +non-enumerated** [[Representation>>doc:sdmx:Glossary.Representation.WebHome]] **(having [[Facets>>doc:sdmx:Glossary.Facet.WebHome]] / ExtendedFacets, see the Structure Pattern in the Base Package)
1865 1865  )))
1866 -|**Value**|(((
1867 -Although this abstraction exists in SDMX, it does not have an explicit definition and correspond to a **Code** of a
1868 -
1869 -Codelist (for enumerated
1870 -
1871 -Representations) or to a valid **value **(for non-enumerated** **
1872 -
1873 -Representations) or to a **Concept**
1874 -
1875 -(for MeasureDimension)
1600 +|(% style="width:314px" %)**Value**|(% style="width:574px" %)(((
1601 +Although this abstraction exists in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], it does not have an explicit definition and correspond to a **[[Code>>doc:sdmx:Glossary.Code.WebHome]]** of a Codelist (for enumerated [[Representations>>doc:sdmx:Glossary.Representation.WebHome]]) or to a valid **value **(for non-enumerated** **[[Representations>>doc:sdmx:Glossary.Representation.WebHome]]) or to a (% style="color:#e74c3c" %)**Concept**(%%)** **(for MeasureDimension)
1876 1876  )))
1877 -|**Value Domain Subset / Set**|This abstraction does not exist in SDMX
1878 -|**Enumerated Value Domain Subset / Enumerated Set**|This abstraction does not exist in SDMX
1879 -|**Described Value Domain Subset / Described Set**|This abstraction does not exist in SDMX
1880 -|**Set list**|This abstraction does not exist in SDMX
1603 +|(% style="width:314px" %)**Value Domain Subset / Set**|(% style="width:574px" %)This abstraction does not exist in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]
1604 +|(% style="width:314px" %)**Enumerated Value Domain Subset / Enumerated Set**|(% style="width:574px" %)This abstraction does not exist in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]
1605 +|(% style="width:314px" %)**Described Value Domain Subset / Described Set**|(% style="width:574px" %)This abstraction does not exist in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]
1606 +|(% style="width:314px" %)**Set list**|(% style="width:574px" %)This abstraction does not exist in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]
1881 1881  
1882 -The main difference between VTL and SDMX relies on the fact that the VTL artefacts for defining subsets of Value Domains do not exist in SDMX, therefore the VTL features for referring to predefined subsets are not available in SDMX. These artefacts are the Value Domain Subset (or Set), either enumerated or described, the Set List (list of values belonging to enumerated subsets) and the Data Set Component (aimed at defining the set of values that the Component of a Data Set can take, possibly a subset of the codes of Value Domain).
1608 +The main difference between [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] relies on the fact that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] for defining subsets of Value Domains do not exist in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], therefore the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] features for referring to predefined subsets are not available in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]. These [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] are the Value Domain Subset (or Set), either enumerated or described, the Set List (list of values belonging to enumerated subsets) and the [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] [[Component>>doc:sdmx:Glossary.Component.WebHome]] (aimed at defining the set of values that the [[Component>>doc:sdmx:Glossary.Component.WebHome]] of a [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] can take, possibly a subset of the [[codes>>doc:sdmx:Glossary.Code.WebHome]] of Value Domain).
1883 1883  
1884 -Another difference consists in the fact that all Value Domains are considered as identifiable objects in VTL either if enumerated or not, while in SDMX  the Codelist (corresponding to a VTL enumerated Value Domain) is identifiable, while the SDMX non-enumerated Representation (corresponding to a VTL non-enumerated Value
1610 +Another difference consists in the fact that all Value Domains are considered as identifiable objects in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] either if enumerated or not, while in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] the Codelist (corresponding to a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] enumerated Value Domain) is identifiable, while the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] non-enumerated [[Representation>>doc:sdmx:Glossary.Representation.WebHome]] (corresponding to a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] non-enumerated Value Domain) is not identifiable. As a consequence, the definition of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] rulesets, which in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] can refer either to enumerated or non-enumerated value domains, in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] can refer only to enumerated Value Domains (i.e. to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Codelists).
1885 1885  
1886 -Domain) is not identifiable. As a consequence, the definition of the VTL rulesets, which in VTL can refer either to enumerated or non-enumerated value domains, in SDMX can refer only to enumerated Value Domains (i.e. to SDMX Codelists). 
1612 +As for the (% style="color:#e74c3c" %)mapping(%%) between [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] variables and [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concepts(%%), it should be noted that these [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] do not coincide perfectly. In fact, the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] variables are represented variables, defined always on the same Value Domain (“[[Representation>>doc:sdmx:Glossary.Representation.WebHome]]” in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]) independently of the [[data set>>doc:sdmx:Glossary.Data set.WebHome]] / data structure in which they appear[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^~[41~]^^>>path:#_ftn41]](%%), while the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concepts(%%) can have different [[Representations>>doc:sdmx:Glossary.Representation.WebHome]] in different DataStructures.[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^~[42~]^^>>path:#_ftn42]](%%) This means that one [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concept(%%) can correspond to many [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Variables, one for each [[representation>>doc:sdmx:Glossary.Representation.WebHome]] the (% style="color:#e74c3c" %)Concept(%%) has.
1887 1887  
1888 -As for the mapping between VTL variables and SDMX Concepts, it should be noted that these artefacts do not coincide perfectly. In fact, the VTL variables are  represented variables, defined always on the same Value Domain (“Representation” in SDMX) independently of the data set / data structure in which they appear[[^^~[41~]^^>>path:#_ftn41]], while the SDMX Concepts can have different Representations in different DataStructures.[[^^~[42~]^^>>path:#_ftn42]] This means that one SDMX Concept can correspond to many VTL Variables, one for each representation the Concept has.
1614 +Therefore, it is important to be aware that some [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operations (for example the binary operations at [[data set>>doc:sdmx:Glossary.Data set.WebHome]] (% style="color:#e74c3c" %)level(%%)) are consistent only if the [[components>>doc:sdmx:Glossary.Component.WebHome]] having the same names in the operated [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] have also the same [[representation>>doc:sdmx:Glossary.Representation.WebHome]] (i.e. the same Value Domain as for [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]). For example, it is possible to obtain correct results from the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] expression
1889 1889  
1890 -Therefore, it is important to be aware that some VTL operations (for example the binary operations at data set level) are consistent only if the components having the same names in the operated VTL data sets have also the same representation (i.e. the same Value Domain as for VTL).   For example, it is possible to obtain correct results from the VTL expression
1616 +DS_c := DS_a + DS_b (where DS_a, DS_b, DS_c are VTL Data Sets)
1891 1891  
1892 - DS_c  :=  DS_a  +  DS_b  (where DS_a, DS_b, DS_c   are VTL Data Sets)
1618 +if the matching [[components>>doc:sdmx:Glossary.Component.WebHome]] in DS_a and DS_b (e.g. ref_date, geo_area, sector …) refer to the same general [[representation>>doc:sdmx:Glossary.Representation.WebHome]]. In simpler words, DS_a and DS_b must use the same values/[[codes>>doc:sdmx:Glossary.Code.WebHome]] (for ref_date, geo_area, sector … ), otherwise the relevant values would not match and the result of the operation would be wrong.
1893 1893  
1894 -if the matching components in DS_a and DS_b (e.g. ref_date, geo_area, sector …) refer to the same general representation. In simpler words, DS_a  and DS_b must use the same values/codes (for ref_date, geo_area, sector … ), otherwise the relevant values would not match and the result of the operation would be wrong.
1620 +As mentioned, the property above is not enforced by construction in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], and different [[representations>>doc:sdmx:Glossary.Representation.WebHome]] of the same (% style="color:#e74c3c" %)Concept(%%) can be not compatible one another (for example, it may happen that geo_area is represented by ISO-alpha-3 [[codes>>doc:sdmx:Glossary.Code.WebHome]] in DS_a and by ISO alpha-2 [[codes>>doc:sdmx:Glossary.Code.WebHome]] in DS_b). Therefore, it will be up to the definer of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations to ensure that the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] expressions are consistent with the actual [[representations>>doc:sdmx:Glossary.Representation.WebHome]] of the correspondent [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concepts(%%).
1895 1895  
1896 -As mentioned, the property above is not enforced by construction in SDMX, and different representations of the same Concept can be not compatible one another (for example, it may happen that geo_area is represented by ISO-alpha-3 codes in DS_a and by ISO alpha-2 codes in DS_b). Therefore, it will be up to the definer of VTL transformations to ensure that the VTL expressions are consistent with the actual representations of the correspondent SDMX Concepts.
1622 +It remains up to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]-[[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] definer also the assurance of the consistency between a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Ruleset defined on Variables and the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Components>>doc:sdmx:Glossary.Component.WebHome]] on which the Ruleset is applied. In fact, a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Ruleset is expressed by means of the values of the Variables (i.e. [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concepts(%%)), i.e. assuming definite [[representations>>doc:sdmx:Glossary.Representation.WebHome]] for them (e.g. ISO-alpha-3 for country). If the Ruleset is applied to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Components>>doc:sdmx:Glossary.Component.WebHome]] that have the same name of the (% style="color:#e74c3c" %)Concept(%%) they refer to but different [[representations>>doc:sdmx:Glossary.Representation.WebHome]] (e.g. ISO-alpha-2 for country), the Ruleset cannot work properly.
1897 1897  
1898 -It remains up to the SDMX-VTL definer also the assurance of the consistency between a VTL Ruleset defined on Variables  and the SDMX Components on which the Ruleset is applied.  In fact, a VTL Ruleset is expressed by means of the values of the Variables (i.e. SDMX Concepts), i.e. assuming definite representations for them (e.g. ISO-alpha-3 for country). If the Ruleset is applied to SDMX Components that have the same name of the Concept they refer to but different representations (e.g. ISO-alpha-2 for country), the Ruleset cannot work properly.
1899 -
1900 1900  == 10.4 Mapping between SDMX and VTL Data Types ==
1901 1901  
1902 1902  === 10.4.1 VTL Data types ===
1903 1903  
1904 -According to the VTL User Guide the possible operations in VTL depend on the data types of the artefacts. For example, numbers can be multiplied but text strings cannot. In the VTL Transformations, the compliance between the operators and the data types of their operands is statically checked, i.e., violations result in compiletime errors.
1628 +According to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] User Guide the possible operations in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] depend on the data types of the [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]]. For example, numbers can be multiplied but text strings cannot. In the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Transformations, the compliance between the operators and the data types of their operands is statically checked, i.e., violations result in compiletime errors.
1905 1905  
1906 -The VTL data types are sub-divided in scalar types (like integers, strings, etc.), which are the types of the scalar values, and compound types (like data sets, components, rulesets, etc.), which are the types of the compound structures. See below the diagram of the VTL data types, taken from the VTL User Manual:
1630 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data types are sub-divided in scalar types (like integers, strings, etc.), which are the types of the scalar values, and compound types (like [[data sets>>doc:sdmx:Glossary.Data set.WebHome]], [[components>>doc:sdmx:Glossary.Component.WebHome]], rulesets, etc.), which are the types of the compound structures. See below the diagram of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] data types, taken from the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] User Manual:
1907 1907  
1908 1908  [[image:1747836776716-178.png]]
1909 1909  
1910 1910  **Figure 12 – VTL Data Types**
1911 1911  
1912 -The VTL scalar types are in turn subdivided in basic scalar types, which are elementary (not defined in term of other data types) and Value Domain and Set scalar types, which are defined in terms of the basic scalar types.
1636 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] scalar types are in turn subdivided in basic scalar types, which are elementary (not defined in term of other data types) and Value Domain and Set scalar types, which are defined in terms of the basic scalar types.
1913 1913  
1914 -The VTL basic scalar types are listed below and follow a hierarchical structure in terms of supersets/subsets (e.g. “scalar” is the superset of all the basic scalar types):
1638 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar types are listed below and follow a hierarchical structure in terms of supersets/subsets (e.g. “scalar” is the superset of all the basic scalar types):
1915 1915  
1640 +[[image:1747859722732-549.png||height="283" width="224"]]
1916 1916  
1917 1917  **Figure 13 – VTL Basic Scalar Types**
1918 1918  
1919 1919  === 10.4.2 VTL basic scalar types and SDMX data types ===
1920 1920  
1921 -The VTL assumes that a basic scalar type has a unique internal representation and can have more external representations.
1646 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] assumes that a basic scalar type has a unique internal [[representation>>doc:sdmx:Glossary.Representation.WebHome]] and can have more external [[representations>>doc:sdmx:Glossary.Representation.WebHome]].
1922 1922  
1923 -The internal representation is the format used within a VTL system to represent (and process) all the scalar values of a certain type. In principle, this format is hidden and not necessarily known by users. The external representations are instead the external formats of the values of a certain basic scalar type, i.e. the formats known by the users. For example, the internal representation of the dates can be an integer counting the days since a predefined date (e.g. from 01/01/4713 BC up to 31/12/5874897 AD like in Postgres) while two possible external representations are the formats YYYY-MM-GG and MM-GG-YYYY (e.g. respectively 2010-12-31 and 1231-2010).
1648 +The internal [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is the format used within a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] system to represent (and process) all the scalar values of a certain type. In principle, this format is hidden and not necessarily known by users. The external [[representations>>doc:sdmx:Glossary.Representation.WebHome]] are instead the external formats of the values of a certain basic scalar type, i.e. the formats known by the users. For example, the internal [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of the dates can be an integer counting the days since a predefined date (e.g. from 01/01/4713 BC up to 31/12/5874897 AD like in Postgres) while two possible external [[representations>>doc:sdmx:Glossary.Representation.WebHome]] are the formats YYYY-MM-GG and MM-GG-YYYY (e.g. respectively 2010-12-31 and 1231-2010).
1924 1924  
1925 -The internal representation is the reference format that allows VTL to operate on more values of the same type (for example on more dates) even if such values have different external formats: these values are all converted to the unique internal representation so that they can be composed together (e.g. to find the more recent date, to find the time span between these dates and so on).
1650 +The internal [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is the reference format that allows [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to operate on more values of the same type (for example on more dates) even if such values have different external formats: these values are all converted to the unique internal [[representation>>doc:sdmx:Glossary.Representation.WebHome]] so that they can be composed together (e.g. to find the more recent date, to find the time span between these dates and so on).
1926 1926  
1927 -The VTL assumes that a unique internal representation exists for each basic scalar type but does not prescribe any particular format for it, leaving the VTL systems free to using they preferred or already existing internal format. By consequence, in VTL the basic scalar types are abstractions not associated to a specific format.
1652 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] assumes that a unique internal [[representation>>doc:sdmx:Glossary.Representation.WebHome]] exists for each basic scalar type but does not prescribe any particular format for it, leaving the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] systems free to using they preferred or already existing internal format. By consequence, in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] the basic scalar types are abstractions not associated to a specific format.
1928 1928  
1929 -SDMX data types are conceived instead to support the data exchange, therefore they do have a format, which is known by the users and correspond, in VTL terms, to external representations. Therefore, for each VTL basic scalar type there can be more SDMX data types (the latter are explained in the section “General Notes for Implementers” of this document and are actually much more numerous than the former).
1654 +[[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data types are conceived instead to support the data exchange, therefore they do have a format, which is known by the users and correspond, in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] terms, to external [[representations>>doc:sdmx:Glossary.Representation.WebHome]]. Therefore, for each [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar type there can be more [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data types (the latter are explained in the section “General Notes for Implementers” of this document and are actually much more numerous than the former).
1930 1930  
1931 -The following paragraphs describe the mapping between the SDMX data types and the VTL basic scalar types. This mapping shall be presented in the two directions of possible conversion, i.e. from SDMX to VTL and vice-versa.
1656 +The following paragraphs describe the mapping between the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data types and the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar types. This mapping shall be presented in the two directions of possible conversion, i.e. from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] and vice-versa.
1932 1932  
1933 -The conversion from SDMX to VTL happens when an SDMX artefact acts as inputs of a VTL transformation. As already said, in fact, at compile time the VTL needs to know the VTL type of the operands in order to check their compliance with the VTL operators and at runtime it must convert the values from their external (SDMX) representations to the corresponding internal (VTL) ones.
1658 +The conversion from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] happens when an [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] acts as inputs of a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformation. As already said, in fact, at compile time the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] needs to know the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] type of the operands in order to check their compliance with the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operators and at runtime it must convert the values from their external ([[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]) [[representations>>doc:sdmx:Glossary.Representation.WebHome]] to the corresponding internal ([[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]) ones.
1934 1934  
1935 -The opposite conversion, i.e. from VTL to SDMX, happens when a VTL result, i.e. a VTL data set output of a transformation, must become a SDMX artefact (or part of it). The values of the VTL result must be converted into the desired (SDMX) external representations (data types) of the SDMX artefact.
1660 +The opposite conversion, i.e. from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], happens when a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] result, i.e. a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] [[data set>>doc:sdmx:Glossary.Data set.WebHome]] output of a transformation, must become a [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] (or part of it). The values of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] result must be converted into the desired ([[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]) external [[representations>>doc:sdmx:Glossary.Representation.WebHome]] (data types) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]].
1936 1936  
1937 -=== 10.4.3 Mapping SDMX data types to VTL basic scalar types ===
1662 +=== 10.4.3 Mapping SDMX data types to VTL basic scalar types ===
1938 1938  
1939 -The following table describes the default mapping for converting from the SDMX data types to the VTL basic scalar types.
1664 +The following table describes the default mapping for converting from the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data types to the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar types.
1940 1940  
1941 -|**SDMX data type (BasicComponentDataType)**|**Default VTL basic scalar type**
1942 -|(((
1943 -**String   **
1944 -
1666 +(% style="width:653.835px" %)
1667 +|(% style="width:366px" %)**SDMX data type (BasicComponentDataType)**|(% style="width:284px" %)**Default [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar type**
1668 +|(% style="width:366px" %)(((
1669 +**String**
1945 1945  (string allowing any character)
1946 -)))|**string**
1947 -|(((
1948 -**Alpha    **
1949 -
1671 +)))|(% style="width:284px" %)**string**
1672 +|(% style="width:366px" %)(((
1673 +**Alpha**
1950 1950  (string which only allows A-z)
1951 -)))|**string**
1952 -|(((
1953 -**AlphaNumeric  **
1954 -
1675 +)))|(% style="width:284px" %)**string**
1676 +|(% style="width:366px" %)(((
1677 +**AlphaNumeric**
1955 1955  (string which only allows A-z and 0-9)
1956 -)))|**string**
1957 -|(((
1958 -**Numeric   **
1959 -
1679 +)))|(% style="width:284px" %)**string**
1680 +|(% style="width:366px" %)(((
1681 +**Numeric**
1960 1960  (string which only allows 0-9, but is not numeric so that is can having leading zeros)
1961 -)))|**string**
1962 -|(((
1963 -**BigInteger **
1964 -
1683 +)))|(% style="width:284px" %)**string**
1684 +|(% style="width:366px" %)(((
1685 +**BigInteger**
1965 1965  (corresponds to XML Schema xs:integer datatype; infinite set of integer values)
1966 -)))|**integer**
1967 -|(((
1968 -**Integer **
1969 -
1970 -(corresponds to XML Schema xs:int datatype; between
1971 -
1972 --2147483648 and +2147483647 (inclusive))
1973 -)))|**integer**
1974 -|(((
1975 -**Long **
1976 -
1977 -(corresponds to XML Schema xs:long datatype;
1978 -
1979 -between -9223372036854775808 and +9223372036854775807 (inclusive))
1980 -)))|**integer**
1981 -|(((
1982 -**Short **
1983 -
1687 +)))|(% style="width:284px" %)**integer**
1688 +|(% style="width:366px" %)(((
1689 +**Integer**
1690 +(corresponds to XML Schema xs:int datatype; between -2147483648 and +2147483647 (inclusive))
1691 +)))|(% style="width:284px" %)**integer**
1692 +|(% style="width:366px" %)(((
1693 +**Long**
1694 +(corresponds to XML Schema xs:long datatype; between -9223372036854775808 and +9223372036854775807 (inclusive))
1695 +)))|(% style="width:284px" %)**integer**
1696 +|(% style="width:366px" %)(((
1697 +**Short**
1984 1984  (corresponds to XML Schema xs:short datatype; between -32768 and -32767 (inclusive))
1985 -)))|**integer**
1986 -|(((
1987 -**Decimal**
1988 -
1989 -(corresponds to XML Schema xs:decimal datatype; subset of real numbers that can be represented as decimals)
1990 -)))|**number**
1991 -|(((
1992 -**Float **
1993 -
1699 +)))|(% style="width:284px" %)**integer**
1700 +|(% style="width:366px" %)(((
1701 +**[[Decimal>>doc:sdmx:Glossary.Decimals.WebHome]]**
1702 +(corresponds to XML Schema xs:[[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] datatype; subset of real numbers that can be represented as decimals)
1703 +)))|(% style="width:284px" %)**number**
1704 +|(% style="width:366px" %)(((
1705 +**Float**
1994 1994  (corresponds to XML Schema xs:float datatype; patterned after the IEEE single-precision 32-bit floating point type)
1995 -)))|**number**
1996 -|(((
1997 -**Double **
1998 -
1707 +)))|(% style="width:284px" %)**number**
1708 +|(% style="width:366px" %)(((
1709 +**Double**
1999 1999  (corresponds to XML Schema xs:double datatype; patterned after the IEEE double-precision 64-bit floating point type)
2000 -)))|**number**
2001 -|(((
2002 -**Boolean **
2003 -
2004 -(corresponds to the XML Schema xs:boolean datatype; support the mathematical concept of binary-valued logic: {true, false})
2005 -)))|**boolean**
2006 -|(((
2007 -**URI **
2008 -
1711 +)))|(% style="width:284px" %)**number**
1712 +|(% style="width:366px" %)(((
1713 +**Boolean**
1714 +(corresponds to the XML Schema xs:boolean datatype; support the mathematical (% style="color:#e74c3c" %)concept(%%) of binary-valued logic: {true, false})
1715 +)))|(% style="width:284px" %)**boolean**
1716 +|(% style="width:366px" %)(((
1717 +**URI**
2009 2009  (corresponds to the XML Schema xs:anyURI; absolute or relative Uniform Resource Identifier Reference)
2010 -)))|**string**
2011 -|(((
2012 -**Count   **
2013 -
1719 +)))|(% style="width:284px" %)**string**
1720 +|(% style="width:366px" %)(((
1721 +**Count**
2014 2014  (an integer following a sequential pattern, increasing by 1 for each occurrence)
2015 -)))|**integer**
2016 -|(((
2017 -**InclusiveValueRange **
2018 -
2019 -(decimal number within a closed interval, whose bounds are specified in the SDMX representation by the facets minValue and maxValue)
2020 -)))|**number**
2021 -|(((
2022 -**ExclusiveValueRange **
2023 -
2024 -(decimal number within an open interval, whose bounds are specified in the SDMX representation by the facets minValue and maxValue)
2025 -)))|**number**
2026 -|(((
2027 -**Incremental  **
2028 -
2029 -(decimal number the increased by a specific interval (defined by the interval facet), which is typically enforced outside of the XML validation)
2030 -)))|**number**
2031 -|(((
2032 -**ObservationalTimePeriod   **
2033 -
1723 +)))|(% style="width:284px" %)**integer**
1724 +|(% style="width:366px" %)(((
1725 +**InclusiveValueRange**
1726 +([[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] number within a closed interval, whose bounds are specified in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[representation>>doc:sdmx:Glossary.Representation.WebHome]] by the [[facets>>doc:sdmx:Glossary.Facet.WebHome]] minValue and maxValue)
1727 +)))|(% style="width:284px" %)**number**
1728 +|(% style="width:366px" %)(((
1729 +**ExclusiveValueRange**
1730 +([[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] number within an open interval, whose bounds are specified in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[representation>>doc:sdmx:Glossary.Representation.WebHome]] by the [[facets>>doc:sdmx:Glossary.Facet.WebHome]] minValue and maxValue)
1731 +)))|(% style="width:284px" %)**number**
1732 +|(% style="width:366px" %)(((
1733 +**Incremental **
1734 +([[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] number the increased by a specific interval (defined by the interval [[facet>>doc:sdmx:Glossary.Facet.WebHome]]), which is typically enforced outside of the XML validation)
1735 +)))|(% style="width:284px" %)**number**
1736 +|(% style="width:366px" %)(((
1737 +**ObservationalTimePeriod**
2034 2034  (superset of StandardTimePeriod and TimeRange)
2035 -)))|**time**
2036 -|(((
2037 -**StandardTimePeriod   **
2038 -
1739 +)))|(% style="width:284px" %)**time**
1740 +|(% style="width:366px" %)(((
1741 +**StandardTimePeriod**
2039 2039  (superset of BasicTimePeriod and ReportingTimePeriod)
2040 -)))|**time**
2041 -|(((
2042 -**BasicTimePeriod  **
2043 -
1743 +)))|(% style="width:284px" %)**time**
1744 +|(% style="width:366px" %)(((
1745 +**BasicTimePeriod**
2044 2044  (superset of GregorianTimePeriod and DateTime)
2045 -)))|**date**
2046 -|(((
2047 -**GregorianTimePeriod   **
2048 -
1747 +)))|(% style="width:284px" %)**date**
1748 +|(% style="width:366px" %)(((
1749 +**GregorianTimePeriod**
2049 2049  (superset of GregorianYear, GregorianYearMonth, and GregorianDay)
2050 -)))|**date**
2051 -|**GregorianYear     **(YYYY)  |**date**
2052 -|**GregorianYearMonth** / **GregorianMonth**    (YYYY-MM)|**date**
2053 -|**GregorianDay    **(YYYY-MM-DD)|**date**
2054 -|(((
1751 +)))|(% style="width:284px" %)**date**
1752 +|(% style="width:366px" %)**GregorianYear **(YYYY)|(% style="width:284px" %)**date**
1753 +|(% style="width:366px" %)**GregorianYearMonth** / **GregorianMonth** (YYYY-MM)|(% style="width:284px" %)**date**
1754 +|(% style="width:366px" %)**GregorianDay **(YYYY-MM-DD)|(% style="width:284px" %)**date**
1755 +|(% style="width:366px" %)(((
2055 2055  **ReportingTimePeriod **
2056 -
2057 -(superset of RepostingYear, ReportingSemester,
2058 -
2059 -ReportingTrimester, ReportingQuarter, ReportingMonth,
2060 -
2061 -ReportingWeek, ReportingDay)
2062 -)))|**time_period**
2063 -|(((
2064 -**ReportingYear   **
2065 -
1757 +(superset of RepostingYear, ReportingSemester, ReportingTrimester, ReportingQuarter, ReportingMonth, ReportingWeek, ReportingDay)
1758 +)))|(% style="width:284px" %)**time_period**
1759 +|(% style="width:366px" %)(((
1760 +**ReportingYear**
2066 2066  (YYYY-A1 – 1 year period)
2067 -)))|**time_period**
2068 -|(((
2069 -**ReportingSemester  **
2070 -
1762 +)))|(% style="width:284px" %)**time_period**
1763 +|(% style="width:366px" %)(((
1764 +**ReportingSemester**
2071 2071  (YYYY-Ss – 6 month period)
2072 -)))|**time_period**
2073 -|(((
2074 -**ReportingTrimester **
2075 -
1766 +)))|(% style="width:284px" %)**time_period**
1767 +|(% style="width:366px" %)(((
1768 +**ReportingTrimester**
2076 2076  (YYYY-Tt – 4 month period)
2077 -)))|**time_period**
2078 -|(((
2079 -**ReportingQuarter   **
2080 -
1770 +)))|(% style="width:284px" %)**time_period**
1771 +|(% style="width:366px" %)(((
1772 +**ReportingQuarter**
2081 2081  (YYYY-Qq – 3 month period)
2082 -)))|**time_period**
2083 -|(((
2084 -**ReportingMonth   **
2085 -
1774 +)))|(% style="width:284px" %)**time_period**
1775 +|(% style="width:366px" %)(((
1776 +**ReportingMonth**
2086 2086  (YYYY-Mmm – 1 month period)
2087 -)))|**time_period**
2088 -|(((
2089 -**ReportingWeek   **
2090 -
1778 +)))|(% style="width:284px" %)**time_period**
1779 +|(% style="width:366px" %)(((
1780 +**ReportingWeek**
2091 2091  (YYYY-Www – 7 day period; following ISO 8601 definition of a week in a year)
2092 -)))|**time_period**
2093 -|(((
2094 -**ReportingDay   **
2095 -
1782 +)))|(% style="width:284px" %)**time_period**
1783 +|(% style="width:366px" %)(((
1784 +**ReportingDay**
2096 2096  (YYYY-Dddd – 1 day period)
2097 -)))|**time_period**
2098 -|(((
2099 -**DateTime  **
2100 -
1786 +)))|(% style="width:284px" %)**time_period**
1787 +|(% style="width:366px" %)(((
1788 +**DateTime**
2101 2101  (YYYY-MM-DDThh:mm:ss)
2102 -)))|**date**
2103 -|(((
2104 -**TimeRange   **
1790 +)))|(% style="width:284px" %)**date**
1791 +|(% style="width:366px" %)(((
1792 +**TimeRange**
2105 2105  
2106 -(YYYY-MM-DD(Thh:mm:ss)?/<duration>)
2107 -)))|**time**
2108 -|(((
2109 -**Month   **
2110 -
2111 -(~-~-MM; speicifies a month independent of a year; e.g.
2112 -
2113 -February is black history month in the United States)
2114 -)))|**string**
2115 -|(((
2116 -**MonthDay   **
2117 -
2118 -(~-~-MM-DD; specifies a day within a month independent of a year; e.g. Christmas is December 25^^th^^;  used to specify reporting year start day)
2119 -)))|**string**
2120 -|(((
2121 -**Day   **
2122 -
2123 -(~-~--DD; specifies a day independent of a month or year; e.g. the 15^^th^^ is payday)
2124 -)))|**string**
2125 -|(((
2126 -**Time   **
2127 -
1794 +(YYYY-MM-DD(Thh:mm:ss)?/)
1795 +)))|(% style="width:284px" %)**time**
1796 +|(% style="width:366px" %)(((
1797 +**Month**
1798 +(MM; speicifies a month independent of a year; e.g. February is black history month in the United States)
1799 +)))|(% style="width:284px" %)**string**
1800 +|(% style="width:366px" %)(((
1801 +**MonthDay**
1802 +(MM-DD; specifies a day within a month independent of a year; e.g. Christmas is December 25^^th^^; used to specify reporting year start day)
1803 +)))|(% style="width:284px" %)**string**
1804 +|(% style="width:366px" %)(((
1805 +**Day**
1806 +(-DD; specifies a day independent of a month or year; e.g. the 15^^th^^ is payday)
1807 +)))|(% style="width:284px" %)**string**
1808 +|(% style="width:366px" %)(((
1809 +**Time**
2128 2128  (hh:mm:ss; time independent of a date; e.g. coffee break is at 10:00 AM)
2129 -)))|**string**
2130 -|(((
2131 -**Duration **
2132 -
1811 +)))|(% style="width:284px" %)**string**
1812 +|(% style="width:366px" %)(((
1813 +**Duration**
2133 2133  (corresponds to XML Schema xs:duration datatype)
2134 -)))|**duration**
2135 -|XHTML|Metadata type – not applicable
2136 -|KeyValues|Metadata type – not applicable
2137 -|IdentifiableReference|Metadata type – not applicable
2138 -|DataSetReference|Metadata type – not applicable
2139 -|AttachmentConstraintReference|Metadata type – not applicable
1815 +)))|(% style="width:284px" %)**duration**
1816 +|(% style="width:366px" %)XHTML|(% style="width:284px" %)Metadata type – not applicable
1817 +|(% style="width:366px" %)KeyValues|(% style="width:284px" %)Metadata type – not applicable
1818 +|(% style="width:366px" %)IdentifiableReference|(% style="width:284px" %)Metadata type – not applicable
1819 +|(% style="width:366px" %)DataSetReference|(% style="width:284px" %)Metadata type – not applicable
1820 +|(% style="width:366px" %)AttachmentConstraintReference|(% style="width:284px" %)Metadata type – not applicable
2140 2140  
2141 -
2142 -
2143 2143  **Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types**
2144 2144  
2145 -When VTL takes in input SDMX artefacts, it is assumed that a type conversion according to the table above always happens. In case a different VTL basic scalar type is desired, it can be achieved in the VTL program taking in input the default VTL basic scalar type above and applying to it the VTL type conversion features (see the implicit and explicit type conversion and the “cast” operator in the VTL Reference Manual).
1824 +When [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] takes in input [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]], it is assumed that a type conversion according to the table above always happens. In case a different [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar type is desired, it can be achieved in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] program taking in input the default [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar type above and applying to it the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] type conversion features (see the implicit and explicit type conversion and the “cast” operator in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Reference Manual).
2146 2146  
2147 -=== 10.4.4 Mapping VTL basic scalar types to SDMX data types ===
1826 +=== 10.4.4 Mapping VTL basic scalar types to SDMX data types ===
2148 2148  
2149 -The following table describes the default conversion from the VTL basic scalar types to the SDMX data types .
1828 +The following table describes the default conversion from the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar types to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data types .
2150 2150  
2151 -|**VTL basic scalar type**|**Default SDMX data type (BasicComponentDataType)**|**Default output format**
2152 -|**String**|**String **|Like XML (xs:string)
2153 -|**Number**|**Float **|Like XML (xs:float)
2154 -|**Integer**|**Integer **|Like XML (xs:int)
2155 -|**Date**|**DateTime**|YYYY-MM-DDT00:00:00Z
2156 -|**Time**|**StandardTimePeriod**|<date>/<date> (as defined above)
2157 -|**time_period**|(((
2158 -**ReportingTimePeriod**
2159 -
2160 -**(StandardReportingPeriod)**
2161 -)))|(((
1830 +(% style="width:923.835px" %)
1831 +|(% style="width:191px" %)**VTL basic scalar type**|(% style="width:419px" %)**Default SDMX data type (BasicComponentDataType)**|(% style="width:311px" %)**Default output format**
1832 +|(% style="width:191px" %)**String**|(% style="width:419px" %)**String **|(% style="width:311px" %)Like XML (xs:string)
1833 +|(% style="width:191px" %)**Number**|(% style="width:419px" %)**Float **|(% style="width:311px" %)Like XML (xs:float)
1834 +|(% style="width:191px" %)**Integer**|(% style="width:419px" %)**Integer **|(% style="width:311px" %)Like XML (xs:int)
1835 +|(% style="width:191px" %)**Date**|(% style="width:419px" %)**DateTime**|(% style="width:311px" %)YYYY-MM-DDT00:00:00Z
1836 +|(% style="width:191px" %)**Time**|(% style="width:419px" %)**StandardTimePeriod**|(% style="width:311px" %)/ (as defined above)
1837 +|(% style="width:191px" %)**time_period**|(% style="width:419px" %)(((
1838 +**ReportingTimePeriod
1839 +(StandardReportingPeriod)**
1840 +)))|(% style="width:311px" %)(((
2162 2162   YYYY-Pppp
2163 -
2164 -(according to SDMX )
1842 +(according to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] )
2165 2165  )))
2166 -|**Duration**|**Duration **|(((
1844 +|(% style="width:191px" %)**Duration**|(% style="width:419px" %)**Duration **|(% style="width:311px" %)(((
2167 2167  Like XML (xs:duration)
2168 -
2169 2169  PnYnMnDTnHnMnS
2170 2170  )))
2171 -|**Boolean**|**Boolean **|(((
2172 -Like XML (xs:boolean) with the values
2173 -
2174 -“true” or “false”
1848 +|(% style="width:191px" %)**Boolean**|(% style="width:419px" %)**Boolean **|(% style="width:311px" %)(((
1849 +Like XML (xs:boolean) with the values “true” or “false”
2175 2175  )))
2176 2176  
2177 -**Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types**
1852 +**Figure 14 – Mappings from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data types to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Basic Scalar Types**
2178 2178  
2179 -In case a different default conversion is desired, it can be achieved through the
1854 +In case a different default conversion is desired, it can be achieved through the CustomTypeScheme and CustomType [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] (see also the section Transformations and Expressions of the [[SDMX information model>>doc:sdmx:Glossary.SDMX Information Model.WebHome]]).
2180 2180  
2181 -CustomTypeScheme and CustomType artefacts (see also the section Transformations and Expressions of the SDMX information model).
1856 +The custom output formats can be specified by means of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] formatting mask described in the section “Type Conversion and Formatting Mask” of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Reference Manual. Such a section describes the masks for the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar types “number”, “integer”, “date”, “time”, “time_period” and “duration” and gives examples. As for the types “string” and “boolean” the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] conventions are extended with some other special characters as described in the following table.
2182 2182  
2183 -The custom output formats can be specified by means of the VTL formatting mask described in the section “Type Conversion and Formatting Mask” of the VTL Reference Manual. Such a section describes the masks for the VTL basic scalar types “number”, “integer”, “date”, “time”, “time_period” and “duration” and gives examples. As for the types “string” and “boolean” the VTL conventions are extended with some other special characters as described in the following table.
1858 +(% style="width:671.835px" %)
1859 +|(% colspan="2" style="width:669px" %)**VTL special characters for the formatting masks**
1860 +|(% colspan="2" style="width:669px" %)** **
1861 +|(% colspan="2" style="width:669px" %)**Number **
1862 +|(% style="width:141px" %)D|(% style="width:528px" %)one numeric digit (if the scientific notation is adopted, D is only for the mantissa)
1863 +|(% style="width:141px" %)E|(% style="width:528px" %)one numeric digit (for the exponent of the scientific notation)
1864 +|(% style="width:141px" %).(dot)|(% style="width:528px" %)possible separator between the integer and the [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] parts.
1865 +|(% style="width:141px" %),(comma)|(% style="width:528px" %)possible separator between the integer and the [[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] parts.
1866 +|(% style="width:141px" %) |(% style="width:528px" %)
1867 +|(% colspan="2" style="width:669px" %)**Time and duration**
1868 +|(% style="width:141px" %)C |(% style="width:528px" %)century
1869 +|(% style="width:141px" %)Y|(% style="width:528px" %)year
1870 +|(% style="width:141px" %)S|(% style="width:528px" %)semester
1871 +|(% style="width:141px" %)Q|(% style="width:528px" %)quarter
1872 +|(% style="width:141px" %)M|(% style="width:528px" %)month
1873 +|(% style="width:141px" %)W|(% style="width:528px" %)week
1874 +|(% style="width:141px" %)D|(% style="width:528px" %)day
1875 +|(% style="width:141px" %)h |(% style="width:528px" %)hour digit (by default on 24 hours)
1876 +|(% style="width:141px" %)M|(% style="width:528px" %)minute
1877 +|(% style="width:141px" %)S|(% style="width:528px" %)second
1878 +|(% style="width:141px" %)D|(% style="width:528px" %)[[decimal>>doc:sdmx:Glossary.Decimals.WebHome]] of second
1879 +|(% style="width:141px" %)P|(% style="width:528px" %)period indicator (representation in one digit for the duration)
1880 +|(% style="width:141px" %)P|(% style="width:528px" %)number of the periods specified in the period indicator
1881 +|(% style="width:141px" %)AM/PM |(% style="width:528px" %)indicator of AM / PM (e.g. am/pm for “am” or “pm”)
1882 +|(% style="width:141px" %)MONTH|(% style="width:528px" %)uppercase textual representation of the month (e.g., JANUARY for January)
1883 +|(% style="width:141px" %)DAY|(% style="width:528px" %)uppercase textual representation of the day (e.g., MONDAY for Monday)
1884 +|(% style="width:141px" %)Month|(% style="width:528px" %)lowercase textual representation of the month (e.g., january)
1885 +|(% style="width:141px" %)Day|(% style="width:528px" %)lowercase textual representation of the month (e.g., monday)
1886 +|(% style="width:141px" %)Month|(% style="width:528px" %)First character uppercase, then lowercase textual representation of the month (e.g., January)
1887 +|(% style="width:141px" %)Day|(% style="width:528px" %)First character uppercase, then lowercase textual [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of the day using (e.g. Monday)
1888 +|(% style="width:141px" %) |(% style="width:528px" %)
1889 +|(% colspan="2" style="width:669px" %)**String**
1890 +|(% style="width:141px" %)X|(% style="width:528px" %)any string character
1891 +|(% style="width:141px" %)Z|(% style="width:528px" %)any string character from “A” to “z”
1892 +|(% style="width:141px" %)9|(% style="width:528px" %)any string character from “0” to “9”
1893 +|(% style="width:141px" %) |(% style="width:528px" %)
1894 +|(% colspan="2" style="width:669px" %)**Boolean **
1895 +|(% style="width:141px" %)B|(% style="width:528px" %)Boolean using “true” for True and “false” for False
1896 +|(% style="width:141px" %)1|(% style="width:528px" %)Boolean using “1” for True and “0” for False
1897 +|(% style="width:141px" %)0|(% style="width:528px" %)Boolean using “0” for True and “1” for False
1898 +|(% style="width:141px" %) |(% style="width:528px" %)
1899 +|(% colspan="2" style="width:669px" %)Other qualifiers
1900 +|(% style="width:141px" %)*|(% style="width:528px" %)an arbitrary number of digits (of the preceding type)
1901 +|(% style="width:141px" %)+|(% style="width:528px" %)at least one digit (of the preceding type)
1902 +|(% style="width:141px" %)( )|(% style="width:528px" %)optional digits (specified within the brackets)
1903 +|(% style="width:141px" %)\|(% style="width:528px" %)prefix for the special characters that must appear in the mask
1904 +|(% style="width:141px" %)N|(% style="width:528px" %)fixed number of digits used in the preceding textual [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of the month or the day
1905 +|(% style="width:141px" %) |(% style="width:528px" %)
2184 2184  
2185 -|(% colspan="2" %)**VTL special characters for the formatting masks**
2186 -|(% colspan="2" %)** **
2187 -|(% colspan="2" %)**Number **
2188 -|D|one numeric digit (if the scientific notation is adopted, D is only for the mantissa)
2189 -|E|one numeric digit (for the exponent of the scientific notation)
2190 -|.    (dot)|possible separator between the integer and the decimal parts.
2191 -|,   (comma)|possible separator between the integer and the decimal parts.
2192 -| |
2193 -|(% colspan="2" %)**Time and duration**
2194 -|C |century
2195 -|Y|year
2196 -|S|semester
2197 -|Q|quarter
2198 -|M|month
2199 -|W|week
2200 -|D|day
2201 -|h |hour digit (by default on 24 hours)
2202 -|M|minute
2203 -|S|second
2204 -|D|decimal of second
2205 -|P|period indicator (representation in one digit for the duration)
2206 -|P|number of the periods specified in the period indicator
2207 -|AM/PM |indicator of AM / PM (e.g. am/pm for “am” or “pm”)
2208 -|MONTH|uppercase textual representation of the month (e.g., JANUARY for January)
2209 -|DAY|uppercase textual representation of the day (e.g., MONDAY for Monday)
2210 -|Month|lowercase textual representation of the month (e.g., january)
2211 -|Day|lowercase textual representation of the month (e.g., monday)
2212 -|Month|First character uppercase, then lowercase textual representation of the month (e.g., January)
2213 -|Day|First character uppercase, then lowercase textual representation of the day using (e.g. Monday)
2214 -| |
2215 -|(% colspan="2" %)**String  **
2216 -|X|any string character
2217 -|Z|any string character from “A” to “z”
2218 -|9|any string character from “0” to “9”
2219 -| |
2220 -|(% colspan="2" %)**Boolean **
2221 -|B|Boolean using “true” for True and “false” for False
2222 -|1|Boolean using “1” for True and “0” for False
2223 -|0|Boolean using “0” for True and “1” for False
2224 -| |
2225 -|(% colspan="2" %)Other qualifiers
2226 -|*|an arbitrary number of digits (of the preceding type)
2227 -|+|at least one digit (of the preceding type)
2228 -|( )|optional digits (specified within the brackets)
2229 -|\|prefix for the special characters that must appear in the mask
2230 -|N|fixed number of digits used in the preceding  textual representation of the month or the day
2231 -| |
1907 +The default conversion, either standard or customized, can be used to deduce automatically the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of the [[components>>doc:sdmx:Glossary.Component.WebHome]] of the result of a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformation. In alternative, the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of the resulting [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] can be given explicitly by providing its DataStructureDefinition. In other words, the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] specified in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]], if available, overrides any default conversion[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^~[43~]^^>>path:#_ftn43]](%%).
2232 2232  
2233 -The default conversion, either standard or customized, can be used to deduce automatically the representation of the components of the result of a VTL transformation. In alternative, the representation of the resulting SDMX Dataflow can be given explicitly by providing its DataStructureDefinition. In other words, the representation specified in the DSD, if available, overrides any default conversion[[^^~[43~]^^>>path:#_ftn43]].
2234 -
2235 2235  === 10.4.5 Null Values ===
2236 2236  
2237 -In the conversions from SDMX to VTL it is assumed by default that a missing value in SDMX becomes a NULL in VTL. After the conversion, the NULLs can be manipulated through the proper VTL operators.
1911 +In the conversions from [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] it is assumed by default that a missing value in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] becomes a NULL in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]]. After the conversion, the NULLs can be manipulated through the proper [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] operators.
2238 2238  
2239 -On the other side, the VTL programs can produce in output NULL values for Measures and Attributes (Null values are not allowed in the Identifiers). In the conversion from VTL to SDMX, it is assumed that a NULL in VTL becomes a missing value in SDMX.
1913 +On the other side, the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] programs can produce in output NULL values for [[Measures>>doc:sdmx:Glossary.Measure.WebHome]] and [[Attributes>>doc:sdmx:Glossary.Attribute.WebHome]] (Null values are not allowed in the Identifiers). In the conversion from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], it is assumed that a NULL in [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] becomes a missing value in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].
2240 2240  
2241 -In the conversion from VTL to SDMX, the default assumption can be overridden, separately for each VTL basic scalar type, by specifying which the value that represents the NULL in SDMX is. This can be specified in the attribute “nullValue” of the CustomType artefact (see also the section Transformations and Expressions of the SDMX information model). A CustomType belongs to a CustomTypeScheme, which can be referenced by one or more  TransformationScheme (i.e. VTL programs). The overriding assumption is applied for all the SDMX Dataflows calculated in the TransformationScheme.
1915 +In the conversion from [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], the default assumption can be overridden, separately for each [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar type, by specifying which the value that represents the NULL in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] is. This can be specified in the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] “nullValue” of the CustomType [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] (see also the section Transformations and Expressions of the [[SDMX information model>>doc:sdmx:Glossary.SDMX Information Model.WebHome]]). A CustomType belongs to a CustomTypeScheme, which can be referenced by one or more TransformationScheme (i.e. [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] programs). The overriding assumption is applied for all the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] calculated in the TransformationScheme.
2242 2242  
2243 2243  === 10.4.6 Format of the literals used in VTL transformations ===
2244 2244  
2245 -The VTL programs can contain literals, i.e. specific values of certain data types written directly in the VTL definitions or expressions. The VTL does not prescribe a specific format for the literals and leave the specific VTL systems and the definers of VTL transformations free of using their preferred formats.
1919 +The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] programs can contain literals, i.e. specific values of certain data types written directly in the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] definitions or expressions. The [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] does not prescribe a specific format for the literals and leave the specific [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] systems and the definers of [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] transformations free of using their preferred formats.
2246 2246  
2247 -Given this discretion, it is essential to know which are the external representations adopted for the literals in a VTL program, in order to interpret them correctly.  For example, if the external format for the dates is YYYY-MM-DD the date literal 201001-02 has the meaning of 2^^nd^^ January 2010, instead if the external format for the dates is YYYY-DD-MM the same literal has the meaning of 1^^st^^ February 2010.
1921 +Given this discretion, it is essential to know which are the external [[representations>>doc:sdmx:Glossary.Representation.WebHome]] adopted for the literals in a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] program, in order to interpret them correctly. For example, if the external format for the dates is YYYY-MM-DD the date literal 201001-02 has the meaning of 2^^nd^^ January 2010, instead if the external format for the dates is YYYY-DD-MM the same literal has the meaning of 1^^st^^ February 2010.
2248 2248  
2249 -Hereinafter, i.e. in the SDMX implementation of the VTL, it is assumed that the literals are expressed according to the “default output format” of the table of the previous paragraph (“Mapping VTL basic scalar types to SDMX data types”) unless otherwise specified.
1923 +Hereinafter, i.e. in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] implementation of the [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]], it is assumed that the literals are expressed according to the “default output format” of the table of the previous paragraph (“Mapping [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar types to [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] data types”) unless otherwise specified.
2250 2250  
2251 -A different format can be specified in the attribute “vtlLiteralFormat” of the CustomType artefact (see also the section Transformations and Expressions of the SDMX information model).
1925 +A different format can be specified in the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] “vtlLiteralFormat” of the CustomType [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] (see also the section Transformations and Expressions of the [[SDMX information model>>doc:sdmx:Glossary.SDMX Information Model.WebHome]]).
2252 2252  
2253 -Like in the case of the conversion of NULLs described in the previous paragraph, the overriding assumption is applied, for a certain VTL basic scalar type, if a value is found for the vtlLiteralFormat attribute of the CustomType of such VTL basic scalar type. The overriding assumption is applied for all the literals of a related VTL
1927 +Like in the case of the conversion of NULLs described in the previous paragraph, the overriding assumption is applied, for a certain [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar type, if a value is found for the vtlLiteralFormat [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] of the CustomType of such [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] basic scalar type. The overriding assumption is applied for all the literals of a related [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] TransformationScheme.
2254 2254  
2255 -TransformationScheme.
1929 +In case a literal is operand of a [[VTL>>doc:sdmx:Glossary.Validation and transformation language.WebHome]] Cast operation, the format specified in the Cast overrides all the possible otherwise specified formats.
2256 2256  
2257 -In case a literal is operand of a VTL Cast operation, the format specified in the Cast overrides all the possible otherwise specified formats.
2258 -
2259 2259  = 11 Annex I: How to eliminate extra element in the .NET SDMX Web Service =
2260 2260  
2261 2261  == 11.1 Problem statement ==
2262 2262  
2263 -For implementing an SDMX compliant Web Service the standardised WSDL file should be used that describes the expected request/response structure. The request message of the operation contains a wrapper element (e.g. “GetGenericData”) that wraps a tag called “GenericDataQuery”, which is the actual SDMX query XML message that contains the query to be processed by the Web Service. In the same way the response is formulated in a wrapper element “GetGenericDataResponse”.
1935 +For implementing an [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] compliant Web Service the standardised WSDL file should be used that describes the expected request/response structure. The request message of the operation contains a wrapper element (e.g. “GetGenericData”) that wraps a tag called “GenericDataQuery”, which is the actual [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] query XML message that contains the query to be processed by the Web Service. In the same way the response is formulated in a wrapper element “GetGenericDataResponse”.
2264 2264  
2265 -As defined in the SOAP specification, the root element of a SOAP message is the Envelope, which contains an optional Header and a mandatory Body. These are illustrated below along with the Body contents according to the WSDL:
1937 +As defined in the SOAP specification, the root element of a SOAP message is the Envelope, which contains an optional Header and a mandatory Body. These are illustrated below along with the Body contents according to the WSDL:
2266 2266  
1939 +[[image:1747854006117-843.png]]
1940 +
2267 2267  The problem that initiated the present analysis refers to the difference in the way SOAP requests are when trying to implement the aforementioned Web Service in .NET framework.
2268 2268  
2269 -Building such a Web Service using the .NET framework is done by exposing a method (i.e. the getGenericData in the example) with an XML document argument (lets name it “Query”). **The difference that appears in Microsoft .Net implementations is that there is a need for an extra XML container around the SDMX GenericDataQuery.** This is the expected behavior since the framework is let to publish automatically the Web Service as a remote procedure call, thus wraps each parameter into an extra element. The .NET request is illustrated below:
1943 +Building such a Web Service using the .NET framework is done by exposing a method (i.e. the getGenericData in the example) with an XML document argument (lets name it “Query”). **The difference that appears in Microsoft .Net implementations is that there is a need for an extra XML container around the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] GenericDataQuery.** This is the expected behavior since the framework is let to publish automatically the Web Service as a remote procedure call, thus wraps each parameter into an extra element. The .NET request is illustrated below:
2270 2270  
1945 +[[image:1747854039499-443.png]]
1946 +
1947 +[[image:1747854067769-691.png]]
1948 +
2271 2271  Furthermore this extra element is also inserted in the automatically generated WSDL from the framework. Therefore this particularity requires custom clients for the .NET Web Services that is not an interoperable solution.
2272 2272  
2273 2273  == 11.2 Solution ==
2274 2274  
2275 -The solution proposed for conforming the .NET implementation to the envisioned SOAP requests has to do with the manual intervention to the serialisation and deserialisation of the XML payloads. Since it is a Web Service of already prepared XML messages requests/responses this is the indicate way so as to have full control on the XML messages. This is the way the Java implementation (using Apache Axis) of the SDMX Web Service has adopted.
1953 +The solution proposed for conforming the .NET implementation to the envisioned SOAP requests has to do with the manual intervention to the serialisation and deserialisation of the XML payloads. Since it is a Web Service of already prepared XML messages requests/responses this is the indicate way so as to have full control on the XML messages. This is the way the Java implementation (using Apache Axis) of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Web Service has adopted.
2276 2276  
2277 2277  As regards the .NET platform this is related with the usage of **XmlAnyElement** parameter for the .NET web methods.
2278 2278  
... ... @@ -2280,31 +2280,41 @@
2280 2280  
2281 2281  [[image:1747836776717-914.jpeg]]
2282 2282  
2283 -The XML is passed to the XmlSerializer to de-serialize it into the instances of classes in managed code that map to the input parameters for the Web method. Likewise, the output parameters and return values of the Web method are serialized into XML in order to create the body of the SOAP response message.
1961 +The XML is passed to the XmlSerializer to de-serialize it into the instances of classes in managed [[code>>doc:sdmx:Glossary.Code.WebHome]] that (% style="color:#e74c3c" %)map(%%) to the input parameters for the Web method. Likewise, the output parameters and return values of the Web method are serialized into XML in order to create the body of the SOAP response message.
2284 2284  
2285 2285  In case the developer wants more control over the serialization and de-serialization process a solution is represented by the usage of **XmlElement** parameters. This offers the opportunity of validating the XML against a schema before de-serializing it, avoiding de-serialization in the first place, analyzing the XML to determine how you want to de-serialize it, or using the many powerful XML APIs that are available to deal with the XML directly. This also gives the developer the control to handle errors in a particular way instead of using the faults that the XmlSerializer might generate under the covers.
2286 2286  
2287 2287  In order to control the de-serialization process of the XmlSerializer for a Web method, **XmlAnyElement** is a simple solution to use.
2288 2288  
2289 -To understand how the **XmlAnyElement** attribute works we present the following two web methods:
1967 +To understand how the **XmlAnyElement** [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] works we present the following two web methods:
2290 2290  
2291 -In this method the **input** parameter is decorated with the **XmlAnyElement** parameter. This is a hint that this parameter will be de-serialized from an **xsd:any** element. Since the attribute is not passed any parameters, it means that the entire XML element for this parameter in the SOAP message will be in the Infoset that is represented by this **XmlElement** parameter.
1969 +[[image:1747854096778-844.png]]
2292 2292  
2293 -The difference between the two is that for the first method, **SubmitXml**, the
1971 +In this method the **input** parameter is decorated with the **XmlAnyElement** parameter. This is a hint that this parameter will be de-serialized from an **xsd:any** element. Since the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is not passed any parameters, it means that the entire XML element for this parameter in the SOAP message will be in the Infoset that is represented by this **XmlElement** parameter.
2294 2294  
2295 -XmlSerializer will expect an element named **input** to be an immediate child of the **SubmitXml** element in the SOAP body. The second method, **SubmitXmlAny**, will not care what the name of the child of the **SubmitXmlAny** element is. It will plug whatever XML is included into the input parameter. The message style from ASP.NET Help for the two methods is shown below. First we look at the message for the method without the **XmlAnyElement** attribute.
1973 +[[image:1747854127303-270.png]]
2296 2296  
2297 -Now we look at the message for the method that uses the **XmlAnyElement** attribute.
1975 +The difference between the two is that for the first method, **SubmitXml**, the XmlSerializer will expect an element named **input** to be an immediate child of the **SubmitXml** element in the SOAP body. The second method, **SubmitXmlAny**, will not care what the name of the child of the **SubmitXmlAny** element is. It will plug whatever XML is included into the input parameter. The message style from ASP.NET Help for the two methods is shown below. First we look at the message for the method without the **XmlAnyElement** [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]].
2298 2298  
2299 -The method decorated with the **XmlAnyElement** attribute has one fewer wrapping elements. Only an element with the name of the method wraps what is passed to the **input** parameter.
1977 +[[image:1747854163928-581.png]]
2300 2300  
2301 -For more information please consult:  [[http:~~/~~/msdn.microsoft.com/en>>url:http://msdn.microsoft.com/en-us/library/aa480498.aspx]][[->>url:http://msdn.microsoft.com/en-us/library/aa480498.aspx]][[us/library/aa480498.aspx>>url:http://msdn.microsoft.com/en-us/library/aa480498.aspx]][[url:http://msdn.microsoft.com/en-us/library/aa480498.aspx]]
1979 +Now we look at the message for the method that uses the **XmlAnyElement** [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]].
2302 2302  
1981 +[[image:1747854190641-364.png]]
1982 +
1983 +[[image:1747854236732-512.png]]
1984 +
1985 +The method decorated with the **XmlAnyElement** [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] has one fewer wrapping elements. Only an element with the name of the method wraps what is passed to the **input** parameter.
1986 +
1987 +For more information please consult: [[http:~~/~~/msdn.microsoft.com/en-us/library/aa480498.aspx>>http://msdn.microsoft.com/en-us/library/aa480498.aspx]]
1988 +
2303 2303  Furthermore at this point the problem with the different requests has been solved. However there is still the difference in the produced WSDL that has to be taken care. The automatic generated WSDL now doesn’t insert the extra element, but defines the content of the operation wrapper element as “xsd:any” type.
2304 2304  
1991 +[[image:1747854286398-614.png]]
1992 +
2305 2305  Without a common WSDL still the solution doesn’t enforce interoperability. In order to
2306 2306  
2307 -“fix” the WSDL, there two approaches. The first is to intervene in the generation process. This is a complicated approach, compared to the second approach, which overrides the generation process and returns the envisioned WSDL for the SDMX Web Service.
1995 +“fix” the WSDL, there two approaches. The first is to intervene in the generation process. This is a complicated approach, compared to the second approach, which overrides the generation process and returns the envisioned WSDL for the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Web Service.
2308 2308  
2309 2309  This is done by redirecting the request to the “/Service?WSDL” to the envisioned WSDL stored locally into the application. To do this, from the project add a “Global Application Class” item (.asax file) and override the request in the “Application_BeginRequest” method. This is demonstrated in detail in the next section.
2310 2310  
... ... @@ -2312,107 +2312,29 @@
2312 2312  
2313 2313  == 11.3 Applying the solution ==
2314 2314  
2315 -In the context of the SDMX Web Service, applying the above solution translates into the following:
2003 +In the context of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Web Service, applying the above solution translates into the following:
2316 2316  
2005 +[[image:1747854385465-132.png]]
2006 +
2317 2317  The SOAP request/response will then be as follows:
2318 2318  
2319 2319  **GenericData Request**
2320 2320  
2011 +[[image:1747854406014-782.png]]
2012 +
2321 2321  **GenericData Response**
2322 2322  
2323 -For overriding the automatically produced WSDL, in the solution explorer right click the project and select “Add” -> “New item…”. Then select the “Global Application Class”. This will create “.asax” class file in which the following code should replace the existing empty method:
2015 +[[image:1747854424488-855.png]]
2324 2324  
2325 -The SDMX_WSDL.wsdl should reside in the in the root directory of the application. After applying this solution the returned WSDL is the envisioned. Thus in the request message definition contains:
2017 +For overriding the automatically produced WSDL, in the solution explorer right click the project and select “Add” -> “New item…”. Then select the “Global Application Class”. This will create “.asax” class file in which the following [[code>>doc:sdmx:Glossary.Code.WebHome]] should replace the existing empty method:
2326 2326  
2019 +[[image:1747854453895-524.png]]
2327 2327  
2328 -----
2021 +[[image:1747854476631-125.png]]
2329 2329  
2330 -[[~[1~]>>path:#_ftnref1]] The seconds can be reported fractionally
2023 +The SDMX_WSDL.wsdl should reside in the in the root directory of the application. After applying this solution the returned WSDL is the envisioned. Thus in the request message definition contains:
2331 2331  
2332 -[[~[2~]>>path:#_ftnref2]] ISO 8601 defines alternative definitions for the first week, all of which produce equivalent results. Any of these definitions could be substituted so long as they are in relation to the reporting year start day.
2025 +[[image:1747854493363-776.png]]
2333 2333  
2334 -[[~[3~]>>path:#_ftnref3]] The rules for adding durations to a date time are described in the W3C XML Schema specification. See [[http:~~/~~/www.w3.org/TR/xmlschema>>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[->>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[2/#adding>>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[->>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[durations>>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[->>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[to>>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[dateTimes>>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]][[ >>url:http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes]]for further details.
2335 2335  
2336 -[[~[4~]>>path:#_ftnref4]] The Validation and Transformation Language is a standard language designed and published under the SDMX initiative. VTL is described in the VTL User and Reference Guides available on the SDMX website [[https:~~/~~/sdmx.org>>url:https://sdmx.org/]][[.>>url:https://sdmx.org/]]
2337 -
2338 -[[~[5~]>>path:#_ftnref5]] See also the section “VTL-DL Rulesets” in the VTL Reference Manual.
2339 -
2340 -[[~[6~]>>path:#_ftnref6]] The VTLMapping are used also for User Defined Operators (UDO). Although UDOperators are envisaged to be defined on generic operands, so that the specific artefacts to be manipulated are passed as parameters at their invocation, it is also possible that an UDOperator invokes directly some specific SDMX artefacts. These SDMX artefacts have to be mapped to the corresponding aliases used in the definition of the UDO through the VtlMappingScheme and VtlMapping classes as well.
2341 -
2342 -[[~[7~]>>path:#_ftnref7]] For a complete description of the structure of the URN see the SDMX 2.1 Standards - Section 5 - Registry Specifications, paragraph 6.2.2 (“Universal Resource Name (URN)”).
2343 -
2344 -[[~[8~]>>path:#_ftnref8]] The container-object-id can repeat and may not be present.
2345 -
2346 -[[~[9~]>>path:#_ftnref9]] i.e., the artefact belongs to a maintainable class
2347 -
2348 -[[~[10~]>>path:#_ftnref10]] Since these references to SDMX objects include non-permitted characters as per the VTL ID notation, they need to be included between single quotes, according to the VTL rules for irregular names.
2349 -
2350 -[[~[11~]>>path:#_ftnref11]] For the syntax of the VTL operators see the VTL Reference Manual
2351 -
2352 -[[~[12~]>>path:#_ftnref12]] In case the invoked artefact is a VTL component, which can be invoked only within the invocation of a
2353 -
2354 -VTL data set (SDMX dataflow), the specific SDMX class-name (e.g. Dimension, MeasureDimension, TimeDimension, PrimaryMeasure or DataAttribute) can be deduced from the data structure of the SDMX Dataflow which the component belongs to. 
2355 -
2356 -[[~[13~]>>path:#_ftnref13]] If the Agency is composite (for example AgencyA.Dept1.Unit2), the agency is considered different even if only part of the composite name is different (for example AgencyA.Dept1.Unit3 is a different Agency than the previous one). Moreover the agency-id cannot be omitted in part (i.e., if a  TransformationScheme owned by AgencyA.Dept1.Unit2 references an artefact coming from AgencyA.Dept1.Unit3, the specification of the agency-id becomes mandatory and must be complete, without omitting the possibly equal parts like AgencyA.Dept1)
2357 -
2358 -[[~[14~]>>path:#_ftnref14]] Single quotes are needed because this reference is not a VTL regular name.
2359 -
2360 -[[~[15~]>>path:#_ftnref15]] Single quotes are not needed in this case because CL_FREQ is a VTL regular name.
2361 -
2362 -[[~[16~]>>path:#_ftnref16]] The result DFR(1.0)  is be equal to DF1(1.0) save that the component SECTOR is called SEC
2363 -
2364 -[[~[17~]>>path:#_ftnref17]] Rulesets of this kind cannot be reused when the referenced Concept has a different representation.
2365 -
2366 -[[~[18~]>>path:#_ftnref18]] See also the section “VTL-DL Rulesets” in the VTL Reference Manual.
2367 -
2368 -[[~[19~]>>path:#_ftnref19]] If a calculated artefact is persistent, it needs a persistent definition, i.e. a SDMX definition in a SDMX environment. Also possible calculated artefact that are not persistent may require a SDMX definition, for example when the result of a non-persistent calculation is disseminated through SDMX tools (like an inquiry tool).
2369 -
2370 -[[~[20~]>>path:#_ftnref20]] See the VTL 2.0 User Manual
2371 -
2372 -[[~[21~]>>path:#_ftnref21]] See the SDMX 2.1 Section 2 – Information Model
2373 -
2374 -[[~[22~]>>path:#_ftnref22]] Besides the mapping between one SDMX Dataflow and one VTL Data Set, it is also possible to map distinct parts of a SDMX Dataflow to different VTL Data Set, as explained in a following paragraph.
2375 -
2376 -[[~[23~]>>path:#_ftnref23]] The SDMX community is evaluating the opportunity of allowing more than one measure component in a DataStructureDefinition in the next SDMX major version.
2377 -
2378 -[[~[24~]>>path:#_ftnref24]] If future SDMX major versions will allow multi-measures data structures, this method is expected to  become applicable even if the VTL data structure has more than one measure
2379 -
2380 -[[~[25~]>>path:#_ftnref25]] The kind of mapping explained here works in combination with a SDMX specific naming convention that requires pre-processing before parsing the VTL expressions. As highlighted below, the identifiers of the VTL datasets are a shortcut of some specific VTL operators applied to the SDMX Dataflows. This is not safe to use outside an SDMX context, as the naming convention may have no meaning there.
2381 -
2382 -[[~[26~]>>path:#_ftnref26]] A typical example of this kind is the validation, and more in general the manipulation, of individual time series belonging to the same Dataflow, identifiable through the dimension components of the Dataflow except the time Dimension. The coding of these kind of operations might be simplified by mapping distinct time series (i.e. different parts of a SDMX Dataflow) to distinct VTL data sets.
2383 -
2384 -[[~[27~]>>path:#_ftnref27]] Please note that this kind of mapping is only an option at disposal of the definer of VTL Transformations; in fact it remains always possible to manipulate the needed parts of SDMX Dataflows by means of VTL operators (e.g. “sub”, “filter”, “calc”, “union” …), maintaining a mapping one-to-one between SDMX Dataflows and VTL datasets.
2385 -
2386 -[[~[28~]>>path:#_ftnref28]] This definition is made through the ToVtlSubspace and ToVtlSpaceKey classes and/or the FromVtlSuperspace  and FromVtlSpaceKey classes, depending on the direction of the mapping (“key” means “dimension”). The mapping of Dataflow subsets can be applied independently in the two directions, also according to different Dimensions.  When no Dimension is declared for a given direction, it is assumed that the option of mapping different parts of a SDMX Dataflow to different VTL datasets is not used.
2387 -
2388 -[[~[29~]>>path:#_ftnref29]] As a consequence of this formalism, a slash in the name of the VTL dataset assumes the specific meaning of separator between the name of the Dataflow and the values of some of its Dimensions.
2389 -
2390 -[[~[30~]>>path:#_ftnref30]] This is the order in which the dimensions are defined in the ToVtlSpaceKey class or in the FromVtlSpaceKey class, depending on the direction of the mapping.
2391 -
2392 -[[~[31~]>>path:#_ftnref31]] It should be remembered that, according to the VTL consistency rules, a given VTL dataset cannot be the result of more than one VTL transformation.
2393 -
2394 -[[~[32~]>>path:#_ftnref32]] If these dimensions would not be dropped, taking into account that the typical binary VTL operations at dataset level (+, -, *, / and so on) are executed on the observations having matching identifiers, the VTL datasets resulting from this kind of mapping would have non-matching values for the mapping dimensions (e.g. POPULATION and COUNTRY), therefore it would not be possible to compose the resulting VTL datasets one another  (e.g. it would not be possible to calculate the population ratio between USA and CANADA). ^^ ^^
2395 -
2396 -[[~[33~]>>path:#_ftnref33]] In case  the ordered concatenation notation is used, the VTL Transformation described above, e.g.
2397 -
2398 -‘DF1(1.0)/POPULATION.USA’ :=  DF1(1.0) [ sub  INDICATOR=“POPULATION”, COUNTRY=“USA”], is implicitly executed and, in order to test the overall compliance of the VTL program to the VTL consistency rules, it has to be considered as part of the VTL program even if it is not explicitly coded.
2399 -
2400 -[[~[34~]>>path:#_ftnref34]] If the whole DF2(1.0) is calculated by means of just one VTL transformation,  then the mapping between the SDMX dataflow and the corresponding VTL dataset is one-to-one and this kind of mapping (one SDMX Dataflow to many VTL datasets) does not apply..
2401 -
2402 -[[~[35~]>>path:#_ftnref35]] This is possible as each VTL dataset corresponds to one particular combination of values of INDICATOR and COUNTRY
2403 -
2404 -[[~[36~]>>path:#_ftnref36]] The mapping dimensions are defined as FromVtlSpaceKeys of the FromVtlSuperSpace of the ,,VtlDataflowMapping,, relevant to DF2(1.0)
2405 -
2406 -[[~[37~]>>path:#_ftnref37]] the symbol of the VTL persistent assignment is used (<-)
2407 -
2408 -[[~[38~]>>path:#_ftnref38]] The result is persistent in this example but it can be also non persistent if needed.
2409 -
2410 -[[~[39~]>>path:#_ftnref39]] In case the ordered concatenation notation from VTL to SDMX is used, the set of transformations described above is implicitly performed; therefore, in order to test the overall compliance of the VTL program to the VTL consistency rules, these implicit transformations have to be considered as part of the VTL program even if they are not explicitly coded.
2411 -
2412 -[[~[40~]>>path:#_ftnref40]] Through SDMX Constraints, it is possible to specify the values that a Component of a Dataflow can assume.
2413 -
2414 -[[~[41~]>>path:#_ftnref41]] By using represented variables, VTL can assume that data structures having the same variables as identifiers can be composed one another because the correspondent values can match.
2415 -
2416 -[[~[42~]>>path:#_ftnref42]] A Concept becomes a Component in a DataStructureDefinition, and Components can have different LocalRepresentations in different DataStructureDefinitions, also overriding the (possible) base representation of the Concept.
2417 -
2418 -[[~[43~]>>path:#_ftnref43]] The representation given in the DSD should obviously be compatible with the VTL data type.
2028 +{{putFootnotes/}}
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