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21 21  **Section 2** **SDMX Information Model** - the [[SDMX information model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]] is a standardised object model for modelling [[statistical domains>>doc:sdmx:Glossary 2\.1.Statistical subject-matter domain.WebHome]] centring on the structure of their data and [[metadata sets>>doc:sdmx:Glossary 2\.1.Metadata set.WebHome]], the coding schemes used for [[classification>>doc:sdmx:Glossary 2\.1.Statistical Classification.WebHome]], and the rules for controlling the exchange of data and metadata between organisations. This document provides a UML specification with supporting narrative.
22 22  
23 -**Section 5** **SDMX Registry Specification** – an [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] ‘registry’ acts as a repository for [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] and provisioning information, and a registry of data and metadata sources. This document sets out the specification.
23 +**Section 5** **[[SDMX Registry>>doc:sdmx:Glossary 2\.1.SDMX Registry.WebHome]] Specification** – an [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] ‘registry’ acts as a repository for [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] and provisioning information, and a registry of data and metadata sources. This document sets out the specification.
24 24  
25 -**Section 6** **SDMX Technical Notes** – detailed technical guidance for implementors of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standard.
25 +**Section 6** **[[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Technical Notes** – detailed technical guidance for implementors of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standard.
26 26  
27 -The following are published on the GitHub repository of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Standards Technical Working Group ([[__https:~~/~~/github.com/sdmx-twg__>>https://https:github.comsdmx-twg]]): sdmx-twg/sdmx-rest – REST API
27 +The following are published on the GitHub repository of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Standards Technical Working Group ([[__https:~~/~~/github.com/sdmx-twg__>>https://https:github.comsdmx-twg]]): [[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-twg/[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-rest – REST API
28 28  
29 29  Technical specifications for the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] RESTful web services application programming interfaces (API).
30 30  
31 31  (% class="wikigeneratedid" id="Hsdmx-twg2Fsdmx-ml2013SDMX-ML" %)
32 -**sdmx-twg/sdmx-ml – SDMX-ML**
32 +**[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-twg/[[sdmx-ml>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] – [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]]**
33 33  Technical specifications for the XML transmission format including XSD schemas, documentation and samples for data, structure and [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] messages.
34 34  
35 35  (% class="wikigeneratedid" id="Hsdmx-twg2Fsdmx-json2013SDMX-JSON" %)
36 -**sdmx-twg/sdmx-json – SDMX-JSON**
36 +**[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-twg/[[sdmx-json>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] – [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]]**
37 37  Technical specifications for the JSON transmission format including documentation, schemas and samples for data, structure and [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] messages.
38 38  
39 39  (% class="wikigeneratedid" id="Hsdmx-twg2Fsdmx-csv2013SDMX-CSV" %)
40 -**sdmx-twg/sdmx-csv – SDMX-CSV**
40 +**[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-twg/[[sdmx-csv>>doc:sdmx:Glossary 2\.1.SDMX-CSV.WebHome]] – [[SDMX-CSV>>doc:sdmx:Glossary 2\.1.SDMX-CSV.WebHome]]**
41 41  Technical specifications for the [[SDMX-CSV>>doc:sdmx:Glossary 2\.1.SDMX-CSV.WebHome]] transmission format for ‘comma-separated values’ (CSV) data and [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]].
42 42  
43 43  The following sections are obsolete:
44 44  
45 -Section 3 - SDMX-ML - replaced by the sdmx-twg/sdmx-ml GitHub repository
45 +Section 3 - [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] - replaced by the [[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-twg/[[sdmx-ml>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] GitHub repository
46 46  
47 -Section 4 - SDMX-EDI
47 +Section 4 - [[SDMX-EDI>>doc:sdmx:Glossary 2\.1.SDMX-EDI.WebHome]]
48 48  
49 -Section 7 - API - replaced by the sdmx-twg/sdmx-rest GitHub repository [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]
49 +Section 7 - API - replaced by the [[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-twg/[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-rest GitHub repository [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]
50 50  
51 51  In July 2020 the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 specifications were revised to add support for the [[Validation and Transformation Language>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] ([[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]). For 3.0, the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] specification has been updated to align with changes to the information model and other modifications to the Standard such as the introduction of Semantic Versioning for the versioning of [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]. Section 2 (Information Model) sets out details of the ‘Transformation and Expressions’ package for defining and managing [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 2.0 programs and Section 6 (Technical Notes) provides detailed guidance on implementing and using [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] with [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]].
52 52  
53 53  = 2 Change History =
54 54  
55 -The 2.0 version of this standard represented a significant increase in scope, and also provided more complete support in those areas covered in the version 1.0 specification. Version 2.0 of this standard is backward-compatible with version 1.0, so that existing implementations can be easily migrated to conformance with version 2.0.
55 +The 2.0 (% style="color:#e74c3c" %)version(%%) of this standard represented a significant increase in scope, and also provided more complete support in those areas covered in the (% style="color:#e74c3c" %)version(%%) 1.0 specification. (% style="color:#e74c3c" %)Version(%%) 2.0 of this standard is backward-compatible with (% style="color:#e74c3c" %)version(%%) 1.0, so that existing implementations can be easily migrated to conformance with (% style="color:#e74c3c" %)version(%%) 2.0.
56 56  
57 -The 2.1 version of this standard represents a set of changes resulting from several years of implementation experience with the 2.0 standard. The changes do not represent a major increase in scope or functionality, but do correct some bugs, and add functionalities in some cases. Major changes in [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] include a much stronger alignment of the XML Schemas with the Information Model, to emphasize inheritance and object-oriented features, and increased precision and flexibility in the attachment of metadata reports to specific objects in the [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]].
57 +The 2.1 (% style="color:#e74c3c" %)version(%%) of this standard represents a set of changes resulting from several years of implementation experience with the 2.0 standard. The changes do not represent a major increase in scope or functionality, but do correct some bugs, and add functionalities in some cases. Major changes in [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] include a much stronger alignment of the XML Schemas with the Information Model, to emphasize inheritance and object-oriented features, and increased precision and flexibility in the attachment of metadata reports to specific objects in the [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]].
58 58  
59 -The 3.0 version incorporates new features, improvements and changes arising from the collective knowledge gained from a decade of operating experience with the 2.1 standard. In pursuit of modernisation and simplification, features considered obsolete have been deprecated – in particular the EDI transmission format, the lesser-used XML data messages and the SOAP web services API. Many areas remain backwardly compatible with 2.1, but there are some breaking changes where the information model has been redesigned to better support practical use case. Structure mapping and [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] are examples. The opportunity has been taken to revise the RESTful web services API which is also not backwardly compatible, but benefits from a rationalisation and better organisations of resources, and a much richer data query URL syntax.
59 +The 3.0 (% style="color:#e74c3c" %)version(%%) incorporates new features, improvements and changes arising from the collective knowledge gained from a decade of operating experience with the 2.1 standard. In pursuit of modernisation and simplification, features considered obsolete have been deprecated – in particular the EDI transmission format, the lesser-used XML data messages and the SOAP web services API. Many areas remain backwardly compatible with 2.1, but there are some breaking changes where the information model has been redesigned to better support practical use case. Structure mapping and [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] are examples. The opportunity has been taken to revise the RESTful web services API which is also not backwardly compatible, but benefits from a rationalisation and better organisations of resources, and a much richer data query URL syntax.
60 60  
61 -The 3.1 version provides supports for data models to increase dimensionality over time without impacting existing data collections. The Data Constraint model was adjusted to separate concerns of data reporting and data dissemination.
61 +The 3.1 (% style="color:#e74c3c" %)version(%%) provides supports for data models to increase dimensionality over time without impacting existing data collections. The Data (% style="color:#e74c3c" %)Constraint(%%) model was adjusted to separate concerns of data reporting and data dissemination.
62 62  
63 63  == 2.1 Major Changes from 1.0 to 2.0 ==
64 64  
65 65  *
66 -* **[[Reference Metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]]**: In addition to describing and specifying data structures and formats (along with related [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]]), the version 2.0 specification also provides for the exchange of metadata which is distinct from the [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] in the 1.0 version. This [[category>>doc:sdmx:Glossary 2\.1.Category.WebHome]] includes “reference” metadata (regarding data quality, methodology, and similar types – it can be configured by the user to include whatever concepts require reporting); metadata related to data provisioning ([[release calendar>>doc:sdmx:Glossary 2\.1.Release policy - release calendar.WebHome]] information, description of the data and metadata provided, etc.); and metadata relevant to the exchange of categorization schemes.
66 +* **[[Reference Metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]]**: In addition to describing and specifying data structures and formats (along with related [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]]), the (% style="color:#e74c3c" %)version(%%) 2.0 specification also provides for the exchange of metadata which is distinct from the [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] in the 1.0 (% style="color:#e74c3c" %)version(%%). This [[category>>doc:sdmx:Glossary 2\.1.Category.WebHome]] includes “reference” metadata (regarding data quality, methodology, and similar types – it can be configured by the user to include whatever (% style="color:#e74c3c" %)concepts(%%) require reporting); metadata related to data provisioning ([[release calendar>>doc:sdmx:Glossary 2\.1.Release policy - release calendar.WebHome]] information, description of the data and metadata provided, etc.); and metadata relevant to the exchange of categorization schemes.
67 67  * **[[SDMX Registry>>doc:sdmx:Glossary 2\.1.SDMX Registry.WebHome]]**: Provision is made in the 2.0 standard for standard communication with registry services, to support a data-sharing model of statistical exchange. These services include registration of data and metadata, querying of registered data and metadata, and [[subscription>>doc:sdmx:Glossary 2\.1.Subscription.WebHome]]/[[notification>>doc:sdmx:Glossary 2\.1.Notification.WebHome]].
68 68  * **[[Structural Metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]]**: The support for exchange of statistical data and related [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] has been expanded. Some support is provided for qualitative data; data cube structures are described; [[hierarchical code>>doc:sdmx:Glossary 2\.1.Hierarchical code.WebHome]] lists are supported; relationships between data structures can be expressed, providing support for extensibility of data structures; and the description of functional dependencies within cubes are supported.
69 69  
... ... @@ -77,14 +77,14 @@
77 77  * **Consistency between the [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] and the [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]: **Certain aspects of the XML schemas and UML model have been more closely aligned, to allow for easier comprehension of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] model.
78 78  * **Technical Bugs:** Some minor technical bugs have been identified in the registry interfaces and elsewhere. These bugs have been addressed.
79 79  * **Support for Non-Time-[[Series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] Data in the Generic Format: **One area which has been extended is the ability to express non-time-[[series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] data as part of the generic data message.
80 -* **Simplification of the [[data structure definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] - specific message types: **Both [[time series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] (version 2.0 Compact) and non-[[time series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] [[data sets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] (version 2.0 Cross Sectional) use the same underlying structure for a structure-specific formatted message, which is specific to the [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] of the [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]].
80 +* **Simplification of the [[data structure definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] - specific message types: **Both [[time series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] ((% style="color:#e74c3c" %)version(%%) 2.0 Compact) and non-[[time series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] [[data sets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] ((% style="color:#e74c3c" %)version(%%) 2.0 Cross Sectional) use the same underlying structure for a structure-specific formatted message, which is specific to the [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] of the [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]].
81 81  * **Simplification and better support for the metadata structure: **New use cases have been reported and these are now supported by a re-modelled [[metadata structure definition>>doc:sdmx:Glossary 2\.1.Metadata structure definition.WebHome]].
82 -* **Support for partial [[item schemes>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] list: **The concept of a partial (subset) [[item scheme>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a partial [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] list for use in exchange scenarios has been introduced**.**
82 +* **Support for partial [[item schemes>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] list: **The (% style="color:#e74c3c" %)concept(%%) of a partial (subset) [[item scheme>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a partial [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] list for use in exchange scenarios has been introduced**.**
83 83  
84 84  == 2.3 Major Changes from 2.1 to 3.0 ==
85 85  
86 86  
87 -[[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] version 3.0 introduces new features, improvements and changes to the Standard in the following key areas:
87 +[[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)version(%%) 3.0 introduces new features, improvements and changes to the Standard in the following key areas:
88 88  
89 89  (% class="wikigeneratedid" id="HInformationModel" %)
90 90  **Information Model**
... ... @@ -95,10 +95,10 @@
95 95  * Support for [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] list extension and discriminated union of [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] lists
96 96  * Improvements to structure mapping
97 97  * Improvements to [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] [[hierarchies>>doc:sdmx:Glossary 2\.1.Hierarchy.WebHome]] for data discovery
98 -* Improvements to constraints
98 +* Improvements to (% style="color:#e74c3c" %)constraints
99 99  
100 100  (% class="wikigeneratedid" id="HVersioningofStructuralMetadataArtefacts" %)
101 -**Versioning of Structural Metadata Artefacts**
101 +**Versioning of [[Structural Metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] [[Artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]**
102 102  
103 103  Adoption of the three-number semantic versioning standard for [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] ([[__https:~~/~~/semver.org__>>https://https:semver.org]])
104 104  
... ... @@ -113,14 +113,14 @@
113 113  (% class="wikigeneratedid" id="HSOAPWebServicesAPI" %)
114 114  **SOAP Web Services API**
115 115  
116 -* The SOAP web services API has been deprecated with version 3.0 standardising on REST
116 +* The SOAP web services API has been deprecated with (% style="color:#e74c3c" %)version(%%) 3.0 standardising on REST
117 117  
118 118  (% class="wikigeneratedid" id="HXML2CJSON2CCSVandEDITransmissionformats" %)
119 119  **XML, JSON, CSV and EDI Transmission formats**
120 120  
121 -The [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]], [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] and [[SDMX-CSV>>doc:sdmx:Glossary 2\.1.SDMX-CSV.WebHome]] specifications have been extended and modified where needed to support the new features and changes such as [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] and microdata Obsolete [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] data message variants including Generic, Compact, Utility and Cross-sectional have been deprecated standardising on Structure Specific Data as the sole XML format for [[data exchange>>doc:sdmx:Glossary 2\.1.Data exchange.WebHome]] The [[SDMX-EDI>>doc:sdmx:Glossary 2\.1.SDMX-EDI.WebHome]] transmission format for structures and data has been deprecated The organisation of structures into ‘collections’ in [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] and [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] structure messages has been flattened and simplified The option to reference structures in [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] and [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] messages using Agency, ID and Version has been deprecated with URN now exclusively used for all non-local referencing purpose
121 +The [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]], [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] and [[SDMX-CSV>>doc:sdmx:Glossary 2\.1.SDMX-CSV.WebHome]] specifications have been extended and modified where needed to support the new features and changes such as [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] and microdata Obsolete [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] data message variants including Generic, Compact, Utility and Cross-sectional have been deprecated standardising on Structure Specific Data as the sole XML format for [[data exchange>>doc:sdmx:Glossary 2\.1.Data exchange.WebHome]] The [[SDMX-EDI>>doc:sdmx:Glossary 2\.1.SDMX-EDI.WebHome]] transmission format for structures and data has been deprecated The organisation of structures into ‘collections’ in [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] and [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] structure messages has been flattened and simplified The option to reference structures in [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] and [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] messages using Agency, ID and (% style="color:#e74c3c" %)Version(%%) has been deprecated with URN now exclusively used for all non-local referencing purpose
122 122  
123 -Several of the changes are ‘breaking’ meaning that, in specific cases, the version 3.0 specification is not backwardly compatible with earlier versions of the Standard.
123 +Several of the changes are ‘breaking’ meaning that, in specific cases, the (% style="color:#e74c3c" %)version(%%) 3.0 specification is not backwardly compatible with earlier (% style="color:#e74c3c" %)versions(%%) of the Standard.
124 124  
125 125  The principle breaking changes are:
126 126  
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