Changes for page SDMX 3.0 Standards. Summary of Major Changes and New Functionality

Last modified by Helena on 2025/09/10 11:19

From 7.1 to 6.1 From 15.7 to 15.6

From version 15.6

edited by Helena
on 2025/05/16 13:16

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To version 7.1

edited by Helena
on 2025/05/14 13:27

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- SUZ.Methodology.Code.MethodologyClass[0]

Details

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Title

@@ -1,1 +1,1 @@
--SDMX STANDARDS
++1 Overview

Parent

...	...	@@ -1,1 +1,0 @@
1		-Methodology.WebHome

Content

@@ -1,13 +1,9 @@
--{{box title="**Contents**"}}
--{{toc/}}
--{{/box}}
--
++{{box title="**Contents**"}}{{toc/}}{{/box}}
  **Revision History**
--(% style="width:738.039px" %)
--|(% style="width:187px" %)Revision|(% style="width:157px" %)Date|(% style="width:390px" %)Contents
--|(% style="width:187px" %)DRAFT 1.0|(% style="width:157px" %)May 2021|(% style="width:390px" %)Draft release updated for SDMX 3.0 for public consultation
--|(% style="width:187px" %)1.0|(% style="width:157px" %)October 2021|(% style="width:390px" %)Public Release for SDMX 3.0
++|Revision|Date|Contents
++|DRAFT 1.0|May 2021|Draft release updated for SDMX 3.0 for public consultation
++|1.0|October 2021|Public Release for SDMX 3.0
  = 1 Overview =
@@ -25,7 +25,7 @@
  **Versioning of Structural Metadata Artefacts**
--* Adoption of the three-number semantic versioning standard for structural metadata artefacts ([[https:~~/~~/semver.org/>>https://semver.org/||rel="noopener noreferrer" target="_blank"]])
++• Adoption of the three-number semantic versioning standard for structural metadata artefacts [[(>>url:https://semver.org/]][[__https:~~/~~/semver.org__>>url:https://semver.org/]][[)>>url:https://semver.org/]]
  **REST Web Services Application Programming Interface (API)**
@@ -36,7 +36,7 @@
  **SOAP Web Services API**
--* The SOAP web services API has been deprecated with version 3.0 standardising on REST**;**
++• The SOAP web services API has been deprecated with version 3.0 standardising on REST**&nbsp;**
  **XML, JSON, CSV and EDI Transmission formats**
@@ -65,10 +65,9 @@
  Version 3.0 introduces breaking changes into the web services API, transmission formats and information model. A summary is given in the table below.
--== 2.1 Web Services API ==
++== //2.1 Web Services API// ==
--(% style="width:948.039px" %)
--|**REST API**|(% style="width:818px" %)(((
++|**REST API**|(((
  The REST API is not backwardly compatible due to modifications to the URLs and query parameters resulting in breaking changes in four of the five main resources:
  * Structure queries
@@ -84,13 +84,14 @@
  Implementors are also recommended to version their API services providing users with an explicit choice of which version to use.
  )))
--|**SOAP API**|(% style="width:818px" %)The SOAP API has been deprecated.
++|**SOAP API**|The SOAP API has been deprecated.
--== 2.2 Transmission Formats ==
++== //2.2 Transmission Formats// ==
++:
++
  (((
--(% style="width:952.039px" %)
--|(% style="width:130px" %)**SDMX-ML**|(% style="width:820px" %)(((
++|**SDMX-ML**|(((
  The following legacy XML data messages have been deprecated:
  SDMX-ML 1.0/2.0 Generic (time-series) data message
@@ -106,27 +106,34 @@
  The SDMX-ML structure message is not backwardly compatible primarily due to:
  * Changes to the information model
--* Changes to the way the structures are organised into ‘collections’ within the message
++* Changes to the way the structures are organised into
++
++‘collections’ within the message
++
  * Deprecation of the Agency, ID, Version option for referencing of structures in messages
  )))
--|(% style="width:130px" %)**SDMX-JSON**|(% style="width:820px" %)(((
++|**SDMX-JSON**|(((
  The JSON data message is not backwardly compatible with version 2.1 primarily due to changes needed to support the improved REST API data queries, in particular the ability to retrieve in one operation data from multiple datasets with potentially different Data Structure Definitions.
  The JSON structure message is not backwardly compatible primarily due to:
  * Changes to the information model
--* Changes to the way the structures are organised into ‘collections’ within the message
++* Changes to the way the structures are organised into
++
++‘collections’ within the message
++
  * Deprecation of the Agency, ID, Version option for referencing of structures in messages
  )))
--|(% style="width:130px" %)**SDMX-EDI**|(% style="width:820px" %)The EDI format for both structures and data has been deprecated.
--|(% style="width:130px" %)**SDMX-CSV**|(% style="width:820px" %)The CSV data and reference metadata messages are not backwardly compatible with those under version 2.1 due to changes to the structure of the messages needed to support new features such as the improved REST API data queries.
++|**SDMX-EDI**|The EDI format for both structures and data has been deprecated.
++|**SDMX-CSV**|The CSV data and reference metadata messages are not backwardly compatible with those under version 2.1 due to changes to the structure of the messages needed to support new features such as the improved REST API data queries.** &nbsp;&nbsp;&nbsp;&nbsp;**
  )))
--== 2.3 Information Model ==
++== //2.3 Information Model// ==
++:
++
  (((
--(% style="width:955.039px" %)
--|(% style="width:132px" %)**Data Structure Definition**|(% style="width:819px" %)(((
++|**Data Structure Definition**|(((
  The version 3.0 Data Structure Definition (DSD) model is not directly backwardly compatible with 2.1 primarily due to the deprecation of the special MeasureDimension.
  //Conversion guidance for implementors//
@@ -135,7 +135,7 @@
  Version 3.0 DSDs cannot be reliably converted to the 2.1 model due to the introduction of new features such as multiple measures and value arrays for measures and attributes.
  )))
--|(% style="width:132px" %)**Structure mapping model**|(% style="width:819px" %)(((
++|**Structure mapping model**|(((
  The structure mapping model has changed significantly in version 3.0 with deprecation of the Structure Set maintainable artefact and introduction of five new ones: Representation Map and four variants of item scheme map.
  //Conversion guidance for implementors//
@@ -144,7 +144,7 @@
  Conversion from the version 3.0 structure mapping model to 2.1 is generally possible. However, when attempting to convert mapping rules from 2.1 to 3.0 and back to 2.1, the resulting Structure Set will not be precisely the same as the original. In converting to version 3.0, the system must generate IDs for each of the new maintainable artefacts, but details of the original Structure Set artefacts are lost.
  )))
--|(% style="width:132px" %)**Reference metadata model**|(% style="width:819px" %)(((
++|**Reference metadata model**|(((
  The reference metadata model has changed in version 3.0 with modifications to the role of the Data Structure Definition, Metadata Structure Definition and Metadataflow artefacts. Metadata Provision Agreement and Metadata Provider Scheme have been added. Metadatasets are now identifiable.
  Version 2.1 reference metadata models are not valid in version 3.0.
@@ -151,11 +151,14 @@
  //Conversion guidance for implementors//
--A version 2.1 Metadata Structure Definition can be converted to the version 3.0 model under some circumstances, but target information is either lost or has to be translated into a metadataflow. Further, conversion of a Data Structure Definition for collecting reference metadata against a dataset would need to make changes to the dataset’s Data Structure Definition. As the Data Structure Definition may not actually be specified, judgement would need to be taken, perhaps determining the most likely candidate by examining which already have metadata reported against their datasets. A 2.1 metadata report could be converted to a version 3.0 Metadataset if it is attached to a structure, but requires a Metadata Provision Agreement which would need to be created if not already in existence.
++A version 2.1 Metadata Structure Definition can be converted to the version 3.0 model under some circumstances, but target information is either lost or has to be translated into a metadataflow. Further, conversion of a Data Structure Definition for collecting reference metadata against a dataset would need to make changes to the dataset’s Data Structure Definition. As the Data Structure Definition may not actually be specified, judgement would need to be taken, perhaps determining the most likely candidate by examining which
++)))
++| |(((
++already have metadata reported against their datasets. A 2.1 metadata report could be converted to a version 3.0 Metadataset if it is attached to a structure, but requires a Metadata Provision Agreement which would need to be created if not already in existence.
  Conversion from the version 3.0 model to version 2.1 cannot be performed reliably. The process would need target information to be derived from analysis of the Metadataflows and Metadata Provision Agreements. Depending on the complexity it may not be possible to express that information in a version 2.1 Data Structure Definition.
  )))
--|(% style="width:132px" %)**Constraint model**|(% style="width:819px" %)(((
++|**Constraint model**|(((
  The version 2.1 Content Constraint artefact has been deprecated in version 3.0 and replaced by the Data Constraint for data, and the Metadata Constraint for reference metadata.
  //Conversion guidance for implementors//
@@ -164,7 +164,7 @@
  Conversion from 3.0 to 2.1 presents challenges where wildcards have been used, in those cases requiring expansion of the wildcard into explicit values.
  )))
--|(% style="width:132px" %)**Hierarchical codelist structures**|(% style="width:819px" %)(((
++|**Hierarchical codelist structures**|(((
  The version 2.1 Hierarchical Codelist artefact has been deprecated in version 3.0 and replaced by two new artefacts, Hierarchy and Hierarchy Association.
  //Conversion guidance for implementors//
@@ -177,7 +177,7 @@
  = 3 Information Model =
--== 3.1 Version 3.0 Information Model ==
++== //3.1 Version 3.0 Information Model// ==
  [[image:SDMX 3-0-0 Major Changes FINAL-1.0_en_6fc573fe.png||height="404" width="718"]]
@@ -187,7 +187,7 @@
  A number of ancillary structures including organisation schemes, process and reporting taxonomy are unchanged and have not been shown. Similarly, Organisation Scheme Map and Reporting Taxonomy Map have been omitted for simplicity. A schematic of the 2.1 model is given in Appendix A for comparison purposes.
--== 3.2 Key Changes from Version 2.1 ==
++== //3.2 Key Changes from Version 2.1// ==
  New Maintainable Artefacts
@@ -215,8 +215,7 @@
  Removed Maintainable Artefacts
  * Structure Set – replaced by Structure Map and the four item scheme maps
--* Hierarchical Codelist – replaced by Hierarchy and Hierarchy Association
--* Constraint – replaced by Data Constraint and Metadata Constraint
++* Hierarchical Codelist – replaced by Hierarchy and Hierarchy Association • Constraint – replaced by Data Constraint and Metadata Constraint
  Changed Maintainable Artefacts
@@ -230,7 +230,7 @@
  * GeospatialInformation – a string type where the value is an expression defining a set of geographical features using a purpose-designed syntax
--== 3.3 Areas Unchanged from Version 2.1 ==
++== //3.3 Areas Unchanged from Version 2.1// ==
  The following areas of the information model are unchanged from version 2.1:
@@ -243,7 +243,7 @@
  * Reporting taxonomy
  * Process
--== 3.4 Reference Metadata ==
++== //3.4 Reference Metadata// ==
  Reference metadata has been substantially re-designed for version 3.0 to simplify the model and better support practical use cases.
@@ -271,96 +271,158 @@
  * TITLE – a multi-lingual data attribute
  * SOURCE_AGENCY – a multi-value data attribute
--> <Obs xsi:type="dsd:ObsType" OBS_VALUE="112" OBS_STAUS=”A” TIME_PERIOD="2010-09">
-->     <!—- complex multi-value and multi-lingual data attributes ~-~->
-->     <Comp id="TITLE" xsi:type="ns1:TITLE_ATTRIBUTE">
-->         <Value>
-->         <common:Text xml:lang="en">Some English Text</common:Text>
-->         <common:Text xml:lang="fr">Quelques textes en anglais</common:Text>
-->         </Value>
-->     </Comp>
-->     <Comp id="SOURCE_AGENCY" xsi:type="ns1:SOURCE_AGENCY_ATTRIBUTE">
-->         <Value>4F0</Value>
-->         <Value>4D0</Value>
-->         <Value>CZ2</Value>
-->     </Comp>
--> <!—- metadata attributes are reported like in metadata messages ~-~->
--> <Metadata>
-->     <Attribute id="COLLECTION">
-->         <Attribute id="METHOD">
-->             <Text lang="en">AAA</Text>
-->         </Attribute>
-->     </Attribute>
-->     <Attribute id="CONTACT">
-->          <Value>CONTACT 1</Value>
-->          <Attribute id="NAME">
-->             <Value>Contact 1 Name 1</Value>
-->      </Attribute>
-->      <Attribute id="NAME">
-->             <Value>Contact 1 Name 2</Value>
-->         </Attribute>
-->     </Attribute>
-->     <Attribute id="CONTACT">
-->           <Value>CONTACT 2</Value>
-->         <Attribute id="NAME">
-->             <Value>Contact 2 Name 1</Value>
-->       </Attribute>
-->       <Attribute id="NAME">
-->                 <Value>Contact 2 Name 2</Value>
-->                </Attribute>
-->           </Attribute>
-->       </Metadata>
--> </Obs>
++<Obs xsi:type="dsd:ObsType" OBS_VALUE="112" OBS_STAUS=”A” TIME_PERIOD="2010-09">
--(% class="wikigeneratedid" id="HNew-MetadataProvisionAgreement" %)
--**New - Metadata Provision Agreement**
++<!—- complex multi-value and multi-lingual data attributes ~-~->
++
++<Comp id="TITLE" xsi:type="ns1:TITLE_ATTRIBUTE">
++
++<Value>
++
++<common:Text xml:lang="en">Some English Text</common:Text>
++
++<common:Text xml:lang="fr">Quelques textes en anglais</common:Text>
++
++</Value>
++
++</Comp>
++
++<Comp id="SOURCE_AGENCY" xsi:type="ns1:SOURCE_AGENCY_ATTRIBUTE">
++
++<Value>4F0</Value>
++
++<Value>4D0</Value>
++
++<Value>CZ2</Value>
++
++</Comp>
++
++<!—- metadata attributes are reported like in metadata messages ~-~->
++
++<Metadata>
++
++<Attribute id="COLLECTION">
++
++<Attribute id="METHOD">
++
++<Text lang="en">AAA</Text>
++
++</Attribute>
++
++</Attribute>
++
++<Attribute id="CONTACT">
++
++<Value>CONTACT 1</Value>
++
++<Attribute id="NAME">
++
++<Value>Contact 1 Name 1</Value>
++
++</Attribute>
++
++<Attribute id="NAME">
++
++<Value>Contact 1 Name 2</Value>
++
++</Attribute>
++
++</Attribute>
++
++<Attribute id="CONTACT">
++
++<Value>CONTACT 2</Value>
++
++<Attribute id="NAME">
++
++<Value>Contact 2 Name 1</Value>
++
++</Attribute>
++
++<Attribute id="NAME">
++
++<Value>Contact 2 Name 2</Value>
++
++</Attribute>
++
++</Attribute>
++
++</Metadata>
++
++</Obs>
++
++=== New - Metadata Provision Agreement ===
++
  In version 2.1 a Provision Agreement could be used to report information against a Dataflow or Metadataflow. From version 3.0 this is managed by two separate structures, the Data Provision Agreement and the Metadata Provision Agreement.
--(% class="wikigeneratedid" id="HMovetargettoMetadataflowandMetadataProvisionAgreement" %)
--**Move target to Metadataflow and Metadata Provision Agreement**
++=== Move target to Metadataflow and Metadata Provision Agreement ===
++
  For reference metadata that is reported against structures, the allowable targets information which is used to specify what structures the reference metadata can be reported against, has moved to the Metadataflow and can be further refined in the Metadata Provision Agreement.
--(% class="wikigeneratedid" id="HAddmaintainablepropertiestoreferencemetadata" %)
--**Add maintainable properties to reference metadata**
++=== Add maintainable properties to reference metadata ===
++
  A Metadataset now has mandatory identification information, (owner id, id, version) enabling metadata providers to uniquely identify their reports for create, update or delete maintenance operations.
--== 3.5 Microdata Exchange ==
++== //3.5 Microdata Exchange// ==
  Several changes have been made the Data Structure Definition to support microdata use cases in addition to aggregated time series.
--(% class="wikigeneratedid" id="HMultiplemeasures" %)
--**Multiple measures**
--Multiple measures are a common characteristic of microdatasets. To support this use case, the MeasureDimension has been deprecated and replaced with the option to define zero or more measures. Measures now act like any other component in that they use concepts, can have their own local coded or uncoded representation defined within the Data Structure Definition, and can be either mandatory or conditional. Creating a measure with the “MEASURE” concept role applied emulates the version 2.1 MeasureDimension behaviour as illustrated in the SDMX-ML example below:
++=== Multiple measures ===
--> <str:MeasureList id=”MeasureDescriptor”>
-->     <str:Measure id=”OBS_VALUE” minOccurs=”1” maxOccurs=”1” usage=”mandatory” > <str:ConceptIdentity>
-->         <Ref id=”OBS_VALUE” maintainableParentID=”CONCEPTS” agencyID=”SDMX” maintainableParentVersion=”1.0.0” />
-->     </str:ConceptIdentity>
-->     <str:LocalRepresentation>
-->         <str:TextFormat textType=”String” isMultiLingual=”true” />
-->     </str:LocalRepresentation>
-->     <str:ConceptRole>
-->         <Ref id=”MEASURE” maintainableParentID=”SDMX_CONCEPT_ROLES” agencyID=”SDMX” maintainableParentVersion=”1.0.0” />
-->     </str:ConceptRole>
-->  </str:Measure>
-->         ...
-->     <str:Measure>
--> </str:MeasureList>
++Multiple measures are a common characteristic of microdatasets. To support this use case, the MeasureDimension has been deprecated and replaced with the option to define zero or more measures. Measures now act like any other component in that they use concepts, can have their own local coded or uncoded representation defined within the
--(% class="wikigeneratedid" id="HMulti-valuemeasuresandattributes" %)
--**Multi-value measures and attributes**
--Both measures and attributes have been extended with the option to take ‘arrays’ of 193 multiple coded or uncoded values. This supports use cases like multiple observation 194 status flags. New //minOccurs// and //maxOccurs// properties define the valid number of 195 values. The //usage// property separately defines whether the measure or attribute is //mandatory// or optional. In the SDMX-ML measure example above, the properties //minOccurs=”1” maxOccurs=”1” usage=”mandatory”// specify that OBS_VALUE must be 198 reported, and can only consist of a single value.
++Data Structure Definition, and can be either mandatory or conditional. Creating a measure with the “MEASURE” concept role applied emulates the version 2.1
--(% class="wikigeneratedid" id="HAttributesrelationshiptomeasures" %)
--**Attributes relationship to measures**
++MeasureDimension behaviour as illustrated in the SDMX-ML example below:
++
++<str:MeasureList id=”MeasureDescriptor”>
++
++<str:Measure id=”OBS_VALUE” minOccurs=”1” maxOccurs=”1” usage=”mandatory” > <str:ConceptIdentity>
++
++<Ref id=”OBS_VALUE” maintainableParentID=”CONCEPTS” agencyID=”SDMX” maintainableParentVersion=”1.0.0” />
++
++</str:ConceptIdentity>
++
++<str:LocalRepresentation>
++
++<str:TextFormat textType=”String” isMultiLingual=”true” />
++
++</str:LocalRepresentation>
++
++<str:ConceptRole>
++
++<Ref id=”MEASURE” maintainableParentID=”SDMX_CONCEPT_ROLES” agencyID=”SDMX” maintainableParentVersion=”1.0.0” />
++
++</str:ConceptRole>
++
++</str:Measure>
++
++...
++
++<str:Measure>
++
++</str:MeasureList>
++
++=== Multi-value measures and attributes ===
++
++Both measures and attributes have been extended with the option to take ‘arrays’ of 193 multiple coded or uncoded values. This supports use cases like multiple observation 194 status flags. New //minOccurs// and //maxOccurs// properties define the valid number of 195 values. The //usage// property separately defines whether the measure or attribute is
++
++//mandatory// or optional. In the SDMX-ML measure example above, the properties
++
++//minOccurs=”1” maxOccurs=”1” usage=”mandatory”// specify that OBS_VALUE must be 198 reported, and can only consist of a single value.
++
++=== Attributes relationship to measures ===
++
  In addition to attaching attributes to a specific level within the dataset, their relationship 202 to measures can also be defined.
--(% class="wikigeneratedid" id="HValuelists" %)
--**Value lists**
--Value lists help in modelling microdata by providing an enumeration similar to code lists 206 but allowing any string values without being restricted to the rules of SDMX identifiers. That allows ValueItems (the equivalent to Code) to contain symbols like ‘¥’ and ‘€’, but also means they are not identifiable.
++=== Value lists ===
--== 3.6 Geospatial Data Exchange ==
++Value lists help in modelling microdata by providing an enumeration similar to code lists 206 but allowing any string values without being restricted to the rules of SDMX identifiers.
++That allows ValueItems (the equivalent to Code) to contain symbols like ‘¥’ and ‘€’, but 208 also means they are not identifiable.
++
++== //3.6 Geospatial Data Exchange// ==
++
  The version 3.0 model has been extended to provide explicit support for geospatial data.
  === GeospatialInformation type ===
@@ -374,14 +374,14 @@
  * GeographicCodelist – each item includes an element to represent a specific Geo Feature Set which is described using the same expression syntax as for GeospatialInformation type.
  * GeoGridCodelist – A code list defining a geographical grid composed of cells representing regular squared portions of the Earth. Each item references a cell within the grid.
--== 3.7 Structure Mapping ==
++=== //3.7 Structure Mapping// ===
  The Structure Set in version 2.1 is a container for many mapping structures including Data Structure Map, Codelist Map and Concept Map. For version 3.0 the Structure Set artefact has been deprecated and replaced with a number of new maintainables giving better flexibility and reusability, specifically: Structure Map, Concept Scheme Map, Representation Map, Reporting Taxonomy Map, Category Scheme Map and Organisation Scheme Map.
  The version 2.1 Codelist Map been replaced with Representation Map which allows mappings to be defined between any combination of Code Lists, Value Lists and noncoded representations such as text strings and numbers.
--(% class="wikigeneratedid" id="HMany-to-manysourceandtargetcomponents" %)
--**Many-to-many source and target components**
++==== Many-to-many source and target components ====
++
  Structure mapping rules may be defined with both multiple source components and multiple target components in contrast to version 2.1 where only one source and target was allowed. That supports many-to-many (n-n) mapping use cases where the output of a mapping rule may be dependent on the combination of a number of input components. For instance:
  Set the output component INDICATOR=”DE_A” if the input components are FREQ=”A” and REF_AREA=”DE”.
@@ -391,21 +391,22 @@
  Set the output components FREQ=”A”, REF_AREA=”DE” if the input component INDICATOR=”DE_A”.
  **Fixed source and target**
++
  The Structure Map may now define input or output components which have a fixed value.
--(% class="wikigeneratedid" id="HTimerepresentationsmapping" %)
--**Time representations mapping**
++==== Time representations mapping ====
++
  Non SDMX time representations may now be described in a Structure Map, allowing them to be mapped into SDMX time formats.
--(% class="wikigeneratedid" id="HRegularexpressionandsubstringmappings" %)
--**Regular expression and substring mappings**
++==== Regular expression and substring mappings ====
++
  All item maps allow the use of regular expressions and substrings to match source values, specifically: Concept Scheme Map, Reporting Taxonomy Map, Category Scheme Map and Organisation Scheme Map.
--(% class="wikigeneratedid" id="HItemmapsvalidityperiod" %)
--**Item maps validity period**
++==== Item maps validity period ====
++
  Item maps may further define the period for which the mapping is valid, meaning the mapping rule will only be applied if the row of information being mapped is within the period.
--== 3.8 Constraints ==
++=== //3.8 Constraints// ===
  Constraints in version 3.0 are modelled using two separate artefacts which replace the version 2.1 content constraint:
@@ -420,23 +420,23 @@
  Attachment constraints have been deprecated due to a lack of use cases.
--== 3.9 Code List Extension ==
++=== //3.9 Code List Extension// ===
  In addition to the two new specialised geospatial forms, the option has been added to define a code list as an extension of, or by inheriting codes from, other lists. An optional prefix can be added to inherited codes to disambiguate duplicates.
  This feature allows new code lists to be easily derived from existing lists without the need to make and manually maintain copies. When querying for extended code list structures using the REST API, the option has been added to retrieve either the definition or the materialised list. Traditional literal lists of codes continue to be supported.
--== 3.10 Discriminated Union of Code Lists ==
++=== //3.10 Discriminated Union of Code Lists// ===
  Combining code list extension with wildcarded constraints solves the discriminated union of code lists problem where a classification or breakdown has multiple “variants” which are all valid but mutually exclusive. A common example is economic activity where several alternative classification schemes are in use including ISIC revisions 1 to 4 and NACE as used in the European Community.
--== 3.11 Code Hierarchies ==
++=== //3.11 Code Hierarchies// ===
  Code hierarchies allow the definition of complex hierarchies of codes from potentially multiple lists for data discovery purposes. Hierarchical Codelist has been deprecated and replaced by two new artefacts: Hierarchy – the actual hierarchy of codes, and Hierarchy Association links hierarchies directly to any other identifiable object, a capability missing 312 from the version 2.1 model. Further, the linkage can be within a particular context, for instance linking a hierarchy to a dimension within the context of a specific Dataflow (dimension REF_AREA in the context of the ECB:EXR Dataflow).
  = 4 Versioning of Structural Metadata Artefacts =
--Version 3.0 adopts semantic versioning principles for versioning of metadata artefacts following the rules set out at __[[https:~~/~~/semver.org>>https://semver.org]] __However, this is not mandatory, and organisations may continue to use the pre-existing two-digit versioning strategy, or not to version artefacts by omitting the //version// property. The version number no longer defaults to 1.0 if not explicitly set.
++Version 3.0 adopts semantic versioning principles for versioning of metadata artefacts following the rules set out at [[__https:~~/~~/semver.org__>>url:https://semver.org/]][[.>>url:https://semver.org/]] However, this is not mandatory, and organisations may continue to use the pre-existing two-digit versioning strategy, or not to version artefacts by omitting the //version// property. The version number no longer defaults to 1.0 if not explicitly set.
  Semantic version numbers are three digits:
@@ -478,7 +478,7 @@
  = 5 REST Web Services API =
--== 5.1 Simplified list of resources ==
++== //5.1 Simplified list of resources// ==
  The version 3.0 REST API has just five main resources:
@@ -492,7 +492,7 @@
  This and changes in the URLs and query parameters on the data, availability and metadata resources means that, with the exception of schema queries, the version 3.0 API is not backwardly compatible.
--== 5.2 Improved data queries ==
++== //5.2 Improved data queries// ==
  Data queries have been changed to provide more granular selections from contexts wider than just a Dataflow.
@@ -518,12 +518,11 @@
  /data/dataflow/ESTAT/ICP?c[REF_AREA]=DE&c[ICP_ITEM]=sw:01&c[TIME_PERIOD]=ge:2015 Operators include:
--(% style="width:531.039px" %)
--|(% style="width:151px" %)eq|(% style="width:378px" %)Equals
--|(% style="width:151px" %)ne|(% style="width:378px" %)Not equal to
--|(% style="width:151px" %)le|(% style="width:378px" %)Less than
--|(% style="width:151px" %)ge|(% style="width:378px" %)Greater than or equal to
--|(% style="width:151px" %)sw|(% style="width:378px" %)Starts with
++|eq|Equals
++|ne|Not equal to
++|le|Less than
++|ge|Greater than or equal to
++|sw|Starts with
  === Support for multiple keys ===
@@ -531,7 +531,7 @@
  /data/dataflow/ESTAT/ICP/1.0.0/M…A.ANR,M…A.INX,M…B.CTG
--== 5.3 Improved reference metadata queries ==
++== //5.3 Improved reference metadata queries// ==
  Reference metadata queries have been improved with a number of new options to retrieve metadata reports.
@@ -547,7 +547,7 @@
  /metadata/structure/datastructure/BIS/BIS_CBS/1.0
--== 5.4 Structural metadata maintenance ==
++== //5.4 Structural metadata maintenance// ==
  Support has been added for maintenance of structural metadata.
@@ -555,7 +555,7 @@
  = 6 XML, JSON, CSV and EDI Transmission formats =
--== 6.1 SDMX-ML ==
++== //6.1 SDMX-ML// ==
  The SDMX-ML XML messages have been modified and updated for version 3.0. While they broadly follow the same principles, there have been significant changes which break backward compatibility.
@@ -565,49 +565,47 @@
  Additionally, the way the individual artefacts are organised into ‘collections’ within the message has been significantly revised with a simpler flat structure adopted as set out in the following table:
--(% style="width:1102.04px" %)
--|(% style="width:321px" %)**Artefact type**|(% style="width:351px" %)**Version 2.1 Collection**|(% style="width:426px" %)**Version 3.0 Collection**
--|(% style="width:321px" %)AgencyScheme|(% style="width:351px" %)OrganisationSchemes|(% style="width:426px" %)AgencySchemes
--|(% style="width:321px" %)DataConsumerScheme|(% style="width:351px" %)OrganisationSchemes|(% style="width:426px" %)DataConsumerSchemes
--|(% style="width:321px" %)DataProviderScheme|(% style="width:351px" %)OrganisationSchemes|(% style="width:426px" %)DataProviderSchemes
--|(% style="width:321px" %)MetadataProviderScheme|(% style="width:351px" %)OrganisationSchemes|(% style="width:426px" %)MetadataProviderSchemes
--|(% style="width:321px" %)OrganisationUnitScheme|(% style="width:351px" %)OrganisationSchemes|(% style="width:426px" %)OrganisationUnitSchemes
--|(% style="width:321px" %)GeographicCodelist|(% style="width:351px" %)Codelists|(% style="width:426px" %)GeographicCodelists
--|(% style="width:321px" %)GeoGridCodelist|(% style="width:351px" %)Codelists|(% style="width:426px" %)GeoGridCodelists
--|(% style="width:321px" %)ConceptScheme|(% style="width:351px" %)Concepts|(% style="width:426px" %)ConceptSchemes
--|(% style="width:321px" %)ValueList|(% style="width:351px" %)Codelists|(% style="width:426px" %)ValueLists
--|(% style="width:321px" %)StructureMap|(% style="width:351px" %)StructureMappings|(% style="width:426px" %)StructureMaps
--|(% style="width:321px" %)RepresentationMap|(% style="width:351px" %)StructureMappings|(% style="width:426px" %)RepresentationMaps
--|(% style="width:321px" %)ConceptSchemeMap|(% style="width:351px" %)StructureMappings|(% style="width:426px" %)ConceptSchemeMaps
--|(% style="width:321px" %)CategorySchemeMap|(% style="width:351px" %)StructureMappings|(% style="width:426px" %)CategorySchemeMaps
--|(% style="width:321px" %)OrganisationSchemeMap|(% style="width:351px" %)StructureMappings|(% style="width:426px" %)OrganisationSchemeMaps
--|(% style="width:321px" %)ReportingTaxonomyMap|(% style="width:351px" %)StructureMappings|(% style="width:426px" %)ReportingTaxonomyMaps
--|(% style="width:321px" %)DataConstraint|(% style="width:351px" %)Constraints|(% style="width:426px" %)DataConstraints
--|(% style="width:321px" %)MetadataConstraint|(% style="width:351px" %)Constraints|(% style="width:426px" %)MetadataConstraints
--|(% style="width:321px" %)MetadataProvisionAgreement|(% style="width:351px" %)ProvisionAgreement|(% style="width:426px" %)MetadataProvisionAgreements
--|(% style="width:321px" %)CustomTypeScheme|(% style="width:351px" %)CustomTypes|(% style="width:426px" %)CustomTypeSchemes
--|(% style="width:321px" %)VtlMappingScheme|(% style="width:351px" %)VtlMappings|(% style="width:426px" %)VtlMappingSchemes
--|(% style="width:321px" %)NamePersonalisationScheme|(% style="width:351px" %)NamePersonalisations|(% style="width:426px" %)NamePersonalisationSchemes
--|(% style="width:321px" %)RulesetScheme|(% style="width:351px" %)Rulesets|(% style="width:426px" %)RulesetSchemes
--|(% style="width:321px" %)TransformationScheme|(% style="width:351px" %)Transformations|(% style="width:426px" %)TransformationSchemes
--|(% style="width:321px" %)UserDefinedOperatorScheme|(% style="width:351px" %)UserDefinedOperators|(% style="width:426px" %)UserDefinedOperatorSchemes
++|**Artefact type**|**Version 2.1 Collection**|**Version 3.0 Collection**
++|AgencyScheme|OrganisationSchemes|AgencySchemes
++|DataConsumerScheme|OrganisationSchemes|DataConsumerSchemes
++|DataProviderScheme|OrganisationSchemes|DataProviderSchemes
++|MetadataProviderScheme|OrganisationSchemes|MetadataProviderSchemes
++|OrganisationUnitScheme|OrganisationSchemes|OrganisationUnitSchemes
++|GeographicCodelist|Codelists|GeographicCodelists
++|GeoGridCodelist|Codelists|GeoGridCodelists
++|ConceptScheme|Concepts|ConceptSchemes
++|ValueList|Codelists|ValueLists
++|StructureMap|StructureMappings|StructureMaps
++|RepresentationMap|StructureMappings|RepresentationMaps
++|ConceptSchemeMap|StructureMappings|ConceptSchemeMaps
++|CategorySchemeMap|StructureMappings|CategorySchemeMaps
++|OrganisationSchemeMap|StructureMappings|OrganisationSchemeMaps
++|ReportingTaxonomyMap|StructureMappings|ReportingTaxonomyMaps
++|DataConstraint|Constraints|DataConstraints
++|MetadataConstraint|Constraints|MetadataConstraints
++|MetadataProvisionAgreement|ProvisionAgreement|MetadataProvisionAgreements
++|CustomTypeScheme|CustomTypes|CustomTypeSchemes
++|VtlMappingScheme|VtlMappings|VtlMappingSchemes
++|NamePersonalisationScheme|NamePersonalisations|NamePersonalisationSchemes
++|RulesetScheme|Rulesets|RulesetSchemes
++|TransformationScheme|Transformations|TransformationSchemes
++|UserDefinedOperatorScheme|UserDefinedOperators|UserDefinedOperatorSchemes
  No changes have been made to the way the following artefacts are organised in the structure message:
--(% style="width:1106.04px" %)
--|(% style="width:326px" %)**Artefact type**|(% style="width:776px" %)**Collection**
--|(% style="width:326px" %)Dataflow|(% style="width:776px" %)Dataflows
--|(% style="width:326px" %)Metadataflow|(% style="width:776px" %)Metadataflows
--|(% style="width:326px" %)CategoryScheme|(% style="width:776px" %)CategorySchemes
--|(% style="width:326px" %)Categorisation|(% style="width:776px" %)Categorisations
--|(% style="width:326px" %)Codelist|(% style="width:776px" %)Codelists
--|(% style="width:326px" %)Hierarchy|(% style="width:776px" %)Hierarchies
--|(% style="width:326px" %)HierarchyAssociation|(% style="width:776px" %)HierarchyAssociations
--|(% style="width:326px" %)MetadataStructure|(% style="width:776px" %)MetadataStructures
--|(% style="width:326px" %)DataStructure|(% style="width:776px" %)DataStructures
--|(% style="width:326px" %)ReportingTaxonomy|(% style="width:776px" %)ReportingTaxonomies
--|(% style="width:326px" %)Process|(% style="width:776px" %)Processes
--|(% style="width:326px" %)ProvisionAgreement|(% style="width:776px" %)ProvisionAgreements
++|**Artefact type**|**Collection**
++|Dataflow|Dataflows
++|Metadataflow|Metadataflows
++|CategoryScheme|CategorySchemes
++|Categorisation|Categorisations
++|Codelist|Codelists
++|Hierarchy|Hierarchies
++|HierarchyAssociation|HierarchyAssociations
++|MetadataStructure|MetadataStructures
++|DataStructure|DataStructures
++|ReportingTaxonomy|ReportingTaxonomies
++|Process|Processes
++|ProvisionAgreement|ProvisionAgreements
  From version 3.0, collections can appear in any order within a structure message.
@@ -641,7 +641,7 @@
  The option to reference structures using Agency, ID and Version has been removed. From SDMX version 3.0 URN is used for all referencing purposes with the exception of local references such as where groups reference dimensions within a DSD.
--== 6.2 SDMX-JSON ==
++== //6.2 SDMX-JSON// ==
  Like SDMX-ML, the SDMX-JSON messages have been significantly modified and updated for version 3.0. They are not backwardly compatible with version 2.1.
@@ -661,7 +661,7 @@
  As for SDMX-ML, the option to reference structures using Agency, ID and Version has been removed with URN used for all non-local referencing purposes.
--== 6.3 SDMX-CSV ==
++== //6.3 SDMX-CSV// ==
  CSV in SDMX is used transmission of data and reference metadata only.
@@ -679,7 +679,7 @@
  The SDMX-CSV metadata message is new for version 3.0 and, like the SDMX-ML and SDMX-JSON equivalents, is used for the transmission reference metadata sets.
--=== 6.4 EDI deprecation ===
++=== //6.4 EDI deprecation// ===
  The EDI format for transmission of both structures and data has been deprecated. Version 3.0 is therefore not backwardly compatible with legacy EDI messages.

SUZ.Methodology.Code.MethodologyClass[0]