Changes for page SDMX 3.1 Standards. Section 1. Framework

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@@ -18,51 +18,51 @@
  **Section 1** **Framework for [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Technical Standards** – this document providing an introduction to the technical standards.
--**Section 2** **[[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]** - 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.
++**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.
--**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.
++**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.
--**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.
++**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.
--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||rel="noopener noreferrer" target="_blank"]]): [[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
++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||rel="noopener noreferrer" target="_blank"]]): sdmx-twg/sdmx-rest – REST API
  Technical specifications for the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] RESTful web services application programming interfaces (API).
  (% class="wikigeneratedid" id="Hsdmx-twg2Fsdmx-ml2013SDMX-ML" %)
--**[[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]]**
++**sdmx-twg/sdmx-ml – SDMX-ML**
  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.
  (% class="wikigeneratedid" id="Hsdmx-twg2Fsdmx-json2013SDMX-JSON" %)
--**[[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]]**
++**sdmx-twg/sdmx-json – SDMX-JSON**
  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.
  (% class="wikigeneratedid" id="Hsdmx-twg2Fsdmx-csv2013SDMX-CSV" %)
--**[[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]]**
++**sdmx-twg/sdmx-csv – SDMX-CSV**
  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]].
  The following sections are obsolete:
--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
++Section 3 - [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] - replaced by the sdmx-twg/sdmx-ml GitHub repository
  Section 4 - [[SDMX-EDI>>doc:sdmx:Glossary 2\.1.SDMX-EDI.WebHome]]
--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]]
++Section 7 - API - replaced by the sdmx-twg/sdmx-rest GitHub repository [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]
  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]].
  = 2 Change History =
--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.
++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.
--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]].
++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]].
--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.
++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.
--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.
++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.
  == 2.1 Major Changes from 1.0 to 2.0 ==
--* **[[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.
++* **[[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.
  * **[[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]].
  ** **[[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 lists>>doc:sdmx:Glossary 2\.1.Hierarchical code list.WebHome]] 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.
@@ -75,14 +75,14 @@
  * **Optimization for XML Technologies:** Implementation has shown that it is possible to better organize the XML schemas for use within common technology development tools which work with XML. These changes are primarily focused on leveraging the objectoriented features of W3C XML Schema to allow for easier processing of [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data and metadata.
  * **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.
  * **Technical Bugs:** Some minor technical bugs have been identified in the registry interfaces and elsewhere. These bugs have been addressed.
--* **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.
--* **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]].
++* **Support for Non-Time-Series 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.
++* **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]].
  * **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]].
--* **Support for partial [[item schemes>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a [[code list>>doc:sdmx:Glossary 2\.1.Code list.WebHome]]: **The (% style="color:#e74c3c" %)concept(%%) of a partial (subset) [[item scheme>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a partial [[code list>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] for use in exchange scenarios has been introduced**.**
++* **Support for partial [[item schemes>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a [[code list>>doc:sdmx:Glossary 2\.1.Code list.WebHome]]: **The concept of a partial (subset) [[item scheme>>doc:sdmx:Glossary 2\.1.Item scheme.WebHome]] such as a partial [[code list>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] for use in exchange scenarios has been introduced**.**
  == 2.3 Major Changes from 2.1 to 3.0 ==
--[[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:
++[[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:
  (% class="wikigeneratedid" id="HInformationModel" %)
  **Information Model**
@@ -93,10 +93,10 @@
  * Support for [[code list>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] extension and discriminated union of [[code lists>>doc:sdmx:Glossary 2\.1.Code list.WebHome]]
  * Improvements to structure mapping
  * Improvements to [[code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] [[hierarchies>>doc:sdmx:Glossary 2\.1.Hierarchy.WebHome]] for data discovery
--* Improvements to (% style="color:#e74c3c" %)constraints
++* Improvements to [[constraints>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]]
  (% class="wikigeneratedid" id="HVersioningofStructuralMetadataArtefacts" %)
--**Versioning of [[Structural Metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] [[Artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]**
++**Versioning of Structural Metadata Artefacts**
  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||rel="noopener noreferrer" target="_blank"]])
@@ -111,24 +111,24 @@
  (% class="wikigeneratedid" id="HSOAPWebServicesAPI" %)
  **SOAP Web Services API**
--* The SOAP web services API has been deprecated with (% style="color:#e74c3c" %)version(%%) 3.0 standardising on REST
++* The SOAP web services API has been deprecated with version 3.0 standardising on REST
  (% class="wikigeneratedid" id="HXML2CJSON2CCSVandEDITransmissionformats" %)
  **XML, JSON, CSV and EDI Transmission formats**
--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
++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
--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.
++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.
  The principle breaking changes are:
  * 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.
--* SOAP API – Deprecation of the SOAP API means that existing systems designed to use SOAP will not work with (% style="color:#e74c3c" %)version(%%) 3.0 registries.
--* [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] – [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 and earlier structure, data and metadata XML messages are not valid in (% style="color:#e74c3c" %)version(%%) 3.0. Specifically: legacy data messages including Generic, Compact and Utility are no longer supported. The remaining Structure Specific data message has been changed to support new features such as reporting of [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] as part of the [[dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], Structure messages have a number of breaking changes, principally modification to the information model, removal of the agency-(% style="color:#e74c3c" %)version(%%)-id option for referencing [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] and changes to the way the structures are organised into ‘collections’ within the message.
--* [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] – [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 structure, data and metadata JSON messages are not valid in (% style="color:#e74c3c" %)version(%%) 3.0. The data message has been changed to support the improved REST data queries, in particular the ability to retrieve in one operation data from multiple [[datasets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] with potentially different [[Data Structure Definitions>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]]. Breaking changes similar to those for the [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] transmission format have been made to the structure message.
--* [[SDMX-CSV>>doc:sdmx:Glossary 2\.1.SDMX-CSV.WebHome]] - The CSV data and [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] messages are not backwardly compatible with those under (% style="color:#e74c3c" %)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>>doc:sdmx:Glossary 2\.1.SDMX-EDI.WebHome]] – Deprecation of the EDI transmission format means that existing systems designed to send or receive structures or data in EDI will not work with (% style="color:#e74c3c" %)version(%%) 3.0 registries.
--* Information Model – Several structures have been changed in the (% style="color:#e74c3c" %)version(%%) 3.0 model and three removed. For these reasons the (% style="color:#e74c3c" %)version(%%) 3.0 model is not directly compatible with (% style="color:#e74c3c" %)version(%%) 2.1 or earlier, although conversion of specific [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is possible under some circumstances. Loss of information during the conversion process however means that in cases like structure mapping, the conversion is not reversible i.e. it is not possible to recreate the 2.1 structure once it has been converted to the 3.0 model.
++* SOAP API – Deprecation of the SOAP API means that existing systems designed to use SOAP will not work with version 3.0 registries.
++* [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] – [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 and earlier structure, data and metadata XML messages are not valid in version 3.0. Specifically: legacy data messages including Generic, Compact and Utility are no longer supported. The remaining Structure Specific data message has been changed to support new features such as reporting of [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] as part of the [[dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], Structure messages have a number of breaking changes, principally modification to the information model, removal of the agency-version-id option for referencing [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] and changes to the way the structures are organised into ‘collections’ within the message.
++* [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]] – [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 structure, data and metadata JSON messages are not valid in version 3.0. The data message has been changed to support the improved REST data queries, in particular the ability to retrieve in one operation data from multiple [[datasets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] with potentially different [[Data Structure Definitions>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]]. Breaking changes similar to those for the [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] transmission format have been made to the structure message.
++* [[SDMX-CSV>>doc:sdmx:Glossary 2\.1.SDMX-CSV.WebHome]] - The CSV data and [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] 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>>doc:sdmx:Glossary 2\.1.SDMX-EDI.WebHome]] – Deprecation of the EDI transmission format means that existing systems designed to send or receive structures or data in EDI will not work with version 3.0 registries.
++* Information Model – Several structures have been changed in the version 3.0 model and three removed. For these reasons the version 3.0 model is not directly compatible with version 2.1 or earlier, although conversion of specific [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is possible under some circumstances. Loss of information during the conversion process however means that in cases like structure mapping, the conversion is not reversible i.e. it is not possible to recreate the 2.1 structure once it has been converted to the 3.0 model.
  The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 3.0 Major Changes document provides more information including an analysis of the breaking changes.
@@ -139,19 +139,19 @@
  * Addition of Dimension Constraint property to a Dataflow
  * Addition of evolving structure property to a Data Structure Definition
--* Remove version property on Categorisation
++* Remove [[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]] property on Categorisation
  * Simplification of Constraints
  ** Removal of Advanced Release Calendar
  ** Removal of Role, Data Constraints only restrict data that can be reported
--** Restrict constraint targets to Identifiable structures (not URLs)
++** Restrict [[constraint>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]] targets to Identifiable structures (not URLs)
  ** Addition of Availability Constraint to define actual data
  (% class="wikigeneratedid" id="HDocumentation" %)
  **Documentation**
--* Registering Reference Metadata removed from documentation, to align with XML Registration object which is unable to reference a Metadata Provision, and REST API which is unable to query for registered reference metadata sources.
++* Registering [[Reference Metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] removed from documentation, to align with XML Registration object which is unable to reference a Metadata Provision, and REST API which is unable to query for registered [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] sources.
--The SDMX standards specified here are designed to support the requirements of all of these automation processes and technologies.
++The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standards specified here are designed to support the requirements of all of these automation processes and technologies.
  = 3 Processes and Business Scope =
@@ -159,7 +159,7 @@
  [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] identifies three basic process patterns regarding the exchange of statistical data and metadata. These can be described as follows:
--1. //**[[Bilateral exchange>>doc:sdmx:Glossary 2\.1.Bilateral exchange.WebHome]]**~:// All aspects of the exchange process are agreed between counterparties, including the mechanism for exchange of data and metadata, the formats, the frequency or schedule, and the mode used for communications regarding the exchange. This is perhaps the most common process pattern.
++1. //**Bilateral exchange**~:// All aspects of the exchange process are agreed between counterparties, including the mechanism for exchange of data and metadata, the formats, the frequency or schedule, and the mode used for communications regarding the exchange. This is perhaps the most common process pattern.
 . //**Gateway exchange**~:// Gateway exchanges are an organized set of [[bilateral exchanges>>doc:sdmx:Glossary 2\.1.Bilateral exchange.WebHome]], in which several data and metadata collecting organizations or individuals agree to exchange the collected information with each other in a single, known format, and according to a single, known process. This pattern has the effect of reducing the burden of managing multiple [[bilateral exchanges>>doc:sdmx:Glossary 2\.1.Bilateral exchange.WebHome]] (in data and metadata collection) across the sharing organizations/individuals. This is also a very common process pattern in the statistical area, where communities of institutions agree on ways to gain efficiencies within the scope of their collective responsibilities.
 . //**Data-sharing exchange**~:// Open, freely available data formats and process patterns are known and standard. Thus, any organization or individual can use any counterparty’s data and metadata (assuming they are permitted access to it). This model requires no bilateral agreement, but only requires that data and metadata providers and consumers adhere to the standards.
@@ -176,11 +176,11 @@
  == 3.3 Statistical Data and Metadata ==
--To avoid confusion about which "data" and "metadata" are the intended content of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] formats specified here, a statement of scope is offered. Statistical "data" are sets of often numeric observations which typically have time associated with them. They are associated with a set of metadata values, representing specific (% style="color:#e74c3c" %)concepts(%%), which act as identifiers and descriptors of the data. These metadata values and (% style="color:#e74c3c" %)concepts(%%) can be understood as the named [[dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] of a multi-dimensional co-ordinate system, describing what is often called a "cube" of data.
++To avoid confusion about which "data" and "metadata" are the intended content of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] formats specified here, a statement of scope is offered. Statistical "data" are sets of often numeric observations which typically have time associated with them. They are associated with a set of metadata values, representing specific concepts, which act as identifiers and descriptors of the data. These metadata values and concepts can be understood as the named [[dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] of a multi-dimensional co-ordinate system, describing what is often called a "cube" of data.
  [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] identifies a standard technique for modelling, expressing, and understanding the structure of this multi-dimensional "cube", allowing automated processing of data from a variety of sources. This approach is widely applicable across types of data and attempts to provide the simplest and most easily comprehensible technique that will support the exchange of this broad set of data and related metadata.
--The term "metadata" is very broad indeed. A distinction can be made between “structural” metadata – those (% style="color:#e74c3c" %)concepts(%%) used in the description and identification of statistical data and metadata – and “reference” metadata – the larger set of (% style="color:#e74c3c" %)concepts(%%) that describe and qualify statistical [[data sets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] and processing more generally, and which are often associated not with specific observations or [[series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] of data, but with entire collections of data or even the institutions which provide that data.
++The term "metadata" is very broad indeed. A distinction can be made between “structural” metadata – those concepts used in the description and identification of statistical data and metadata – and “reference” metadata – the larger set of concepts that describe and qualify statistical [[data sets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] and processing more generally, and which are often associated not with specific observations or [[series>>doc:sdmx:Glossary 2\.1.Series.WebHome]] of data, but with entire collections of data or even the institutions which provide that data.
  The [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]] provides for the structuring not only of data, but also of “reference” metadata. While these [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] structures exist independent of the data and its [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]], they are often linked. The [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]] provides for the attachment of [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] to any part of the data or [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]], as well as for the reporting and exchange of the [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] and its structural descriptions. This function of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standards supports many aspects of data quality initiatives, allowing as it does for the exchange of metadata in its broadest sense, of which quality-related metadata is a major part.
@@ -194,13 +194,13 @@
  This document specifies the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standards designed to facilitate exchanges based on any of these process patterns, and shows how [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] offers advantages in all cases. It is possible to agree bilaterally to use a standard format (such as [[SDMX-ML>>doc:sdmx:Glossary 2\.1.SDMX-ML.WebHome]] or [[SDMX-JSON>>doc:sdmx:Glossary 2\.1.SDMX-JSON.WebHome]]); it is possible for data senders in a gateway process to use a standard format for [[data exchange>>doc:sdmx:Glossary 2\.1.Data exchange.WebHome]] with each other, or with any [[data providers>>doc:sdmx:Glossary 2\.1.Data provider.WebHome]] who agree to do so; it is possible to agree to use the full set of [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standards to support a common data-sharing process of exchange, whether based on an [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-conformant registry or some other architecture.
--The standards specified here specifically support a data-sharing process based on the use of central registry services. Registry services provide visibility into the data and metadata existing within the community, and support the access and use of this data and metadata by providing a set of triggers for automated processing. The data or metadata itself is not stored in a central registry – these services merely provide a useful set of metadata about the data (and additional metadata) in a known location, so that users/applications can easily locate and obtain whatever data and/or metadata is registered. The use of standards for all data, metadata, and the registry services themselves is ubiquitous, permitting a high (% style="color:#e74c3c" %)level(%%) of automation within a data-sharing community.
++The standards specified here specifically support a data-sharing process based on the use of central registry services. Registry services provide visibility into the data and metadata existing within the community, and support the access and use of this data and metadata by providing a set of triggers for automated processing. The data or metadata itself is not stored in a central registry – these services merely provide a useful set of metadata about the data (and additional metadata) in a known location, so that users/applications can easily locate and obtain whatever data and/or metadata is registered. The use of standards for all data, metadata, and the registry services themselves is ubiquitous, permitting a high level of automation within a data-sharing community.
  It should be pointed out that these different process models are not mutually exclusive – a single system capable of expressing data and metadata in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-conformant formats could support all three scenarios. Different standards may be applicable to different processes (for example, many registry services interfaces are used only in a data-sharing scenario) but all have a common basis in a shared information model.
  In addition to looking at collection and reporting, it is also important to consider the dissemination of data. Data and metadata – no matter how they are exchanged between counterparties in the process of their development and creation – are all eventually supplied to an end user of some type. Often, this is through specific applications inside of institutions. But more and more frequently, data and metadata are also published on websites in various formats. The dissemination of data and its accompanying metadata on the web is a focus of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standards. Standards for statistical data and metadata allow improvements in the publication of data – it becomes more easily possible to process a standard format once the data is obtained, and the data and metadata are linked together, making the comprehension and further processing of the data easier.
--In discussions of statistical data, there are many aspects of its dissemination which impact data quality: data discovery, ease of use, and [[timeliness>>doc:sdmx:Glossary 2\.1.Timeliness.WebHome]]. [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standards provide support for all of these aspects of data dissemination. Standard data formats promote ease of use, and provide links to relevant metadata. The (% style="color:#e74c3c" %)concept(%%) of registry services means that data and metadata can more easily be discovered. [[Timeliness>>doc:sdmx:Glossary 2\.1.Timeliness.WebHome]] is improved throughout the data lifecycle by increases in efficiency, promoted through the availability of metadata and ease of use.
++In discussions of statistical data, there are many aspects of its dissemination which impact data quality: data discovery, ease of use, and [[timeliness>>doc:sdmx:Glossary 2\.1.Timeliness.WebHome]]. [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] standards provide support for all of these aspects of data dissemination. Standard data formats promote ease of use, and provide links to relevant metadata. The concept of registry services means that data and metadata can more easily be discovered. [[Timeliness>>doc:sdmx:Glossary 2\.1.Timeliness.WebHome]] is improved throughout the data lifecycle by increases in efficiency, promoted through the availability of metadata and ease of use.
  It is important to note that [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] is primarily focused on the //exchange// and //dissemination// of statistical data and metadata. There may also be many uses for the standard model and formats specified here in the context of internal processing of data that are not concerned with the exchange between organizations and users, however. It is felt that a clear, standard formatting of data and metadata for the purposes of exchange and dissemination can also facilitate internal processing by organizations and users, but this is not the focus of the specification.