Wiki source code of SDMX 3.1 Standards. Section 1. Summary of Major Changes and New Functionality

Version 3.3 by Elena on 2025/07/01 19:02

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	5	Revision History
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	7	(% style="width:991.835px" %)
	8	\|(% style="width:154px" %)Revision \|(% style="width:249px" %)Date \|(% style="width:586px" %)Contents
	9	\|(% style="width:154px" %)DRAFT 1.0\|(% style="width:249px" %)December 2024\|(% style="width:586px" %)Draft release updated for SDMX 3.1 for public consultation
	10	\|(% style="width:154px" %)1.0\|(% style="width:249px" %)May 2025\|(% style="width:586px" %)Public release for SDMX 3.1
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1.2	12	= 1. Overview =
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1.7	14	[[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.1 is a minor revision to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.0 Standard which introduces a limited set of changes, which cover the following:
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1.5	16	Information Model
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1.7	18	* Support for [[Dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]] to reference a subset of [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] from a [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]]
3.2	19	* Simplification to Data (% style="color:#e74c3c" %)[[Constraints>>doc:sdmx:Glossary.Constraint.WebHome]]
	20	* Addition of Availability (% style="color:#e74c3c" %)[[Constraints>>doc:sdmx:Glossary.Constraint.WebHome]]
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1.5	22	Documentation
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1.7	24	Registering [[Reference Metadata>>doc:sdmx:Glossary.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.Reference metadata.WebHome]] sources.
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1.5	26	Breaking Changes
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3.2	28	* Remove (% style="color:#e74c3c" %)[[version>>doc:sdmx:Glossary.Version.WebHome]](%%) property on Categorisation
1.7	29	* Removal of Advanced [[Release Calendar>>doc:sdmx:Glossary.Release policy - release calendar.WebHome]]
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1.5	31	Content of the Document
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1.7	33	The remainder of this document contains a summary of the changes. More detailed information can be found in the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.1 Technical Specifications, in particular:
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	35	Section 2 – Information Model
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	37	Section 5 – Registry Specification
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	39	Section 6 – Technical Notes
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1.7	41	[[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] TWG GitHub for the REST API and the XML and JSON formats
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	43	= 2. Summary of Breaking Changes in 3.1 =
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3.2	45	Version 3.1 introduces breaking changes, in the model in the following areas:
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	47	== 2.1 Removal of Advanced Release Calendar ==
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3.2	49	The Data (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) was simplified to become a cohesive structural [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] focussed solely on the restriction of values that can be reported. As part of this remodelling the Advanced [[Release Calendar>>doc:sdmx:Glossary.Release policy - release calendar.WebHome]] was removed as it does not play a restrictive role.
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	51	//Guidance for Implementors//
1.7	52	[[Reference Metadata>>doc:sdmx:Glossary.Reference metadata.WebHome]] reported against a [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] and / or [[Provision Agreement>>doc:sdmx:Glossary.Provision agreement.WebHome]] can be used as an alternative to the Advanced [[Release Calendar>>doc:sdmx:Glossary.Release policy - release calendar.WebHome]].
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1.3	54	== 2.2 Removal of Version on Categorisation ==
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3.2	56	The Categorisation structural [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] has no use case for undergoing (% style="color:#e74c3c" %)[[version>>doc:sdmx:Glossary.Version.WebHome]](%%) changes, the (% style="color:#e74c3c" %)[[version>>doc:sdmx:Glossary.Version.WebHome]](%%) was therefore removed.
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1.6	58	//Guidance for Implementors//
3.2	59	If multiple (% style="color:#e74c3c" %)[[versions>>doc:sdmx:Glossary.Version.WebHome]](%%) of a Categorisation exist where the source or target differs, these Categorisations should be given a unique ID.
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1.3	61	= 3. Information Model =
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	63	The changes to the information model support two distinct use cases:
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1.7	65	1. Horizontally complex [[Data Structure Definitions>>doc:sdmx:Glossary.Data structure definition.WebHome]] (DSDs)
3.2	66	1. Additional cohesion to the Data (% style="color:#e74c3c" %)[[Constraints>>doc:sdmx:Glossary.Constraint.WebHome]](%%) model
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	68	These changes are described in below.
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1.4	70	== 3.1 Horizontally Complex Data Structure Definitions ==
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3.2	72	An explanation of this use case, with additional details can be found under Section 6 - Technical Notes, under heading ‘10.3 [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%)’.
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	74	The following changes to the model have been made to satisfy this use case.
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1.9	76	Data Structure Definition
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3.2	78	The [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] has a new ‘evolving structure’ property, this is a Boolean property, when set to ‘true’ it indicates to the users of the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] that new [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] may be added without the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] undergoing a change to its major (% style="color:#e74c3c" %)[[version>>doc:sdmx:Glossary.Version.WebHome]](%%) number.
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1.9	80	Dataflow
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3.2	82	The [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] has a new [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) property, which is used to reference a subset of [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] which it uses from the referenced [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
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3.2	84	The [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) fixes the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] of the [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] enabling the referenced [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] to have new [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] added without the need to change the major (% style="color:#e74c3c" %)[[version>>doc:sdmx:Glossary.Version.WebHome]](%%) number.
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3.2	86	The [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) property is only required if the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] sets the evolving structure property to true.
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1.4	88	== 3.2 Constraint Cohesion ==
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3.2	90	The (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) model in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.1 has been made more cohesive by separating the Data (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) into two distinct structures; the Data (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) which describes reporting restrictions, and the Availability (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%), which describes data content from a [[data source>>doc:sdmx:Glossary.Data source.WebHome]]. In [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.0 these distinctions were made using the ‘type’ property on a Data (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%).
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3.2	92	Data [[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]]
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3.2	94	The Data (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) has had the ‘type’ property removed; the Data (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.1 is always used to describe restrictions on content for data reporting purposes.
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3.2	96	The attachment of the Data (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.0 included [[Data Sources>>doc:sdmx:Glossary.Data source.WebHome]], in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] 3.1 these attachments have been removed as these are not relevant for restricting reported data.
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3.2	98	Availability [[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]]
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3.2	100	The Availability (% style="color:#e74c3c" %)[[Constraint>>doc:sdmx:Glossary.Constraint.WebHome]](%%) is a new Structure introduced to describe data that exists, it is generated in the response to the Availability REST API. It is not a maintained structure, and as such has no [[maintenance agency>>doc:sdmx:Glossary.Maintenance agency.WebHome]], identity or (% style="color:#e74c3c" %)[[version>>doc:sdmx:Glossary.Version.WebHome]]