Changes for page SDMX 3.1 Standards. Section 1. Framework

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	1	+Adjustment\|Artefact\|Attribute\|Bilateral exchange\|Categorisation\|Category\|Category Scheme\|Code\|Codelist\|Comment\|Component\|Concept\|Concept Scheme\|Constraint\|Coverage\|Cross-domain Concept\|Currency\|Data Consumer\|Data Provider\|Data Set\|Data Source\|Data Structure Definition\|Data exchange\|Dataflow\|Dimension\|Frequency of observation\|Global Registry\|Hierarchical Codelist\|Hierarchy\|Incremental update\|Item Scheme\|Language\|Maintenance agency\|Measure\|Metadata Set\|Metadata Structure Definition\|Metadata repository\|Metadataflow\|Notification\|Provision Agreement\|Reference metadata\|Release policy - release calendar\|Reporting Taxonomy\|Representation\|SDMX Information Model\|SDMX Registry\|SDMX Technical Specification\|SDMX-CSV\|SDMX-EDI\|SDMX-JSON\|SDMX-ML\|Series\|Statistical Data and Metadata eXchange\|Statistical classification\|Statistical subject-matter domain\|Statistical unit\|Structural metadata\|Subscription\|Timeliness\|Validation and Transformation Language\|Version

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  For many years the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] initiative has been fostering and supporting the development of a standard calculation [[language>>doc:sdmx:Glossary 2\.1.Language.WebHome]], called [[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]]). A blueprint for defining calculations was already described in the original [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 specifications (package 13 of the Information Model - “Transformations and Expressions”). It was just a basic framework that required further developments to became operational in order to achieve a calculation [[language>>doc:sdmx:Glossary 2\.1.Language.WebHome]] able to manipulate [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]].
--These developments started in late 2012 and were put in charge of the [[Validation and Transformation Language>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Task Force ([[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] TF), which included members of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Technical Working Group (TWG) and Statistical Working Group (SWG), besides experts coming from the DDI and GSIM communities. The intent was to define a standard [[language>>doc:sdmx:Glossary 2\.1.Language.WebHome]] to be implemented in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] and applicable also to GSIM and DDI. This brought to the publication of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 1.0 in 2015. Then new requirements came from a number of proofs of (% style="color:#e74c3c" %)concepts(%%) and tests of [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 1.0 made by several organisations and triggered a large improvement of the [[language>>doc:sdmx:Glossary 2\.1.Language.WebHome]]. A new provisional (% style="color:#e74c3c" %)version(%%), the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 1.1, was released in public consultation in 2017. The high number of [[comments>>doc:sdmx:Glossary 2\.1.Comment.WebHome]] received triggered another phase of intensive work, with the main goal of achieving a more robust and forward compatible (% style="color:#e74c3c" %)version(%%). Finally, the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 2.0 was published between April and July 2018 (see the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] website).
++These developments started in late 2012 and were put in charge of the [[Validation and Transformation Language>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Task Force ([[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] TF), which included members of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Technical Working Group (TWG) and Statistical Working Group (SWG), besides experts coming from the DDI and GSIM communities. The intent was to define a standard [[language>>doc:sdmx:Glossary 2\.1.Language.WebHome]] to be implemented in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] and applicable also to GSIM and DDI. This brought to the publication of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 1.0 in 2015. Then new requirements came from a number of proofs of concepts and tests of [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 1.0 made by several organisations and triggered a large improvement of the [[language>>doc:sdmx:Glossary 2\.1.Language.WebHome]]. A new provisional version, the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 1.1, was released in public consultation in 2017. The high number of [[comments>>doc:sdmx:Glossary 2\.1.Comment.WebHome]] received triggered another phase of intensive work, with the main goal of achieving a more robust and forward compatible version. Finally, the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 2.0 was published between April and July 2018 (see the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] website).
  The implementation of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 2.0 in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] started in late 2018 and was published as an incremental revision to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 standards in July 2020. It allows users to write [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] 2.0 programs for validating and transforming [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data, to store these programs in a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] metadata registry and to exchange them through [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] messages, also together the definition of the data structures of the involved data.