Changes for page 12 Validation and Transformation Language (VTL)

Last modified by Helena K. on 2026/06/10 10:09

From 10.1 to 10.2 From 10.7 to 10.8

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edited by Helena K.
on 2026/06/10 09:49

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To version 10.7

edited by Helena K.
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@@ -26,7 +26,7 @@
  The alias of an [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] can be its URN (Universal Resource Name), an abbreviation of its URN or another user-defined name.
--In any case, the aliases used in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformations have to be (% style="color:#e74c3c" %)mapped(%%) to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] through the VtlMappingScheme and VtlMapping classes (see the section of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] IM relevant to the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]). A VtlMapping allows specifying the aliases to be used in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformations, Rulesets{{footnote}}See also the section "VTL-DL Rulesets" in the VTL Reference Manual.{{/footnote}} or User Defined Operators{{footnote}}The VTLMappings are used also for User Defined Operators (UDO). Although UDOs are envisaged to be defined on generic operands, so that the specific artefacts to be manipulated are passed as parameters at their invocation, it is also possible that an UDO invokes directly some specific SDMX artefacts. These SDMX artefacts have to be mapped to the corresponding aliases used in the definition of the UDO through the VtlMappingScheme and VtlMapping classes as well.{{/footnote}} to reference [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]. A VtlMappingScheme is a container for zero or more VtlMapping.
++In any case, the aliases used in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformations have to be mapped to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] through the VtlMappingScheme and VtlMapping classes (see the section of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] IM relevant to the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]). A VtlMapping allows specifying the aliases to be used in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformations, Rulesets{{footnote}}See also the section "VTL-DL Rulesets" in the VTL Reference Manual.{{/footnote}} or User Defined Operators{{footnote}}The VTLMappings are used also for User Defined Operators (UDO). Although UDOs are envisaged to be defined on generic operands, so that the specific artefacts to be manipulated are passed as parameters at their invocation, it is also possible that an UDO invokes directly some specific SDMX artefacts. These SDMX artefacts have to be mapped to the corresponding aliases used in the definition of the UDO through the VtlMappingScheme and VtlMapping classes as well.{{/footnote}} to reference [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]. A VtlMappingScheme is a container for zero or more VtlMapping.
  The correspondence between an alias and a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] must be one-to-one, meaning that a generic alias identifies one and just one [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] while a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is identified by one and just one alias. In other words, within a VtlMappingScheme an [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] can have just one alias and different [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] cannot have the same alias.
@@ -43,19 +43,19 @@
  * class-name
  * agency-id
  * maintainedobject-id
--* maintainedobject-(% style="color:#e74c3c" %)version
++* maintainedobject-version
  * container-object-id{{footnote}}The container-object-id can repeat and may not be present.{{/footnote}}
  * object-id
  The generic structure of the URN is the following:
--SDMXprefix.[[SDMX-IM>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]-package-name.class-name=agency-id:maintainedobject-id (maintainedobject-(% style="color:#e74c3c" %)version(%%)).*container-object-id.object-id
++SDMXprefix.[[SDMX-IM>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]-package-name.class-name=agency-id:maintainedobject-id (maintainedobject-version).*container-object-id.object-id
  The **SDMXprefix** is "urn:[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]:org", always the same for all [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]].
  The [[SDMX-IM>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]-package-name** **is the concatenation of the string** **"[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]].infomodel." with the package-name, which the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belongs to. For example, for referencing a [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] the [[SDMX-IM>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]-package-name is "[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]].infomodel.datastructure", because the class [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] belongs to the package "datastructure".
--The class-name is the name of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object class, which the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object belongs to (e.g., for referencing a [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] the class-name is "[[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]]"). The [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] can reference [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] that belong to the classes [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension, [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], DataAttribute, (% style="color:#e74c3c" %)Concept(%%), [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]].
++The class-name is the name of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object class, which the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object belongs to (e.g., for referencing a [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] the class-name is "[[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]]"). The [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] can reference [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] that belong to the classes [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension, [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], DataAttribute, [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]].
  The agency-id is the acronym of the agency that owns the definition of the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]], for example for the Eurostat [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] the agency-id is "ESTAT"). The agency-id can be composite (for example AgencyA.Dept1.Unit2).
@@ -66,10 +66,10 @@
  DataStructure maintainable class, the maintainedobject-id is the name of the DataStructure (dataStructure-id) which the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belongs to;
--* if the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a (% style="color:#e74c3c" %)Concept(%%), which is not maintainable and belongs to the ConceptScheme maintainable class, the maintainedobject-id is the name of the ConceptScheme (conceptScheme-id) which the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belongs to;
++* if the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], which is not maintainable and belongs to the ConceptScheme maintainable class, the maintainedobject-id is the name of the ConceptScheme (conceptScheme-id) which the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belongs to;
  * if the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]], which is a maintainable class, the maintainedobject-id is the [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] name ([[codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]]-id).
--The maintainedobject-(% style="color:#e74c3c" %)version(%%) is the (% style="color:#e74c3c" %)version(%%), according to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] versioning rules, of the maintained object which the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belongs to (for example, possible (% style="color:#e74c3c" %)versions(%%) might be 1.0, 2.3, 1.0.0, 2.1.0 or 3.1.2).
++The maintainedobject-version is the [[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]], according to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] versioning rules, of the maintained object which the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belongs to (for example, possible (% style="color:#e74c3c" %)versions(%%) might be 1.0, 2.3, 1.0.0, 2.1.0 or 3.1.2).
  The container-object-id does not apply to the classes that can be referenced in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformations, therefore is not present in their URN.
@@ -76,11 +76,11 @@
  The object-id is the name of the non-[[maintainable artefact>>doc:sdmx:Glossary 2\.1.Maintainable artefact.WebHome]] (when the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is maintainable its name is already specified as the maintainedobject-id, see above), in particular it has to be specified:
  * if the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension, [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] or DataAttribute (the object-id is the name of one of the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] above, which are data structure [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]])
--* if the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a (% style="color:#e74c3c" %)Concept(%%) (the object-id is the name of the (% style="color:#e74c3c" %)Concept(%%))
++* if the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]] (the object-id is the name of the [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]])
--For example, by using the URN, the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformation that sums two [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] DF1 and DF2 and assigns the result to a third persistent [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] DFR, assuming that DF1, DF2 and DFR are the maintainedobject-id of the three [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], that their (% style="color:#e74c3c" %)version(%%) is 1.0.0 and their Agency is AG, would be written as
++For example, by using the URN, the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformation that sums two [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] DF1 and DF2 and assigns the result to a third persistent [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] DFR, assuming that DF1, DF2 and DFR are the maintainedobject-id of the three [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], that their [[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]] is 1.0.0 and their Agency is AG, would be written as
  {{footnote}}Since these references to SDMX objects include non-permitted characters as per the VTL ID notation, they need to be included between single quotes, according to the VTL rules for irregular names.{{/footnote}}:
@@ -97,21 +97,19 @@
  * The SDMXprefix can be omitted for all the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] objects, because it is a prefixed string (urn:[[sdmx>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]:org), always the same for [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] objects.
  * The [[SDMX-IM>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]-package-name** **can be omitted as well because it can be deduced from the class-name that follows it (the table of the [[SDMX-IM>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]] packages and classes that allows this deduction is in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 Standards - Section 5 - Registry Specifications, paragraph 6.2.3). In particular, considering the object classes of the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] that [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] can reference, the package is:
  ** "datastructure" for the classes [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension, [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], DataAttribute,
--** "conceptscheme" for the class (% style="color:#e74c3c" %)Concept(%%),
++** "conceptscheme" for the class [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]],
  ** "[[codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]]" for the class [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]].
--* The class-name can be omitted as it can be deduced from the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] invocation. In particular, starting from the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] class of the invoked [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] (e.g. [[dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], [[component>>doc:sdmx:Glossary 2\.1.Component.WebHome]], identifier, [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]], [[variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]], valuedomain), which is known given the syntax of the invoking [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] operator{{footnote}}For the syntax of the VTL operators see the VTL Reference Manual{{/footnote}}, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] class can be deduced from the (% style="color:#e74c3c" %)mapping(%%) rules between [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] (see the section "(% style="color:#e74c3c" %)Mapping(%%) between [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]" hereinafter){{footnote}}In case the invoked artefact is a VTL component, which can be invoked only within the invocation of a VTL data set (SDMX Dataflow), the specific SDMX class-name (e.g. Dimension, TimeDimension, Measure or DataAttribute) can be deduced from the data structure of the SDMX Dataflow, which the component belongs to.{{/footnote}}.
++* The class-name can be omitted as it can be deduced from the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] invocation. In particular, starting from the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] class of the invoked [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] (e.g. [[dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], [[component>>doc:sdmx:Glossary 2\.1.Component.WebHome]], identifier, [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]], [[variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]], valuedomain), which is known given the syntax of the invoking [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] operator{{footnote}}For the syntax of the VTL operators see the VTL Reference Manual{{/footnote}}, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] class can be deduced from the mapping rules between [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] (see the section "Mapping between [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]" hereinafter){{footnote}}In case the invoked artefact is a VTL component, which can be invoked only within the invocation of a VTL data set (SDMX Dataflow), the specific SDMX class-name (e.g. Dimension, TimeDimension, Measure or DataAttribute) can be deduced from the data structure of the SDMX Dataflow, which the component belongs to.{{/footnote}}.
  * If the agency-id is not specified, it is assumed by default equal to the agency-id of the TransformationScheme, UserDefinedOperatorScheme or RulesetScheme from which the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is invoked. For example, the agencyid can be omitted if it is the same as the invoking TransformationScheme and cannot be omitted if the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] comes from another agency{{footnote}}If the Agency is composite (for example AgencyA.Dept1.Unit2), the agency is considered different even if only part of the composite name is different (for example AgencyA.Dept1.Unit3 is a different Agency than the previous one). Moreover the agency-id cannot be omitted in part (i.e., if a TransformationScheme owned by AgencyA.Dept1.Unit2 references an artefact coming from AgencyA.Dept1.Unit3, the specification of the agency-id becomes mandatory and must be complete, without omitting the possibly equal parts like AgencyA.Dept1){{/footnote}}. Take also into account that, according to the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] consistency rules, the agency of the result of a Transformation must be the same as its TransformationScheme, therefore the agency-id can be omitted for all the results (left part of Transformation statements).
  * As for the maintainedobject-id, this is essential in some cases while in other cases it can be omitted:
  ** if the referenced [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], which is a maintainable class, the maintainedobject-id is the [[dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]]-id and obviously cannot be omitted;
  ** if the referenced [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension, [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], DataAttribute, which are not maintainable and belong to the DataStructure maintainable class, the maintainedobject-id is the dataStructure-id and can be omitted, given that these [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] are always invoked within the invocation of a [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], whose dataStructure-id can be deduced from the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structural definitions;
--** if the referenced [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a (% style="color:#e74c3c" %)Concept(%%), which is not maintainable and belong to the ConceptScheme maintainable class, the maintained object is the conceptScheme-id and cannot be omitted;
++** if the referenced [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], which is not maintainable and belong to the ConceptScheme maintainable class, the maintained object is the conceptScheme-id and cannot be omitted;
  ** if the referenced [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] is a [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]], which is a maintainable class, the maintainedobject-id is the [[codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]]-id and obviously cannot be omitted.
--* When the maintainedobject-id is omitted, the maintainedobject-(% style="color:#e74c3c" %)version(%%) is omitted too. When the maintainedobject-id is not omitted and the maintainedobject-(% style="color:#e74c3c" %)version(%%) is omitted, the (% style="color:#e74c3c" %)version(%%) 1.0 is assumed by default.
++* When the maintainedobject-id is omitted, the maintainedobject-[[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]] is omitted too. When the maintainedobject-id is not omitted and the maintainedobject-[[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]] is omitted, the [[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]] 1.0 is assumed by default.
  * As said, the container-object-id does not apply to the classes that can be referenced in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformations, therefore is not present in their URN
--* The object-id does not exist for the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belonging to the [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], and [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] classes, while it exists and cannot be omitted for the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belonging to the classes [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension, [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], DataAttribute and (% style="color:#e74c3c" %)Concept(%%), as for them the object-id is the main identifier of the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]
++* The object-id does not exist for the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belonging to the [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], and [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] classes, while it exists and cannot be omitted for the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] belonging to the classes [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension, [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], DataAttribute and [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], as for them the object-id is the main identifier of the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]
--
--
  The simplified object identifier is obtained by omitting all the first part of the URN, including the special characters, till the first part not omitted.
  For example, the full formulation that uses the complete URN shown at the end of the previous paragraph:
@@ -144,9 +144,9 @@
  > 'DFR(1.0.0)' := 'DF1(1.0.0)' [rename SECTOR to SEC]
--In the references to the (% style="color:#e74c3c" %)Concepts(%%), which can exist for example in the definition of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Rulesets, at least the conceptScheme-id and the (% style="color:#e74c3c" %)concept(%%)-id must be specified.
++In the references to the [[Concepts>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], which can exist for example in the definition of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Rulesets, at least the conceptScheme-id and the [[concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]]-id must be specified.
--An example of non-abbreviated reference, if the conceptScheme-id is CS1 and the (% style="color:#e74c3c" %)concept(%%)-id is [[SECTOR>>doc:sdmx:Glossary 2\.1.Sector.WebHome]], is the following:
++An example of non-abbreviated reference, if the conceptScheme-id is CS1 and the [[concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]]-id is [[SECTOR>>doc:sdmx:Glossary 2\.1.Sector.WebHome]], is the following:
  > 'urn:sdmx:org.sdmx.infomodel.conceptscheme.Concept=AG:CS1(1.0.0).SECTOR'
@@ -158,7 +158,7 @@
  > 'DFR(1.0.0)' := between ( 'DF1(1.0.0)', 0, 25000 )
--The [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] ([[Component>>doc:sdmx:Glossary 2\.1.Component.WebHome]], (% style="color:#e74c3c" %)Concept(%%), [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] …) which the Values are referred to can be deduced from the context in which the reference is made, taking also into account the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] syntax. In the Transformation above, for example, the values 0 and 2500 are compared to the values of the [[measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] of DF1(1.0.0).
++The [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] ([[Component>>doc:sdmx:Glossary 2\.1.Component.WebHome]], [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] …) which the Values are referred to can be deduced from the context in which the reference is made, taking also into account the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] syntax. In the Transformation above, for example, the values 0 and 2500 are compared to the values of the [[measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] of DF1(1.0.0).
  === 12.2.4 User-defined alias ===
@@ -172,29 +172,29 @@
  The [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Rulesets have a signature, in which the Value Domains or the [[Variables>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]] on which the Ruleset is defined are declared, and a body, which contains the Rules.
--In the signature, given the (% style="color:#e74c3c" %)mapping(%%) between [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] better described in the following paragraphs, a reference to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Value Domain becomes a reference to a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]], while a reference to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Represented [[Variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]] becomes a reference to a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)Concept(%%), assuming for it a definite [[representation>>doc:sdmx:Glossary 2\.1.Representation.WebHome]]{{footnote}}Rulesets of this kind cannot be reused when the referenced Concept has a different representation.{{/footnote}}.
++In the signature, given the mapping between [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] better described in the following paragraphs, a reference to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Value Domain becomes a reference to a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]], while a reference to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Represented [[Variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]] becomes a reference to a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], assuming for it a definite [[representation>>doc:sdmx:Glossary 2\.1.Representation.WebHome]]{{footnote}}Rulesets of this kind cannot be reused when the referenced Concept has a different representation.{{/footnote}}.
--In general, for referencing [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Codelists>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] and (% style="color:#e74c3c" %)Concepts(%%), the conventions described in the previous paragraphs apply. In the Ruleset syntax, the elements that reference [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] are called "valueDomain" and "[[variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]]" for the Datapoint Rulesets and "ruleValueDomain", "ruleVariable", "condValueDomain" "condVariable" for the Hierarchical Rulesets).
++In general, for referencing [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Codelists>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] and [[Concepts>>doc:sdmx:Glossary 2\.1.Concept.WebHome]], the conventions described in the previous paragraphs apply. In the Ruleset syntax, the elements that reference [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] are called "valueDomain" and "[[variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]]" for the Datapoint Rulesets and "ruleValueDomain", "ruleVariable", "condValueDomain" "condVariable" for the Hierarchical Rulesets).
--The syntax of the Ruleset signature allows also to define aliases of the elements above, these aliases are valid only within the specific Ruleset definition statement and cannot be (% style="color:#e74c3c" %)mapped(%%) to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]].{{footnote}}See also the section "VTL-DL Rulesets" in the VTL Reference Manual.{{/footnote}}
++The syntax of the Ruleset signature allows also to define aliases of the elements above, these aliases are valid only within the specific Ruleset definition statement and cannot be mapped to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]].{{footnote}}See also the section "VTL-DL Rulesets" in the VTL Reference Manual.{{/footnote}}
--In the body of the Rulesets, the [[Codes>>doc:sdmx:Glossary 2\.1.Code.WebHome]] and in general all the Values can be written without any other specification, because the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]], which the Values are referred ([[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]], (% style="color:#e74c3c" %)Concept(%%)) to can be deduced from the Ruleset signature.
++In the body of the Rulesets, the [[Codes>>doc:sdmx:Glossary 2\.1.Code.WebHome]] and in general all the Values can be written without any other specification, because the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]], which the Values are referred ([[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]], [[Concept>>doc:sdmx:Glossary 2\.1.Concept.WebHome]]) to can be deduced from the Ruleset signature.
  == 12.3 Mapping between SDMX and VTL artefacts ==
  === 12.3.1. When the mapping occurs ===
--The (% style="color:#e74c3c" %)mapping(%%) methods between the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object classes allow transforming a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition in a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] one and vice-versa for the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] to be manipulated. It should be remembered that [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] programs (i.e. Transformation Schemes) are represented in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] through the TransformationScheme maintainable class which is composed of Transformations ([[nameable artefacts>>doc:sdmx:Glossary 2\.1.Nameable artefact.WebHome]]). Each Transformation assigns the outcome of the evaluation of a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] expression to a result: the input operands of the expression and the result can be [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]. Every time a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object is referenced in a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformation as an input operand, there is the need to generate a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] definition of the object, so that the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] operations can take place. This can be made starting from the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition and applying a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-[[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (% style="color:#e74c3c" %)mapping(%%) method in the direction from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]. The possible (% style="color:#e74c3c" %)mapping(%%) methods from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] are described in the following paragraphs and are conceived to allow the automatic deduction of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] definition of the object from the knowledge of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition.
++The mapping methods between the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object classes allow transforming a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition in a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] one and vice-versa for the [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] to be manipulated. It should be remembered that [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] programs (i.e. Transformation Schemes) are represented in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] through the TransformationScheme maintainable class which is composed of Transformations ([[nameable artefacts>>doc:sdmx:Glossary 2\.1.Nameable artefact.WebHome]]). Each Transformation assigns the outcome of the evaluation of a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] expression to a result: the input operands of the expression and the result can be [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]. Every time a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object is referenced in a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformation as an input operand, there is the need to generate a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] definition of the object, so that the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] operations can take place. This can be made starting from the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition and applying a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]-[[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] mapping method in the direction from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]. The possible mapping methods from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] are described in the following paragraphs and are conceived to allow the automatic deduction of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] definition of the object from the knowledge of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition.
  In the opposite direction, every time an object calculated by means of [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] must be treated as a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] object (for example for exchanging it through [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]), there is the need of a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition of the object, so that the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] operations can take place. The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition is needed for the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] objects for which a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] use is envisaged{{footnote}}If a calculated artefact is persistent, it needs a persistent definition, i.e. a SDMX definition in a SDMX environment. In addition, possible calculated artefact that are not persistent may require a SDMX definition, for example when the result of a nonpersistent calculation is disseminated through SDMX tools (like an inquiry tool).{{/footnote}}.
--The (% style="color:#e74c3c" %)mapping(%%) methods from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] are described in the following paragraphs as well, however they do not allow the complete [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition to be automatically deduced from the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] definition, more than all because the former typically contains additional information in respect to the latter. For example, the definition of a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] includes also some mandatory information not available in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (like the [[concept scheme>>doc:sdmx:Glossary 2\.1.Concept scheme.WebHome]] to which the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] refer, the ‘usage’ and ‘attributeRelationship’ for the DataAttributes and so on). Therefore the (% style="color:#e74c3c" %)mapping(%%) methods from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] provide only a general guidance for generating [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definitions properly starting from the information available in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]], independently of how the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition it is actually generated (manually, automatically or part and part).
++The mapping methods from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] are described in the following paragraphs as well, however they do not allow the complete [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition to be automatically deduced from the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] definition, more than all because the former typically contains additional information in respect to the latter. For example, the definition of a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] includes also some mandatory information not available in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (like the [[concept scheme>>doc:sdmx:Glossary 2\.1.Concept scheme.WebHome]] to which the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] refer, the ‘usage’ and ‘attributeRelationship’ for the DataAttributes and so on). Therefore the mapping methods from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] provide only a general guidance for generating [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definitions properly starting from the information available in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]], independently of how the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definition it is actually generated (manually, automatically or part and part).
  === 12.3.2 General mapping of VTL and SDMX data structures ===
  This section makes reference to the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] "Model for data and their structure"{{footnote}}See the VTL 2.0 User Manual{{/footnote}} and the correspondent [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] "[[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]]"{{footnote}}See the SDMX Standards Section 2 – Information Model{{/footnote}}.
--The main type of [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] that the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] can manipulate is the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Data Set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], which in general is (% style="color:#e74c3c" %)mapped(%%) to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]]. This means that a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformation, in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] context, expresses the algorithm for calculating a derived [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] starting from some already existing [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] (either collected or derived).{{footnote}}Besides the mapping between one SDMX Dataflow and one VTL Data Set, it is also possible to map distinct parts of a SDMX Dataflow to different VTL Data Set, as explained in a following paragraph.{{/footnote}}
++The main type of [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] that the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] can manipulate is the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Data Set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], which in general is mapped to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]]. This means that a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformation, in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] context, expresses the algorithm for calculating a derived [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] starting from some already existing [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] (either collected or derived).{{footnote}}Besides the mapping between one SDMX Dataflow and one VTL Data Set, it is also possible to map distinct parts of a SDMX Dataflow to different VTL Data Set, as explained in a following paragraph.{{/footnote}}
  While the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformations are defined in term of [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] definitions, they are assumed to be executed on instances of such [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], provided at runtime to the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] engine (the mechanism for identifying the instances to be processed are not part of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] specifications and depend on the implementation of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]-based systems). As already said, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Datasets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] are instances of [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]], therefore a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Transformation defined on some [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] can be applied on some corresponding [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Datasets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]].
@@ -204,18 +204,18 @@
  Correspondingly, in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] implementation of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]], the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Identifiers can be (optionally) distinguished in similar sub-classes (Simple Identifier, Time Identifier) even if such a distinction is not evidenced in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] IM.
--The possible (% style="color:#e74c3c" %)mapping(%%) options are described in more detail in the following sections.
++The possible mapping options are described in more detail in the following sections.
  === 12.3.3 Mapping from SDMX to VTL data structures ===
  ==== 12.3.3.1 Basic Mapping ====
--The main (% style="color:#e74c3c" %)mapping(%%) method from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] is called **Basic **(% style="color:#e74c3c" %)mapping(%%). This is considered as the default (% style="color:#e74c3c" %)mapping(%%) method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes.
++The main mapping method from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] is called **Basic **mapping. This is considered as the default mapping method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes.
  When transforming **from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]**, this method consists in leaving the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] unchanged and maintaining their names and roles, according to the following table:
  (% style="width:468.294px" %)
--|(% style="width:196px" %)**[[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]**|(% style="width:269px" %)**[[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]**
++|(% style="width:196px" %)**SDMX**|(% style="width:269px" %)**VTL**
  |(% style="width:196px" %)[[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]]|(% style="width:269px" %)(Simple) Identifier
  |(% style="width:196px" %)TimeDimension|(% style="width:269px" %)(Time) Identifier
  |(% style="width:196px" %)[[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]|(% style="width:269px" %)[[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]
@@ -223,33 +223,33 @@
  The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttributes, in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] they are all considered "at data point / observation (% style="color:#e74c3c" %)level(%%)" (i.e. dependent on all the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Identifiers), because [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] does not have the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] AttributeRelationships, which defines the construct to which the DataAttribute is related (e.g. observation, [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] or set or group of [[dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], whole [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]).
--With the Basic (% style="color:#e74c3c" %)mapping(%%), one [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] observation^^27^^ generates one [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data point.
++With the Basic mapping, one [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] observation^^27^^ generates one [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data point.
  ==== 12.3.3.2 Pivot Mapping ====
--An alternative (% style="color:#e74c3c" %)mapping(%%) method from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] is the **Pivot **(% style="color:#e74c3c" %)mapping(%%), which makes sense and is different from the Basic method only for the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data structures that contain a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] that plays the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] (like in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1) and just one [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]. Through this method, these structures can be (% style="color:#e74c3c" %)mapped(%%) to multimeasure [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data structures. Besides that, a user may choose to use any [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] acting as a list of [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] (e.g., a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] with [[indicators>>doc:sdmx:Glossary 2\.1.Statistical indicator.WebHome]]), either by considering the “[[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]” role of a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], or at will using any coded [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]]. Of course, in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 3.0, this can only work when only one [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] is defined in the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++An alternative mapping method from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] is the **Pivot **mapping, which makes sense and is different from the Basic method only for the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data structures that contain a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] that plays the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] (like in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1) and just one [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]. Through this method, these structures can be mapped to multimeasure [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data structures. Besides that, a user may choose to use any [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] acting as a list of [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] (e.g., a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] with [[indicators>>doc:sdmx:Glossary 2\.1.Statistical indicator.WebHome]]), either by considering the “[[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]” role of a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], or at will using any coded [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]]. Of course, in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 3.0, this can only work when only one [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] is defined in the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
--In [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 the MeasureDimension was a subclass of DimensionComponent like [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] and TimeDimension. In the current [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)version(%%), this subclass does not exist anymore, however a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] can have the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] (i.e. a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] that contributes to the identification of the [[measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]). In [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 a DataStructure could have zero or one MeasureDimensions, in the current (% style="color:#e74c3c" %)version(%%) of the standard, from zero to many [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] may have the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]]. Hereinafter a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] that plays the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] is referenced for simplicity as “MeasureDimension“, i.e. maintaining the capital letters and the courier font even if the MeasureDimension is not anymore a class in the [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]] of the current [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)version(%%). For the sake of simplicity, the description below considers just one [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] having the role of MeasureDimension (i.e., the more simple and common case). Nevertheless, it maintains its validity also if in the DataStructure there are more [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] with the role of MeasureDimensions: in this case what is said about the MeasureDimension must be applied to the combination of all the MeasureDimensions considered as a joint [[variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]]{{footnote}}E.g., if in the data structure there exist 3 Dimensions C,D,E having the role of MeasureDimension, they should be considered as a joint MeasureDimension Z=(C,D,E); therefore when the description says “each possible value Cj of the MeasureDimension …” it means “each possible combination of values (Cj, Dk, Ew) of the joint MeasureDimension Z=(C,D,E)”.{{/footnote}}.
++In [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 the MeasureDimension was a subclass of DimensionComponent like [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] and TimeDimension. In the current [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] version, this subclass does not exist anymore, however a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] can have the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] (i.e. a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] that contributes to the identification of the [[measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]). In [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 a DataStructure could have zero or one MeasureDimensions, in the current version of the standard, from zero to many [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] may have the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]]. Hereinafter a [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] that plays the role of [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] is referenced for simplicity as “MeasureDimension“, i.e. maintaining the capital letters and the courier font even if the MeasureDimension is not anymore a class in the [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]] of the current [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] version. For the sake of simplicity, the description below considers just one [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] having the role of MeasureDimension (i.e., the more simple and common case). Nevertheless, it maintains its validity also if in the DataStructure there are more [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] with the role of MeasureDimensions: in this case what is said about the MeasureDimension must be applied to the combination of all the MeasureDimensions considered as a joint [[variable>>doc:sdmx:Glossary 2\.1.Statistical variable.WebHome]]{{footnote}}E.g., if in the data structure there exist 3 Dimensions C,D,E having the role of MeasureDimension, they should be considered as a joint MeasureDimension Z=(C,D,E); therefore when the description says “each possible value Cj of the MeasureDimension …” it means “each possible combination of values (Cj, Dk, Ew) of the joint MeasureDimension Z=(C,D,E)”.{{/footnote}}.
  Among other things, the Pivot method provides also backward compatibility with the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 data structures that contained a MeasureDimension.
--If applied to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structures that do not contain any MeasureDimension, this method behaves like the Basic (% style="color:#e74c3c" %)mapping(%%) (see the previous paragraph).
++If applied to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structures that do not contain any MeasureDimension, this method behaves like the Basic mapping (see the previous paragraph).
--The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structures that contain a MeasureDimension are (% style="color:#e74c3c" %)mapped(%%) as described below (this (% style="color:#e74c3c" %)mapping(%%) is equivalent to a pivoting operation):
++The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structures that contain a MeasureDimension are mapped as described below (this mapping is equivalent to a pivoting operation):
  * A [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] simple [[dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] becomes a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (simple) identifier and a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] TimeDimension becomes a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (time) identifier;
--* Each possible [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] Cj of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension is (% style="color:#e74c3c" %)mapped(%%) to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], having the same name as the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] (i.e. Cj); the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] Cj is a new [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[component>>doc:sdmx:Glossary 2\.1.Component.WebHome]] even if the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data structure has not such a [[Component>>doc:sdmx:Glossary 2\.1.Component.WebHome]];
--* The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension is not (% style="color:#e74c3c" %)mapped(%%) to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (it disappears in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Data Structure);
--* The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] is not (% style="color:#e74c3c" %)mapped(%%) to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] as well (it disappears in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Data Structure);
--* An [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute is (% style="color:#e74c3c" %)mapped(%%) in different ways according to its AttributeRelationship:
--** If, according to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] AttributeRelationship, the values of the DataAttribute do not depend on the values of the MeasureDimension, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute becomes a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] having the same name. This happens if the AttributeRelationship is not specified (i.e. the DataAttribute does not depend on any DimensionComponent and therefore is at [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] (% style="color:#e74c3c" %)level(%%)), or if it refers to a set (or a group) of [[dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] which does not include the MeasureDimension;
--** Otherwise, if, according to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] AttributeRelationship, the values of the DataAttribute depend on the MeasureDimension, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute is (% style="color:#e74c3c" %)mapped(%%) to one [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] for each possible [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension. By default, the names of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] are obtained by concatenating the name of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute and the names of the correspondent [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the MeasureDimension separated by underscore. For example, if the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute is named DA and the possible [[Codes>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension are named C1, C2, …, Cn, then the corresponding [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] will be named DA_C1, DA_C2, …, DA_Cn (if different names are desired, they can be achieved afterwards by renaming the [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] through [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] operators).
--** Like in the Basic (% style="color:#e74c3c" %)mapping(%%), the resulting [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] are considered as dependent on all the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] identifiers (i.e. "at data point / observation (% style="color:#e74c3c" %)level(%%)"), because [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] does not have the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] notion of [[Attribute Relationship>>doc:sdmx:Glossary 2\.1.Attribute relationship.WebHome]].
++* Each possible [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] Cj of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension is mapped to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], having the same name as the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] (i.e. Cj); the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] Cj is a new [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[component>>doc:sdmx:Glossary 2\.1.Component.WebHome]] even if the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data structure has not such a [[Component>>doc:sdmx:Glossary 2\.1.Component.WebHome]];
++* The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension is not mapped to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (it disappears in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Data Structure);
++* The [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] is not mapped to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] as well (it disappears in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Data Structure);
++* An [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute is mapped in different ways according to its AttributeRelationship:
++** If, according to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] AttributeRelationship, the values of the DataAttribute do not depend on the values of the MeasureDimension, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute becomes a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] having the same name. This happens if the AttributeRelationship is not specified (i.e. the DataAttribute does not depend on any DimensionComponent and therefore is at [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] level), or if it refers to a set (or a group) of [[dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] which does not include the MeasureDimension;
++** Otherwise, if, according to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] AttributeRelationship, the values of the DataAttribute depend on the MeasureDimension, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute is mapped to one [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] for each possible [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension. By default, the names of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] are obtained by concatenating the name of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute and the names of the correspondent [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the MeasureDimension separated by underscore. For example, if the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttribute is named DA and the possible [[Codes>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension are named C1, C2, …, Cn, then the corresponding [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] will be named DA_C1, DA_C2, …, DA_Cn (if different names are desired, they can be achieved afterwards by renaming the [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] through [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] operators).
++** Like in the Basic mapping, the resulting [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] are considered as dependent on all the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] identifiers (i.e. "at data point / observation level"), because [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] does not have the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] notion of [[Attribute Relationship>>doc:sdmx:Glossary 2\.1.Attribute relationship.WebHome]].
--The summary (% style="color:#e74c3c" %)mapping(%%) table of the "pivot" (% style="color:#e74c3c" %)mapping(%%) from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] for the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data structures that contain a MeasureDimension is the following:
++The summary mapping table of the "pivot" mapping from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] for the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] data structures that contain a MeasureDimension is the following:
  (% style="width:739.294px" %)
--|(% style="width:335px" %)**[[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]**|(% style="width:400px" %)**[[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]**
++|(% style="width:335px" %)**SDMX**|(% style="width:400px" %)**VTL**
  |(% style="width:335px" %)[[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]]|(% style="width:400px" %)(Simple) Identifier
  |(% style="width:335px" %)TimeDimension|(% style="width:400px" %)(Time) Identifier
  |(% style="width:335px" %)MeasureDimension & one [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]|(% style="width:400px" %)One [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] for each [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension
@@ -259,9 +259,9 @@
  [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension
  )))
--Using this (% style="color:#e74c3c" %)mapping(%%) method, the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] of the data structure can change in the conversion from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and it must be taken into account that the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] statements can reference only the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] of the resulting [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data structure.
++Using this mapping method, the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] of the data structure can change in the conversion from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and it must be taken into account that the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] statements can reference only the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] of the resulting [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data structure.
--At observation / data point (% style="color:#e74c3c" %)level(%%), calling Cj (j=1, … n) the j^^th^^ [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the MeasureDimension:
++At observation / data point level, calling Cj (j=1, … n) the j^^th^^ [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] of the MeasureDimension:
  * The set of [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] observations having the same values for all the [[Dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] except than the MeasureDimension become one multi-[[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] Data Point, having one [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] for each [[Code>>doc:sdmx:Glossary 2\.1.Code.WebHome]] Cj of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] MeasureDimension;
  * The values of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] simple [[Dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]], TimeDimension and DataAttributes not depending on the MeasureDimension (these [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] by definition have always the same values for all the observations of the set above) become the values of the corresponding [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (simple) Identifiers, (time) Identifier and [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]].
@@ -274,22 +274,22 @@
  The Basic_A2M and Pivot_A2M behaves respectively like the Basic and Pivot methods, except that the final [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]], which according to the Basic and Pivot methods would have had the role of [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]], assume instead the role of [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]].
--Proper [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] features allow changing the role of specific [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] even after the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (% style="color:#e74c3c" %)mapping(%%): they can be useful when only some of the DataAttributes need to be managed as [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]].
++Proper [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] features allow changing the role of specific [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] even after the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] mapping: they can be useful when only some of the DataAttributes need to be managed as [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]].
  === 12.3.4 Mapping from VTL to SDMX data structures ===
  ==== 12.3.4.1 Basic Mapping ====
--The main (% style="color:#e74c3c" %)mapping(%%) method **from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]** is called **Basic **(% style="color:#e74c3c" %)mapping(%%) as well.
++The main mapping method **from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]** is called **Basic **mapping as well.
  This is considered as the default (% style="color:#e74c3c" %)mapping(%%) method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes.
--The method consists in leaving the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] unchanged and maintaining their names and roles in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]], according to the following (% style="color:#e74c3c" %)mapping(%%) table, which is the same as the basic (% style="color:#e74c3c" %)mapping(%%) from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]], only seen in the opposite direction.
++The method consists in leaving the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] unchanged and maintaining their names and roles in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]], according to the following mapping table, which is the same as the basic mapping from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]], only seen in the opposite direction.
--(% style="color:#e74c3c" %)Mapping(%%) table:
++Mapping table:
  (% style="width:470.294px" %)
--|(% style="width:262px" %)**[[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]]**|(% style="width:205px" %)**[[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]]**
++|(% style="width:262px" %)**VTL**|(% style="width:205px" %)**SDMX**
  |(% style="width:262px" %)(Simple) Identifier|(% style="width:205px" %)[[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]]
  |(% style="width:262px" %)(Time) Identifier|(% style="width:205px" %)TimeDimension
  |(% style="width:262px" %)[[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]|(% style="width:205px" %)[[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]]
@@ -297,21 +297,21 @@
  If the distinction between simple identifier and time identifier is not maintained in the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] environment, the [[classification>>doc:sdmx:Glossary 2\.1.Statistical Classification.WebHome]] between [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] and TimeDimension exists only in [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]], as declared in the relevant DataStructureDefinition.
--Regarding the [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]], because [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] considers all of them "at observation (% style="color:#e74c3c" %)level(%%)", the corresponding [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttributes should be put "at observation (% style="color:#e74c3c" %)level(%%)" as well, unless some different information about their AttributeRelationship is otherwise available.
++Regarding the [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]], because [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] considers all of them "at observation level", the corresponding [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataAttributes should be put "at observation level" as well, unless some different information about their AttributeRelationship is otherwise available.
--Note that the basic mappings in the two directions (from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and vice-versa) are (almost completely) reversible. In fact, if a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structure is (% style="color:#e74c3c" %)mapped(%%) to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structure and then the latter is (% style="color:#e74c3c" %)mapped(%%) back to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]], the resulting data structure is like the original one (apart for the AttributeRelationship, that can be different if the original [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structure contains DataAttributes that are not at observation (% style="color:#e74c3c" %)level(%%)). In reverse order, if a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structure is (% style="color:#e74c3c" %)mapped(%%) to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] and then the latter is (% style="color:#e74c3c" %)mapped(%%) back to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]], the original data structure is obtained.
++Note that the basic mappings in the two directions (from [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] and vice-versa) are (almost completely) reversible. In fact, if a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structure is mapped to a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structure and then the latter is mapped back to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]], the resulting data structure is like the original one (apart for the AttributeRelationship, that can be different if the original [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] structure contains DataAttributes that are not at observation level). In reverse order, if a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structure is mapped to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] and then the latter is mapped back to [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]], the original data structure is obtained.
  As said, the resulting [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] definitions must be compliant with the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] consistency rules. For example, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] must have the AttributeRelationship for the DataAttributes, which does not exist in [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]].
  ==== 12.3.4.2 Unpivot Mapping ====
--An alternative (% style="color:#e74c3c" %)mapping(%%) method from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] is the **Unpivot **(% style="color:#e74c3c" %)mapping(%%).
++An alternative mapping method from [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] is the **Unpivot **mapping.
--Although this (% style="color:#e74c3c" %)mapping(%%) method can be used in any case, it makes major sense in case the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data structure has more than one [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[component>>doc:sdmx:Glossary 2\.1.Component.WebHome]] (multi-[[measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structure). This is used to support the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 case of a MeasureDimension or any other [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] acting as a list of [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], under the assumptions explained in section “Pivot (% style="color:#e74c3c" %)Mapping(%%)”.
++Although this mapping method can be used in any case, it makes major sense in case the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] data structure has more than one [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[component>>doc:sdmx:Glossary 2\.1.Component.WebHome]] (multi-[[measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structure). This is used to support the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 2.1 case of a MeasureDimension or any other [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] acting as a list of [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], under the assumptions explained in section “Pivot Mapping”.
  The multi-[[measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structures are converted to [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dataflows>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] having an added MeasureDimension, which disambiguates the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] multiple [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]], and a new [[Measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] in place of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] ones, containing the values of the [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] [[Measures>>doc:sdmx:Glossary 2\.1.Measure.WebHome]].
--The **unpivot** (% style="color:#e74c3c" %)mapping(%%) behaves like follows:
++The **unpivot** mapping behaves like follows:
  * like in the basic (% style="color:#e74c3c" %)mapping(%%), a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (simple) identifier becomes a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] and a [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] (time) identifier becomes a [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] TimeDimension (as said, a [[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] identifier cannot exist in multi-[[measure>>doc:sdmx:Glossary 2\.1.Measure.WebHome]] [[VTL>>doc:sdmx:Glossary 2\.1.Validation and transformation language.WebHome]] structures);
  * a MeasureDimension [[component>>doc:sdmx:Glossary 2\.1.Component.WebHome]] called "measure_name" is added to the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] DataStructure;