Changes for page 5 Data Structure Definition and Dataset

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  == 5.1 Introduction ==
--The DataStructureDefiniton is the class name for a structure definition for data. Some organisations know this type of definition as a “Key Family” and so the two names are synonymous. The term [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]] (also referred to as [[DSD>>doc:Glossary.Data structure definition.WebHome]]) is used in this specification.
++The DataStructureDefiniton is the class [[name>>doc:IMElements.name.WebHome]] for a [[structure>>doc:IMElements.structure.WebHome]] definition for data. Some organisations know this [[type>>doc:IMElements.type.WebHome]] of definition as a “[[Key>>doc:IMElements.AnnotableArtefact.Key.WebHome]] Family” and so the two names are synonymous. The term [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] (also referred to as [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]]) is used in this specification.
--Many of the constructs in this layer of the model inherit from the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Base Layer. Therefore, it is necessary to study both the inheritance and the relationship diagrams to understand the functionality of individual packages. In simple sub models these are shown in the same diagram but are omitted from the more complex sub models for the sake of clarity. In these cases, the inheritance diagram below shows the full inheritance tree for the classes concerned with data structure definitions.
++Many of the constructs in this layer of the model inherit from the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base Layer. Therefore, it is necessary to study both the inheritance and the relationship diagrams to understand the functionality of individual packages. In simple sub models these are shown in the same diagram but are omitted from the more complex sub models for the sake of clarity. In these cases, the inheritance diagram below shows the full inheritance tree for the classes concerned with [[data structure definitions>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
--There are very few additional classes in this sub model other than those shown in the inheritance diagram below. In other words, the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Base gives most of the structure of this sub model both in terms of associations and in terms of [[attributes>>doc:Glossary.Attribute.WebHome]]. The relationship diagrams shown in this section show clearly when these associations are inherited from the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Base (see the Appendix “A Short Guide to UML in the [[SDMX Information Model>>doc:Glossary.SDMX Information Model.WebHome]]” to see the diagrammatic notation used to depict this).
++There are very few additional classes in this sub model other than those shown in the inheritance diagram below. In other words, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base gives most of the [[structure>>doc:IMElements.structure.WebHome]] of this sub model both in terms of associations and in terms of [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]]. The relationship diagrams shown in this section show clearly when these associations are inherited from the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base (see the Appendix “A Short Guide to UML in the [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]” to see the diagrammatic notation used to depict this).
--The actual [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Base construct from which the concrete classes inherit depends upon the requirements of the class for:
++The actual [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base construct from which the concrete classes inherit depends upon the requirements of the class for:
--[[Annotation>>doc:Glossary.Annotation.WebHome]] – //AnnotableArtefact//
--Identification – //IdentifiableArtefact//
--Naming – //NameableArtefact//
--Versioning – //VersionableArtefact//
--Maintenance – //MaintainableArtefact//
++[[Annotation>>doc:IMElements.Annotation.WebHome]] – //[[AnnotableArtefact>>doc:IMElements.AnnotableArtefact.WebHome]]//
++Identification – //[[IdentifiableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.WebHome]]//
++Naming – //[[NameableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.WebHome]]//
++Versioning – //[[VersionableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.WebHome]]//
++Maintenance – //[[MaintainableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.WebHome]]//
  == 5.2 Inheritance View ==
@@ -30,59 +30,59 @@
  ==== 5.2.2.1 Narrative ====
--Those classes in the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:Glossary.Annotation.WebHome]] inherit from //AnnotableArtefact//. These are:
++Those classes in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] metamodel which require annotations inherit from //[[AnnotableArtefact>>doc:IMElements.AnnotableArtefact.WebHome]]//. These are:
--//IdentifiableArtefact
--[[DataSet>>doc:Glossary.Data set.WebHome]]
--Key// (and therefore //SeriesKey// and //GroupKey//)
--//Observation//
++//[[IdentifiableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.WebHome]]
++[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]
++[[Key>>doc:IMElements.AnnotableArtefact.Key.WebHome]]// (and therefore //[[SeriesKey>>doc:IMElements.AnnotableArtefact.Key.SeriesKey.WebHome]]// and //[[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]]//)
++//[[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]]//
--Those classes in the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:Glossary.Annotation.WebHome]] and global identity are derived from //IdentifiableArtefact//. These are:
++Those classes in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] metamodel which require annotations and global identity are derived from //[[IdentifiableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.WebHome]]//. These are:
--//NameableArtefact
--ComponentList
--[[Component>>doc:Glossary.Component.WebHome]]//
++//[[NameableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.WebHome]]
++[[ComponentList>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.WebHome]]
++[[Component>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.WebHome]]//
--Those classes in the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:Glossary.Annotation.WebHome]], global identity, multilingual name and multilingual description are derived from //NameableArtefact//. These are:
++Those classes in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] metamodel which require annotations, global identity, multilingual [[name>>doc:IMElements.name.WebHome]] and multilingual [[description>>doc:IMElements.description.WebHome]] are derived from //[[NameableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.WebHome]]//. These are:
--//VersionableArtefact
--Item//
++//[[VersionableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.WebHome]]
++[[Item>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.WebHome]]//
--The classes in the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:Glossary.Annotation.WebHome]], global identity, multilingual name and multilingual description, and versioning are derived from //VersionableArtefact//. These are:
++The classes in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] metamodel which require annotations, global identity, multilingual [[name>>doc:IMElements.name.WebHome]] and multilingual [[description>>doc:IMElements.description.WebHome]], and versioning are derived from //[[VersionableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.WebHome]]//. These are:
--//MaintainableArtefact//
++//[[MaintainableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.WebHome]]//
--Abstract classes which represent information that is maintained by [[Maintenance Agencies>>doc:Glossary.Maintenance agency.WebHome]] all inherit from //MaintainableArtefact//, they also inherit all the features of a //VersionableArtefact//, and are:
++Abstract classes which represent information that is maintained by [[Maintenance Agencies>>doc:sdmx:Glossary 2\.1.Maintenance agency.WebHome]] all inherit from //[[MaintainableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.WebHome]]//, they also inherit all the features of a //[[VersionableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.WebHome]]//, and are:
--//StructureUsage
--Structure
--ItemScheme//
++//[[StructureUsage>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.WebHome]]
++[[Structure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.WebHome]]
++[[ItemScheme>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.ItemScheme.WebHome]]//
  All the above classes are abstract. The key to understanding the class diagrams presented in this section are the concrete classes that inherit from these abstract classes.
--Those concrete classes in the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]] and [[Dataset>>doc:Glossary.Data set.WebHome]] packages of the metamodel which require to be maintained by Agencies all inherit (via other abstract classes) from //MaintainableArtefact//, these are:
++Those concrete classes in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] and [[Dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] packages of the metamodel which require to be maintained by Agencies all inherit (via other abstract classes) from //[[MaintainableArtefact>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.WebHome]]//, these are:
--[[Dataflow>>doc:Glossary.Dataflow.WebHome]]
--DataStructureDefinition
--The [[component>>doc:Glossary.Component.WebHome]] structures that are lists of lists, inherit directly from //Structure//. A //Structure// contains several lists of [[components>>doc:Glossary.Component.WebHome]]. The concrete class that inherits from //Structure// is:
--DataStructureDefinition
++[[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]]
++[[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]
++The component structures that are lists of lists, inherit directly from //[[Structure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.WebHome]]//. A //[[Structure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.WebHome]]// contains several lists of [[components>>doc:IMElements.components.WebHome]]. The concrete class that inherits from //[[Structure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.WebHome]]// is:
++[[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]
--A DataStructureDefinition contains a list of [[dimensions>>doc:Glossary.Dimension.WebHome]], a list of [[measures>>doc:Glossary.Measure.WebHome]] and a list of [[attributes>>doc:Glossary.Attribute.WebHome]].
++A [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] contains a list of [[dimensions>>doc:IMElements.dimensions.WebHome]], a list of [[measures>>doc:IMElements.measures.WebHome]] and a list of [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]].
--The concrete classes which inherit from //ComponentList// and are subcomponents of the DataStructureDefinition are:
++The concrete classes which inherit from //[[ComponentList>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.WebHome]]// and are subcomponents of the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] are:
--DimensionDescriptor – content is [[Dimension>>doc:Glossary.Dimension.WebHome]] and TimeDimension
--DimensionGroupDescriptor – content is an association to [[Dimension>>doc:Glossary.Dimension.WebHome]], TimeDimension
--MeasureDescriptor – content is [[Measure>>doc:Glossary.Measure.WebHome]]
--AttributeDescriptor – content is DataAttribute and an association to MetadataAttribute
++[[DimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.DimensionDescriptor.WebHome]] – content is [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] and [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]]
++DimensionGroupDescriptor – content is an association to [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]], [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]]
++[[MeasureDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.MeasureDescriptor.WebHome]] – content is [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]]
++[[AttributeDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.AttributeDescriptor.WebHome]] – content is [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] and an association to [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]]
--The classes that inherit from //[[Component>>doc:Glossary.Component.WebHome]]// are:
++The classes that inherit from //[[Component>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.WebHome]]// are:
--[[Measure>>doc:Glossary.Measure.WebHome]]
--//DimensionComponent// and thereby its sub classes of [[Dimension>>doc:Glossary.Dimension.WebHome]] and TimeDimension
--//[[Attribute>>doc:Glossary.Attribute.WebHome]]// and thereby its sub classes of DataAttribute and MetadataAttribute
++[[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]]
++//[[DimensionComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.WebHome]]// and thereby its sub classes of [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] and [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]]
++//[[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]]// and thereby its sub classes of [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] and [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]]
--The concrete classes identified above are the majority of the classes required to define the metamodel for the DataStructureDefinition. The diagrams and explanations in the rest of this section show how these concrete classes are related in order to support the functionality required.
++The concrete classes identified above are the majority of the classes required to define the metamodel for the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]. The diagrams and explanations in the rest of this section show how these concrete classes are related in order to support the functionality required.
  == 5.3 Data Structure Definition – Relationship View ==
@@ -96,161 +96,161 @@
  ==== 5.3.2.1 Narrative ====
--A DataStructureDefinition defines the [[Dimensions>>doc:Glossary.Dimension.WebHome]], TimeDimension, DataAttributes, and [[Measures>>doc:Glossary.Measure.WebHome]], and associated [[Representations>>doc:Glossary.Representation.WebHome]], that comprise the valid structure of data and related [[attributes>>doc:Glossary.Attribute.WebHome]] that are contained in a [[DataSet>>doc:Glossary.Data set.WebHome]], which is defined by a [[Dataflow>>doc:Glossary.Dataflow.WebHome]]. In addition, a DataStructureDefinition may be related to one MetadataStructureDefinition, in order to use the latter’s MetadataAttributes, by relating them to other //[[Components>>doc:Glossary.Component.WebHome]]// within the [[DSD>>doc:Glossary.Data structure definition.WebHome]], as explained below.
++A [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] defines the Dimensions, [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]], DataAttributes, and Measures, and associated Representations, that comprise the valid [[structure>>doc:IMElements.structure.WebHome]] of data and related [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] that are contained in a [[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], which is defined by a [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]]. In addition, a [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] may be related to one [[MetadataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.MetadataStructureDefinition.WebHome]], in order to use the latter’s MetadataAttributes, by relating them to other //Components// within the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]], as explained below.
--The [[Dataflow>>doc:Glossary.Dataflow.WebHome]] may also have additional metadata attached that define qualitative information and (% style="color:#e74c3c" %)[[Constraints>>doc:Glossary.Constraint.WebHome]](%%) on the use of the DataStructureDefinition such as the subset of [[Codes>>doc:Glossary.Code.WebHome]] used in a [[Dimension>>doc:Glossary.Dimension.WebHome]] (this is covered later in this document – see sections “(% style="color:#e74c3c" %)[[Constraints>>doc:Glossary.Constraint.WebHome]](%%)” and “Data Provisioning”). Each [[Dataflow>>doc:Glossary.Dataflow.WebHome]] has a maximum of one DataStructureDefinition specified which defines the structure of any [[DataSets>>doc:Glossary.Data set.WebHome]] to be reported/disseminated. A [[Dataflow>>doc:Glossary.Dataflow.WebHome]] may optionally define which [[Dimensions>>doc:Glossary.Dimension.WebHome]] it uses, by defining a DimensionConstraint (this is a mandatory requirement if the DataStructureDefinition sets its’ evolvingStructure property to ‘true’ and is sematically referenced by the [[Dataflow>>doc:Glossary.Dataflow.WebHome]]).
++The [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]] may also have additional [[metadata>>doc:IMElements.metadata.WebHome]] attached that define qualitative information and [[Constraints>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]] on the use of the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] such as the subset of Codes used in a [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] (this is covered later in this document – see sections “[[Constraints>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]]” and “Data Provisioning”). Each [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]] has a maximum of one [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] specified which defines the [[structure>>doc:IMElements.structure.WebHome]] of any [[DataSets>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] to be reported/disseminated. A [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]] may optionally define which Dimensions it uses, by defining a [[DimensionConstraint>>doc:IMElements.DimensionConstraint.WebHome]] (this is a mandatory requirement if the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] sets its’ [[evolvingStructure>>doc:IMElements.evolvingStructure.WebHome]] property to ‘true’ and is sematically referenced by the [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]]).
--There are two types of [[dimensions>>doc:Glossary.Dimension.WebHome]] each having a common association to (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%):
++There are two types of [[dimensions>>doc:IMElements.dimensions.WebHome]] each having a common association to [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]]:
--* [[Dimension>>doc:Glossary.Dimension.WebHome]]
--* TimeDimension
++* [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]]
++* [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]]
--Note that DimensionComponent can be any or all its sub classes i.e., [[Dimension>>doc:Glossary.Dimension.WebHome]], TimeDimension.
++Note that [[DimensionComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.WebHome]] can be any or all its sub classes i.e., [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]], [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]].
--The //DimensionComponent//, DataAttribute, MetadataAttribute and [[Measure>>doc:Glossary.Measure.WebHome]] link to the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) that defines its name and semantic (/conceptIdentity association to (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%)). The DataAttribute, [[Dimension>>doc:Glossary.Dimension.WebHome]] (but not TimeDimension) and [[Measure>>doc:Glossary.Measure.WebHome]] can optionally have a +conceptRole association with a (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) that identifies its role in the DataStructureDefinition, or one of the standard pre-defined roles, i.e., those published in "GUIDELINES FOR [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] (% style="color:#e74c3c" %)[[CONCEPT>>doc:Glossary.Concept.WebHome]](%%) ROLES" by the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] SWG. The use of these roles is to enable applications to process the data in a meaningful way (e.g., relating a [[dimension>>doc:Glossary.Dimension.WebHome]] value to a mapping vector). It is expected, beyond the standard roles published by the SWG, that communities (such as the official statistics community) will harmonise such roles within their community so that data can be exchanged and shared in a meaningful way within that community.
++The //[[DimensionComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.WebHome]]//, [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]], [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]] and [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]] link to the [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]] that defines its [[name>>doc:IMElements.name.WebHome]] and semantic (/conceptIdentity association to [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]]). The [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]], [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] (but not [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]]) and [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]] can optionally have a +conceptRole association with a [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]] that identifies its [[role>>doc:IMElements.role.WebHome]] in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]], or one of the standard pre-defined roles, i.e., those published in "GUIDELINES FOR SDMX CONCEPT ROLES" by the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] SWG. The use of these roles is to enable applications to process the data in a meaningful way (e.g., relating a dimension [[value>>doc:IMElements.value.WebHome]] to a mapping vector). It is expected, beyond the standard roles published by the SWG, that communities (such as the official statistics community) will harmonise such roles within their community so that data can be exchanged and shared in a meaningful way within that community.
--The valid values for a //DimensionComponent//, [[Measure>>doc:Glossary.Measure.WebHome]], DataAttribute or MetadataAttribute, when used in this DataStructureDefinition, are defined by the [[Representation>>doc:Glossary.Representation.WebHome]]. This [[Representation>>doc:Glossary.Representation.WebHome]] is taken from the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) definition (coreRepresentation) unless it is overridden in this DataStructureDefinition (localRepresentation) – see Figure 28. Note also that TimeDimension is constrained to specific FacetValueTypes. Moreover, the [[Representations>>doc:Glossary.Representation.WebHome]] of MetadataAttributes are specified in the corresponding MetadataStructureDefinition, linked by the DataStructureDefinition.
++The valid values for a //[[DimensionComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.WebHome]]//, [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]], [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] or [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]], when used in this [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]], are defined by the [[Representation>>doc:IMElements.Representation.WebHome]]. This [[Representation>>doc:IMElements.Representation.WebHome]] is taken from the [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]] definition ([[coreRepresentation>>doc:IMElements.coreRepresentation.WebHome]]) unless it is overridden in this [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] ([[localRepresentation>>doc:IMElements.localRepresentation.WebHome]]) – see Figure 28. Note also that [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]] is constrained to specific FacetValueTypes. Moreover, the Representations of MetadataAttributes are specified in the corresponding [[MetadataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.MetadataStructureDefinition.WebHome]], linked by the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]].
--There will always be a DimensionDescriptor grouping that identifies all of the [[Dimension>>doc:Glossary.Dimension.WebHome]] comprising the full key. Together the [[Dimensions>>doc:Glossary.Dimension.WebHome]] specify the key of an Observation.
++There will always be a [[DimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.DimensionDescriptor.WebHome]] [[grouping>>doc:IMElements.grouping.WebHome]] that identifies all of the [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] comprising the full key. Together the Dimensions specify the key of an [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]].
--The //DimensionComponent// can optionally be grouped by multiple GroupDimensionDescriptors each of which identifies the group of [[Dimensions>>doc:Glossary.Dimension.WebHome]] that can form a partial key. The GroupDimensionDescriptor must be identified (GroupDimensionDescriptor.id) and this is used in the GroupKey of the [[DataSet>>doc:Glossary.Data set.WebHome]] to declare which DataAttributes or MetadataAttributes are reported at this group level in the [[DataSet>>doc:Glossary.Data set.WebHome]].
++The //[[DimensionComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.WebHome]]// can optionally be grouped by multiple GroupDimensionDescriptors each of which identifies the group of Dimensions that can form a partial key. The [[GroupDimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.GroupDimensionDescriptor.WebHome]] must be identified ([[GroupDimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.GroupDimensionDescriptor.WebHome]].id) and this is used in the [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]] of the [[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] to declare which DataAttributes or MetadataAttributes are reported at this group level in the [[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]].
--There can be a maximum of one TimeDimension specified in the DimensionDescriptor. The TimeDimension is used to specify the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) used to convey the [[time period>>doc:Glossary.Time period.WebHome]] of the observation in a [[data set>>doc:Glossary.Data set.WebHome]]. The TimeDimension must contain a valid [[representation>>doc:Glossary.Representation.WebHome]] of time and cannot be coded.
++There can be a maximum of one [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]] specified in the [[DimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.DimensionDescriptor.WebHome]]. The [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]] is used to specify the [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]] used to convey the [[time period>>doc:sdmx:Glossary 2\.1.Time period.WebHome]] of the observation in a [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]. The [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]] must contain a valid representation of time and cannot be coded.
--There can be one or more [[Measures>>doc:Glossary.Measure.WebHome]] under the MeasureDescriptor. [[Measures>>doc:Glossary.Measure.WebHome]] represent the observable phenomena. Each [[Measure>>doc:Glossary.Measure.WebHome]] may have a valid [[representation>>doc:Glossary.Representation.WebHome]], a maxOccurs [[attribute>>doc:Glossary.Attribute.WebHome]] limiting the maximum number of values per [[Measure>>doc:Glossary.Measure.WebHome]] (which may be set to 'unbounded' for unlimited occurrences), as well as a minOccurs [[attribute>>doc:Glossary.Attribute.WebHome]], indicating the minimum required number of values, when the [[Measure>>doc:Glossary.Measure.WebHome]] is reported. If minOccurs or maxOccurs are omitted (they both default to ‘1’), the [[Measure>>doc:Glossary.Measure.WebHome]] is considered to take a single value; otherwise, it is an array. Moreover, the usage [[attribute>>doc:Glossary.Attribute.WebHome]] indicates whether a [[Measure>>doc:Glossary.Measure.WebHome]] must be reported or not, by the corresponding values: mandatory or optional.
++There can be one or more Measures under the [[MeasureDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.MeasureDescriptor.WebHome]]. Measures represent the observable phenomena. Each [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]] may have a valid representation, a [[maxOccurs>>doc:IMElements.maxOccurs.WebHome]] [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] limiting the maximum number of values per [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]] (which may be set to 'unbounded' for unlimited occurrences), as well as a [[minOccurs>>doc:IMElements.minOccurs.WebHome]] [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]], indicating the minimum required number of values, when the [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]] is reported. If [[minOccurs>>doc:IMElements.minOccurs.WebHome]] or [[maxOccurs>>doc:IMElements.maxOccurs.WebHome]] are omitted (they both default to ‘1’), the [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]] is considered to take a single [[value>>doc:IMElements.value.WebHome]]; otherwise, it is an array. Moreover, the usage [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] indicates whether a [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]] must be reported or not, by the corresponding values: mandatory or optional.
--The AttributeDescriptor may contain one or more //[[Attribute>>doc:Glossary.Attribute.WebHome]]//s, i.e., at least one DataAttribute definition or one MetadataAttribute reference.
++The [[AttributeDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.AttributeDescriptor.WebHome]] may contain one or more //[[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]]//s, i.e., at least one [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] definition or one [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]] reference.
--The DataAttribute defines a characteristic of data that are collected or disseminated and is grouped in the DataStructureDefinition by a single AttributeDescriptor. The DataAttribute can be indicated if it must be reported or not, by the corresponding value of the usage [[attribute>>doc:Glossary.Attribute.WebHome]]: i.e., mandatory or optional. The property minOccurs specifies the minimum number of array values to be included when the DataAttribute is reported. Moreover, a maxOccurs [[attribute>>doc:Glossary.Attribute.WebHome]] indicates whether the DataAttribute may need to report more than one values, i.e., an array of values. The DataAttribute may play a specific role in the structure and this is specified by the +role association to the [[Concept>>doc:Glossary.Concept.WebHome]] that identifies its role.
++The [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] defines a characteristic of data that are collected or disseminated and is grouped in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] by a single [[AttributeDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.AttributeDescriptor.WebHome]]. The [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] can be indicated if it must be reported or not, by the corresponding [[value>>doc:IMElements.value.WebHome]] of the usage [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]]: i.e., mandatory or optional. The property [[minOccurs>>doc:IMElements.minOccurs.WebHome]] specifies the minimum number of array values to be included when the [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] is reported. Moreover, a [[maxOccurs>>doc:IMElements.maxOccurs.WebHome]] [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] indicates whether the [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] may need to report more than one values, i.e., an array of values. The [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] may play a specific [[role>>doc:IMElements.role.WebHome]] in the [[structure>>doc:IMElements.structure.WebHome]] and this is specified by the +[[role>>doc:IMElements.role.WebHome]] association to the [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]] that identifies its [[role>>doc:IMElements.role.WebHome]].
--The MetadataAttribute defines [[reference metadata>>doc:Glossary.Reference metadata.WebHome]] that may be collected or disseminated and is grouped together with DataAttribute under the AttributeDescriptor.
++The [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]] defines [[reference metadata>>doc:sdmx:Glossary 2\.1.Reference metadata.WebHome]] that may be collected or disseminated and is grouped together with [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] under the [[AttributeDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.AttributeDescriptor.WebHome]].
--A DataAttribute or a MetadataAttribute (i.e., an //AttributeComponent//) is specified as being +relatedTo an AttributeRelationship, which defines the constructs to which the //AttributeComponent// is to be reported within a //[[DataSet>>doc:Glossary.Data set.WebHome]]//. An //AttributeComponent// can be specified as being related to one of the following [[artefacts>>doc:Glossary.Artefact.WebHome]]:
++A [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] or a [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]] (i.e., an //[[AttributeComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.WebHome]]//) is specified as being +[[relatedTo>>doc:IMElements.relatedTo.WebHome]] an [[AttributeRelationship>>doc:IMElements.AttributeRelationship.WebHome]], which defines the constructs to which the //[[AttributeComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.WebHome]]// is to be reported within a //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]//. An //[[AttributeComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.WebHome]]// can be specified as being related to one of the following [[artefacts>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]]:
--* All data within the [[dataset>>doc:Glossary.Data set.WebHome]] (DataflowRelationship) – this is equivalent to attaching an [[Attribute>>doc:Glossary.Attribute.WebHome]] to all data within the [[Dataflow>>doc:Glossary.Dataflow.WebHome]].
--* [[Dimension>>doc:Glossary.Dimension.WebHome]] or set of [[Dimensions>>doc:Glossary.Dimension.WebHome]] (DimensionRelationship)
--* Set of [[Dimensions>>doc:Glossary.Dimension.WebHome]] specified by a GroupKey (GroupRelationship – this is retained for compatibility reasons – or +groupKey of the DimensionRelationship)
--* Observation (ObservationRelationship)
--* In addition to the positioning of an //AttributeComponent// within a //[[DataSet>>doc:Glossary.Data set.WebHome]]//, another relationship indicates the [[Measure>>doc:Glossary.Measure.WebHome]](s) for which the //AttributeComponent// is reported. Regardless of the position of the //AttributeComponent// within the //[[DataSet>>doc:Glossary.Data set.WebHome]]//, the //AttributeComponent// may concern one, more than one, or all [[Measures>>doc:Glossary.Measure.WebHome]] included in the [[DSD>>doc:Glossary.Data structure definition.WebHome]]. This is expressed using the MeasureRelationship class, which relates a DataAttribute to one or more [[Measures>>doc:Glossary.Measure.WebHome]]. Lack of the MeasureRelationship defaults to a relationship to all [[Measures>>doc:Glossary.Measure.WebHome]].
++* All data within the [[dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] (DataflowRelationship) – this is equivalent to attaching an [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] to all data within the [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]].
++* [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] or set of Dimensions ([[DimensionRelationship>>doc:IMElements.AttributeRelationship.DimensionRelationship.WebHome]])
++* Set of Dimensions specified by a [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]] ([[GroupRelationship>>doc:IMElements.AttributeRelationship.GroupRelationship.WebHome]] – this is retained for compatibility reasons – or +[[groupKey>>doc:IMElements.groupKey.WebHome]] of the [[DimensionRelationship>>doc:IMElements.AttributeRelationship.DimensionRelationship.WebHome]])
++* [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]] ([[ObservationRelationship>>doc:IMElements.AttributeRelationship.ObservationRelationship.WebHome]])
++* In addition to the positioning of an //[[AttributeComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.WebHome]]// within a //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]//, another relationship indicates the [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]](s) for which the //[[AttributeComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.WebHome]]// is reported. Regardless of the position of the //[[AttributeComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.WebHome]]// within the //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]//, the //[[AttributeComponent>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.WebHome]]// may concern one, more than one, or all Measures included in the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]]. This is expressed using the [[MeasureRelationship>>doc:IMElements.AttributeRelationship.MeasureRelationship.WebHome]] class, which relates a [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] to one or more Measures. Lack of the [[MeasureRelationship>>doc:IMElements.AttributeRelationship.MeasureRelationship.WebHome]] defaults to a relationship to all Measures.
  [[image:image55.png]]
  **Figure 29: Attribute Attachment Defined in the Data Structure Definition**
--The following table details the possible relationships a DataAttribute may specify. Note that these relationships are mutually exclusive, and therefore only one of the following is possible.
++The following table details the possible relationships a [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] may specify. Note that these relationships are mutually exclusive, and therefore only one of the following is possible.
  (% style="width:1142.83px" %)
  |**Relationship**|(% style="width:537px" %)**Meaning**|(% style="width:434px" %)**Location in Data Set at which the Attribute is reported**
--|DataflowRelationship|(% style="width:537px" %)The value of the [[attribute>>doc:Glossary.Attribute.WebHome]] is fixed for all data contained in the [[dataset>>doc:Glossary.Data set.WebHome]]. The [[Attribute>>doc:Glossary.Attribute.WebHome]] value applies to all data defined by the underlying [[Dataflow>>doc:Glossary.Dataflow.WebHome]].|(% style="width:434px" %)The [[attribute>>doc:Glossary.Attribute.WebHome]] is reported at the [[Dataset>>doc:Glossary.Data set.WebHome]] level.
--|[[Dimension>>doc:Glossary.Dimension.WebHome]] (1..n)|(% style="width:537px" %)The value of the [[attribute>>doc:Glossary.Attribute.WebHome]] will vary with the value(s) of the referenced [[Dimension>>doc:Glossary.Dimension.WebHome]](s). In this case, Group(s) to which the [[attribute>>doc:Glossary.Attribute.WebHome]] should be attached may optionally be specified.|(% style="width:434px" %)The [[attribute>>doc:Glossary.Attribute.WebHome]] is reported at the lowest level of the [[Dimension>>doc:Glossary.Dimension.WebHome]] to which the [[Attribute>>doc:Glossary.Attribute.WebHome]] is related, otherwise at the level of the Group if Attachment Group(s) is specified.
--|Group|(% style="width:537px" %)The value of the [[Attribute>>doc:Glossary.Attribute.WebHome]] varies with combination of values for all of the [[Dimensions>>doc:Glossary.Dimension.WebHome]] contained in the Group. This is added as a convenience to listing all [[Dimensions>>doc:Glossary.Dimension.WebHome]] and the attachment Group, but should only be used when the [[Attribute>>doc:Glossary.Attribute.WebHome]] value varies based on all Group [[Dimension>>doc:Glossary.Dimension.WebHome]] values.|(% style="width:434px" %)The [[attribute>>doc:Glossary.Attribute.WebHome]] is reported at the level of Group.
--|Observation|(% style="width:537px" %)The value of the [[Attribute>>doc:Glossary.Attribute.WebHome]] varies with the observed value.|(% style="width:434px" %)The [[attribute>>doc:Glossary.Attribute.WebHome]] is reported at the level of Observation.
++|DataflowRelationship|(% style="width:537px" %)The [[value>>doc:IMElements.value.WebHome]] of the [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is fixed for all data contained in the [[dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]. The [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] [[value>>doc:IMElements.value.WebHome]] applies to all data defined by the underlying [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]].|(% style="width:434px" %)The [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is reported at the [[Dataset>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] level.
++|[[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] (1..n)|(% style="width:537px" %)The [[value>>doc:IMElements.value.WebHome]] of the [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] will vary with the [[value>>doc:IMElements.value.WebHome]](s) of the referenced [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]](s). In this case, Group(s) to which the [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] should be attached may optionally be specified.|(% style="width:434px" %)The [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is reported at the lowest level of the [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] to which the [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is related, otherwise at the level of the Group if Attachment Group(s) is specified.
++|Group|(% style="width:537px" %)The [[value>>doc:IMElements.value.WebHome]] of the [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] varies with combination of values for all of the Dimensions contained in the Group. This is added as a convenience to listing all Dimensions and the attachment Group, but should only be used when the [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] [[value>>doc:IMElements.value.WebHome]] varies based on all Group [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] values.|(% style="width:434px" %)The [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is reported at the level of Group.
++|[[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]]|(% style="width:537px" %)The [[value>>doc:IMElements.value.WebHome]] of the [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] varies with the observed [[value>>doc:IMElements.value.WebHome]].|(% style="width:434px" %)The [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is reported at the level of [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]].
  [[image:image56.png]]
  **Figure 30: Representation of DSD Components**
--Each of [[Dimension>>doc:Glossary.Dimension.WebHome]], TimeDimension, [[Measure>>doc:Glossary.Measure.WebHome]], DataAttribute and MetadataAttribute can have a [[Representation>>doc:Glossary.Representation.WebHome]] specified (using the localRepresentation association). If this is not specified in the DataStructureDefinition then the [[representation>>doc:Glossary.Representation.WebHome]] specified for (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) (coreRepresentation) is used. [[Measure>>doc:Glossary.Measure.WebHome]], and DataAttribute may be also represented by multilingual text (as seen in the [[DataSet>>doc:Glossary.Data set.WebHome]] diagram further down). An exception is the MetadataAttribute, where its [[Representation>>doc:Glossary.Representation.WebHome]] is specified in the MetadataStructureDefinition.
++Each of [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]], [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]], [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]], [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] and [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]] can have a [[Representation>>doc:IMElements.Representation.WebHome]] specified (using the [[localRepresentation>>doc:IMElements.localRepresentation.WebHome]] association). If this is not specified in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] then the representation specified for (% style="color:#e74c3c" %)[[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]](%%) ([[coreRepresentation>>doc:IMElements.coreRepresentation.WebHome]]) is used. [[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]], and [[DataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.DataAttribute.WebHome]] may be also represented by multilingual [[text>>doc:IMElements.text.WebHome]] (as seen in the [[DataSet>>doc:Glossary.Data set.WebHome]] diagram further down). An exception is the [[MetadataAttribute>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.AttributeComponent.MetadataAttribute.WebHome]], where its [[Representation>>doc:IMElements.Representation.WebHome]] is specified in the [[MetadataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.MetadataStructureDefinition.WebHome]].
--A DataStructureDefinition can be extended to form a derived DataStructureDefinition. This is supported in the StructureMap.
++A [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] can be extended to form a derived [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]. This is supported in the StructureMap.
  ==== 5.3.2.2 Definitions ====
  (% style="width:981.835px" %)
  |(% style="width:204px" %)**Class**|(% style="width:236px" %)**Feature**|(% style="width:538px" %)**Description**
--|(% style="width:204px" %)StructureUsage|(% style="width:236px" %) |(% style="width:538px" %)See “[[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Base”.
--|(% style="width:204px" %)[[Dataflow>>doc:Glossary.Dataflow.WebHome]]|(% style="width:236px" %)(((
++|(% style="width:204px" %)StructureUsage|(% style="width:236px" %) |(% style="width:538px" %)See “[[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base”.
++|(% style="width:204px" %)[[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]]|(% style="width:236px" %)(((
  Inherits from
  //StructureUsage//
--)))|(% style="width:538px" %)Abstract concept (i.e., the structure without any data) of a flow of data that providers will provide for different reference periods.
--|(% style="width:204px" %) |(% style="width:236px" %)/structure|(% style="width:538px" %)Associates a [[Dataflow>>doc:Glossary.Dataflow.WebHome]] to the [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]].
--|(% style="width:204px" %) |(% style="width:236px" %)dimensionConstraint|(% style="width:538px" %)A list of [[Dimensions>>doc:Glossary.Dimension.WebHome]] which the [[Dataflow>>doc:Glossary.Dataflow.WebHome]] uses. This is only required when the referenced DataStructureDefinition has the evolvingStructure property set to true and when the association to the DataStructureDefinition in on the latest minor (% style="color:#e74c3c" %)[[version>>doc:Glossary.Version.WebHome]]{{footnote}}Referencing the latest minor version of the Data Structure is achieved by the reference including the plus operator on the minor version to indicate it links to the latest stable version, for example 2.0+.0 will resolve to the highest version 2.x.y.{{/footnote}}(%%).
++)))|(% style="width:538px" %)Abstract concept (i.e., the structure without any data) of a flow of data that providers will provide for different [[reference periods>>doc:sdmx:Glossary 2\.1.Reference period.WebHome]].
++|(% style="width:204px" %) |(% style="width:236px" %)/structure|(% style="width:538px" %)Associates a Dataflow to the [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++|(% style="width:204px" %) |(% style="width:236px" %)dimensionConstraint|(% style="width:538px" %)A list of Dimensions which the Dataflow uses. This is only required when the referenced DataStructureDefinition has the evolvingStructure property set to true and when the association to the DataStructureDefinition in on the latest minor version{{footnote}}Referencing the latest minor version of the Data Structure is achieved by the reference including the plus operator on the minor version to indicate it links to the latest stable version, for example 2.0+.0 will resolve to the highest version 2.x.y.{{/footnote}}.
  |(% style="width:204px" %)DataStructureDefinition|(% style="width:236px" %) |(% style="width:538px" %)A collection of metadata concepts, their structure and usage when used to collect or disseminate data.
--|(% style="width:204px" %) |(% style="width:236px" %)/grouping|(% style="width:538px" %)An association to a set of metadata concepts that have an identified structural role in a [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]].
--|(% style="width:204px" %) |(% style="width:236px" %)evolvingStructure|(% style="width:538px" %)An optional boolean property, defaulting to false. When true the DataStructureDefinition may have new [[Dimensions>>doc:Glossary.Dimension.WebHome]] added without having to change its major [[version>>doc:Glossary.Version.WebHome]] number.
++|(% style="width:204px" %) |(% style="width:236px" %)/grouping|(% style="width:538px" %)An association to a set of metadata concepts that have an identified structural role in a [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++|(% style="width:204px" %) |(% style="width:236px" %)evolvingStructure|(% style="width:538px" %)An optional boolean property, defaulting to false. When true the DataStructureDefinition may have new Dimensions added without having to change its major version number.
  |(% style="width:204px" %)GroupDimensionDescriptor|(% style="width:236px" %)(((
  Inherits from
  //ComponentList//
--)))|(% style="width:538px" %)A set of metadata concepts that define a partial key derived from the [[Dimension>>doc:Glossary.Dimension.WebHome]] Descriptor in a [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]].
--|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to the [[Dimension>>doc:Glossary.Dimension.WebHome]] [[components>>doc:Glossary.Component.WebHome]] that comprise the group.
++)))|(% style="width:538px" %)A set of metadata concepts that define a partial key derived from the Dimension Descriptor in a [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to the Dimension components that comprise the group.
  |(% style="width:204px" %)DimensionDescriptor|(% style="width:236px" %)(((
  Inherits from
  //ComponentList//
--)))|(% style="width:538px" %)An ordered set of metadata concepts that, combined, classify a statistical series, and whose values, when combined (the key) in an instance such as a [[data set>>doc:Glossary.Data set.WebHome]], uniquely identify a specific observation.
--|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to the [[Dimension>>doc:Glossary.Dimension.WebHome]] and Time [[Dimension>>doc:Glossary.Dimension.WebHome]] comprising the Key Descriptor.
++)))|(% style="width:538px" %)An ordered set of metadata concepts that, combined, classify a statistical [[series>>doc:sdmx:Glossary 2\.1.Series.WebHome]], and whose values, when combined (the key) in an instance such as a [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]], uniquely identify a specific observation.
++|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to the Dimension and Time Dimension comprising the Key Descriptor.
  |(% style="width:204px" %)AttributeDescriptor|(% style="width:236px" %)(((
  Inherits from
  //ComponentList//
--)))|(% style="width:538px" %)A set metadata concepts that define the [[Attributes>>doc:Glossary.Attribute.WebHome]] of a [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]].
--|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to a Data [[Attribute>>doc:Glossary.Attribute.WebHome]] [[component>>doc:Glossary.Component.WebHome]].
--|(% style="width:204px" %)MeasureDescriptor|(% style="width:236px" %)(((
++)))|(% style="width:538px" %)A set metadata concepts that define the [[Attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] of a [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to a Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] component.
++|(% style="width:204px" %)[[MeasureDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.MeasureDescriptor.WebHome]]|(% style="width:236px" %)(((
  Inherits from
  //ComponentList//
--)))|(% style="width:538px" %)A metadata concept that defines the [[Measures>>doc:Glossary.Measure.WebHome]] of a [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]].
--|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to a [[Measure>>doc:Glossary.Measure.WebHome]] [[component>>doc:Glossary.Component.WebHome]].
++)))|(% style="width:538px" %)A metadata concept that defines the Measures of a [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++|(% style="width:204px" %) |(% style="width:236px" %)/components|(% style="width:538px" %)An association to a Measure component.
  |(% style="width:204px" %)//DimensionComponent//|(% style="width:236px" %)(((
  Inherits from
--//[[Component>>doc:Glossary.Component.WebHome]]//
++//[[Component>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.WebHome]]//
  Sub class
--[[Dimension>>doc:Glossary.Dimension.WebHome]]
++[[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]]
  TimeDimension
--)))|(% style="width:538px" %)An abstract class representing any [[Component>>doc:Glossary.Component.WebHome]] that can be used for identifying observations.
--|(% style="width:211px" %) |(% style="width:235px" %)Order|(% style="width:534px" %)Specifies the order of the [[Dimension>>doc:Glossary.Dimension.WebHome]] [[Components>>doc:Glossary.Component.WebHome]] within the [[DSD>>doc:Glossary.Data structure definition.WebHome]]. The property is used to indicate the position of the [[Dimension>>doc:Glossary.Dimension.WebHome]] [[Component>>doc:Glossary.Component.WebHome]] and determines the Key for identifying observations, or series. The Time [[Dimension>>doc:Glossary.Dimension.WebHome]], when specified, must be the last within the [[Dimension>>doc:Glossary.Dimension.WebHome]] Descriptor.
--|(% style="width:211px" %)[[Dimension>>doc:Glossary.Dimension.WebHome]]|(% style="width:235px" %)(((
++)))|(% style="width:538px" %)An abstract class representing any Component that can be used for identifying observations.
++|(% style="width:211px" %) |(% style="width:235px" %)[[Order>>doc:IMElements.Order.WebHome]]|(% style="width:534px" %)Specifies the order of the Dimension Components within the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]]. The property is used to indicate the position of the Dimension Component and determines the Key for identifying observations, or [[series>>doc:sdmx:Glossary 2\.1.Series.WebHome]]. The Time Dimension, when specified, must be the last within the Dimension Descriptor.
++|(% style="width:211px" %)[[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]]|(% style="width:235px" %)(((
  Inherits from
  //DimensionComponent//
--)))|(% style="width:534px" %)A metadata concept used (most probably together with other metadata concepts) to classify a statistical series, e.g., a statistical concept indicating a certain [[economic activity>>doc:Glossary.Economic activity.WebHome]] or a geographical reference area.
--|(% style="width:211px" %) |(% style="width:235px" %)/role|(% style="width:534px" %)Association to the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) that specifies the role that that the [[Dimension>>doc:Glossary.Dimension.WebHome]] plays in the [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]].
--|(% style="width:211px" %) |(% style="width:235px" %)/conceptIdentity|(% style="width:534px" %)An association to the metadata concept which defines the semantic of the [[Dimension>>doc:Glossary.Dimension.WebHome]].
++)))|(% style="width:534px" %)A metadata concept used (most probably together with other metadata concepts) to classify a statistical [[series>>doc:sdmx:Glossary 2\.1.Series.WebHome]], e.g., a statistical concept indicating a certain [[economic activity>>doc:sdmx:Glossary 2\.1.Economic activity.WebHome]] or a geographical [[reference area>>doc:sdmx:Glossary 2\.1.Reference area.WebHome]].
++|(% style="width:211px" %) |(% style="width:235px" %)/role|(% style="width:534px" %)Association to the Concept that specifies the role that that the Dimension plays in the [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++|(% style="width:211px" %) |(% style="width:235px" %)/conceptIdentity|(% style="width:534px" %)An association to the metadata concept which defines the semantic of the Dimension.
  |(% style="width:211px" %)TimeDimension|(% style="width:235px" %)(((
  Inherits from
  //DimensionComponent//
--)))|(% style="width:534px" %)A metadata concept that identifies the [[component>>doc:Glossary.Component.WebHome]] in the key structure that has the role of “time”.
++)))|(% style="width:534px" %)A metadata concept that identifies the component in the key structure that has the role of “time”.
  |(% style="width:211px" %)DataAttribute|(% style="width:235px" %)(((
  Inherits from
--//[[Component>>doc:Glossary.Component.WebHome]]//
++//[[Component>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.WebHome]]//
  )))|(% style="width:534px" %)A characteristic of an object or entity.
--|(% style="width:211px" %) |(% style="width:235px" %)/role|(% style="width:534px" %)Association to the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) that specifies the role that that the Data [[Attribute>>doc:Glossary.Attribute.WebHome]] plays in the [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]].
--|(% style="width:211px" %) |(% style="width:235px" %)minOccurs|(% style="width:534px" %)Defines the minimum required occurrences for the [[Attribute>>doc:Glossary.Attribute.WebHome]]. When equals to zero, the [[Attribute>>doc:Glossary.Attribute.WebHome]] is conditional.
--|(% style="width:211px" %) |(% style="width:235px" %)maxOccurs|(% style="width:534px" %)Defines the maximum allowed occurrences for the [[Attribute>>doc:Glossary.Attribute.WebHome]].
--|(% style="width:211px" %) |(% style="width:235px" %)Usage|(% style="width:534px" %)Defines whether a Data [[Attribute>>doc:Glossary.Attribute.WebHome]] must be reported or not.
--|(% style="width:211px" %) |(% style="width:235px" %)+relatedTo|(% style="width:534px" %)Association to an [[Attribute>>doc:Glossary.Attribute.WebHome]] Relationship.
--|(% style="width:211px" %) |(% style="width:235px" %)/conceptIdentity|(% style="width:534px" %)An association to the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) which defines the semantic of the [[component>>doc:Glossary.Component.WebHome]].
--|(% style="width:211px" %)[[Measure>>doc:Glossary.Measure.WebHome]]|(% style="width:235px" %)(((
++|(% style="width:211px" %) |(% style="width:235px" %)/role|(% style="width:534px" %)Association to the Concept that specifies the role that that the Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] plays in the [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
++|(% style="width:211px" %) |(% style="width:235px" %)minOccurs|(% style="width:534px" %)Defines the minimum required occurrences for the [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]]. When equals to zero, the [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is conditional.
++|(% style="width:211px" %) |(% style="width:235px" %)maxOccurs|(% style="width:534px" %)Defines the maximum allowed occurrences for the [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]].
++|(% style="width:211px" %) |(% style="width:235px" %)[[Usage>>doc:IMElements.Usage.WebHome]]|(% style="width:534px" %)Defines whether a Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] must be reported or not.
++|(% style="width:211px" %) |(% style="width:235px" %)+relatedTo|(% style="width:534px" %)Association to an [[Attribute Relationship>>doc:sdmx:Glossary 2\.1.Attribute relationship.WebHome]].
++|(% style="width:211px" %) |(% style="width:235px" %)/conceptIdentity|(% style="width:534px" %)An association to the Concept which defines the semantic of the component.
++|(% style="width:211px" %)[[Measure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.Measure.WebHome]]|(% style="width:235px" %)(((
  Inherits from
--//[[Component>>doc:Glossary.Component.WebHome]]//
--)))|(% style="width:534px" %)The metadata concept that is the phenomenon to be measured in a [[data set>>doc:Glossary.Data set.WebHome]]. In a [[data set>>doc:Glossary.Data set.WebHome]] the instance of the [[measure>>doc:Glossary.Measure.WebHome]] is often called the observation.
--|(% style="width:211px" %) |(% style="width:235px" %)/conceptIdentity|(% style="width:534px" %)An association to the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) which carries the values of the [[measures>>doc:Glossary.Measure.WebHome]].
--|(% style="width:211px" %) |(% style="width:235px" %)minOccurs|(% style="width:534px" %)Defines the minimum required occurrences for the [[Measure>>doc:Glossary.Measure.WebHome]]. When equals to zero, the [[Measure>>doc:Glossary.Measure.WebHome]] is conditional.
--|(% style="width:211px" %) |(% style="width:235px" %)maxOccurs|(% style="width:534px" %)Defines the maximum allowed occurrences for the [[Measure>>doc:Glossary.Measure.WebHome]].
--|(% style="width:211px" %) |(% style="width:235px" %)Usage|(% style="width:534px" %)Defines whether a [[Measure>>doc:Glossary.Measure.WebHome]] must be reported or not.
++//[[Component>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.WebHome]]//
++)))|(% style="width:534px" %)The metadata concept that is the phenomenon to be measured in a [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]. In a [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] the instance of the measure is often called the observation.
++|(% style="width:211px" %) |(% style="width:235px" %)/conceptIdentity|(% style="width:534px" %)An association to the Concept which carries the values of the measures.
++|(% style="width:211px" %) |(% style="width:235px" %)minOccurs|(% style="width:534px" %)Defines the minimum required occurrences for the Measure. When equals to zero, the Measure is conditional.
++|(% style="width:211px" %) |(% style="width:235px" %)maxOccurs|(% style="width:534px" %)Defines the maximum allowed occurrences for the Measure.
++|(% style="width:211px" %) |(% style="width:235px" %)[[Usage>>doc:IMElements.Usage.WebHome]]|(% style="width:534px" %)Defines whether a Measure must be reported or not.
  |(% style="width:211px" %)//AttributeRelationship//|(% style="width:235px" %)(((
  Abstract Class
  Sub classes
  ObservationRelationship
  GroupRelationship DimensionRelationship
--)))|(% style="width:534px" %)Specifies the type of [[artefact>>doc:Glossary.Artefact.WebHome]] to which a Data [[Attribute>>doc:Glossary.Attribute.WebHome]] can be attached in a [[Data Set>>doc:Glossary.Data set.WebHome]].
--|(% style="width:211px" %)ObservationRelationship|(% style="width:235px" %) |(% style="width:534px" %)The Data [[Attribute>>doc:Glossary.Attribute.WebHome]] is related to the observations of the [[Data Set>>doc:Glossary.Data set.WebHome]].
--|(% style="width:211px" %)GroupRelationship|(% style="width:235px" %) |(% style="width:534px" %)The Data [[Attribute>>doc:Glossary.Attribute.WebHome]] is related to a Group [[Dimension>>doc:Glossary.Dimension.WebHome]] Descriptor construct.
--|(% style="width:211px" %) |(% style="width:235px" %)+groupKey|(% style="width:534px" %)An association to the Group [[Dimension>>doc:Glossary.Dimension.WebHome]] Descriptor
--|(% style="width:211px" %)DimensionRelationship|(% style="width:235px" %) |(% style="width:534px" %)The Data [[Attribute>>doc:Glossary.Attribute.WebHome]] is related to a set of [[Dimensions>>doc:Glossary.Dimension.WebHome]].
--|(% style="width:211px" %) |(% style="width:235px" %)+dimensions|(% style="width:534px" %)Association to the set of [[Dimensions>>doc:Glossary.Dimension.WebHome]] to which the Data [[Attribute>>doc:Glossary.Attribute.WebHome]] is related.
--|(% style="width:211px" %) |(% style="width:235px" %)+groupKey|(% style="width:534px" %)Association to the Group [[Dimension>>doc:Glossary.Dimension.WebHome]] Descriptor which specifies the set of [[Dimensions>>doc:Glossary.Dimension.WebHome]] to which the Data [[Attribute>>doc:Glossary.Attribute.WebHome]] is attached.
--|(% style="width:211px" %)MeasureRelationship|(% style="width:235px" %) |(% style="width:534px" %)The [[Measures>>doc:Glossary.Measure.WebHome]] that a Data [[Attribute>>doc:Glossary.Attribute.WebHome]] is reported for.
--|(% style="width:211px" %) |(% style="width:235px" %)+measures|(% style="width:534px" %)Association to the set of [[Measures>>doc:Glossary.Measure.WebHome]] to which a Data [[Attribute>>doc:Glossary.Attribute.WebHome]] is related to.
--|(% style="width:211px" %)SentinelValuesType|(% style="width:235px" %) |(% style="width:534px" %)This [[facet>>doc:Glossary.Facet.WebHome]] indicates that an [[Attribute>>doc:Glossary.Attribute.WebHome]] or a [[Measure>>doc:Glossary.Measure.WebHome]] has sentinel values with special meaning within their data type. This is realised by providing such values within the TextFormat, in addition to any textType or other [[Facet>>doc:Glossary.Facet.WebHome]].
--|(% style="width:211px" %)SentinelValue|(% style="width:235px" %) |(% style="width:534px" %)A value that has a special meaning within the text format [[representation>>doc:Glossary.Representation.WebHome]] of the [[Component>>doc:Glossary.Component.WebHome]].
++)))|(% style="width:534px" %)Specifies the type of [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] to which a Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] can be attached in a [[Data Set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]].
++|(% style="width:211px" %)ObservationRelationship|(% style="width:235px" %) |(% style="width:534px" %)The Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is related to the observations of the [[Data Set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]].
++|(% style="width:211px" %)GroupRelationship|(% style="width:235px" %) |(% style="width:534px" %)The Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is related to a Group Dimension Descriptor construct.
++|(% style="width:211px" %) |(% style="width:235px" %)+groupKey|(% style="width:534px" %)An association to the Group Dimension Descriptor
++|(% style="width:211px" %)DimensionRelationship|(% style="width:235px" %) |(% style="width:534px" %)The Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is related to a set of Dimensions.
++|(% style="width:211px" %) |(% style="width:235px" %)+dimensions|(% style="width:534px" %)Association to the set of Dimensions to which the Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is related.
++|(% style="width:211px" %) |(% style="width:235px" %)+groupKey|(% style="width:534px" %)Association to the Group Dimension Descriptor which specifies the set of Dimensions to which the Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is attached.
++|(% style="width:211px" %)MeasureRelationship|(% style="width:235px" %) |(% style="width:534px" %)The Measures that a Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is reported for.
++|(% style="width:211px" %) |(% style="width:235px" %)+measures|(% style="width:534px" %)Association to the set of Measures to which a Data [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] is related to.
++|(% style="width:211px" %)SentinelValuesType|(% style="width:235px" %) |(% style="width:534px" %)This facet indicates that an [[Attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] or a Measure has sentinel values with special meaning within their data type. This is realised by providing such values within the TextFormat, in addition to any textType or other Facet.
++|(% style="width:211px" %)SentinelValue|(% style="width:235px" %) |(% style="width:534px" %)A value that has a special meaning within the text format representation of the Component.
  |(% style="width:211px" %) |(% style="width:235px" %)+name|(% style="width:534px" %)An association of a Sentinel Value to a multilingual name.
  |(% style="width:211px" %) |(% style="width:235px" %)+description|(% style="width:534px" %)An association of a Sentinel Value to a multilingual description.
--The explanation of the classes, [[attributes>>doc:Glossary.Attribute.WebHome]], and associations comprising the [[Representation>>doc:Glossary.Representation.WebHome]] is described in the section on the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Base.
++The explanation of the classes, [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]], and associations comprising the [[Representation>>doc:IMElements.Representation.WebHome]] is described in the section on the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base..
  == 5.4 Data Set – Relationship View ==
  === 5.4.1 Context ===
--A [[data set>>doc:Glossary.Data set.WebHome]] comprises the collection of data values and associated metadata that are collected or disseminated according to a known DataStructureDefinition.
++A [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] comprises the collection of data values and associated [[metadata>>doc:IMElements.metadata.WebHome]] that are collected or disseminated according to a known DataStructureDefinition.
  === 5.4.2 Class Diagram ===
@@ -262,25 +262,25 @@
  ==== 5.4.3.1 Narrative – Data Set ====
--Note that the //[[DataSet>>doc:Glossary.Data set.WebHome]]// must conform to the DataStructureDefinition associated to the [[Dataflow>>doc:Glossary.Dataflow.WebHome]] for which this [[DataSet>>doc:Glossary.Data set.WebHome]] is an “instance of data”. Whilst the model shows the association to the classes of the DataStructureDefinition, this is for conceptual purposes to show the link to the DataStructureDefinition. In the actual //[[DataSet>>doc:Glossary.Data set.WebHome]]// as exchanged there must, of course, be a reference to the DataStructureDefinition and optionally a [[Dataflow>>doc:Glossary.Dataflow.WebHome]] or a ProvisionAgreement, but the DataStructureDefinition is not necessarily exchanged with the data. Therefore, the DataStructureDefinition classes are shown in the grey areas, as these are not a part of the //[[DataSet>>doc:Glossary.Data set.WebHome]]// when the //[[DataSet>>doc:Glossary.Data set.WebHome]]// is exchanged. However, the [[structural metadata>>doc:Glossary.Structural metadata.WebHome]] in the DataStructureDefinition can be used by an application to validate the contents of the //[[DataSet>>doc:Glossary.Data set.WebHome]]// in terms of the valid content of a //KeyValue// as defined by the [[Representation>>doc:Glossary.Representation.WebHome]] in the DataStructureDefinition.
++Note that the //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// must conform to the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] associated to the [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]] for which this [[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] is an “instance of data”. Whilst the model shows the association to the classes of the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]], this is for conceptual purposes to show the link to the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]. In the actual //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// as exchanged there must, of course, be a reference to the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] and optionally a [[Dataflow>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Dataflow.WebHome]] or a ProvisionAgreement, but the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] is not necessarily exchanged with the data. Therefore, the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] classes are shown in the grey areas, as these are not a part of the //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// when the //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// is exchanged. However, the [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]] in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] can be used by an application to validate the contents of the //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// in terms of the valid content of a //[[KeyValue>>doc:IMElements.KeyValue.WebHome]]// as defined by the [[Representation>>doc:IMElements.Representation.WebHome]] in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]].
--An organisation playing the role of DataProvider can be responsible for one or more //[[DataSet>>doc:Glossary.Data set.WebHome]]//.
++An organisation playing the [[role>>doc:IMElements.role.WebHome]] of [[DataProvider>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Organisation.DataProvider.WebHome]] can be responsible for one or more //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]//.
--A //[[DataSet>>doc:Glossary.Data set.WebHome]]// is formatted as a DataStructureDefinition specific [[data set>>doc:Glossary.Data set.WebHome]] (StructureSpecificDataSet). The structured [[data set>>doc:Glossary.Data set.WebHome]] is structured according to one specific DataStructureDefinition; hence the latter is required for validation at the syntax level.
++A //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// is formatted as a [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] specific [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] ([[StructureSpecificDataSet>>doc:IMElements.AnnotableArtefact.DataSet.StructureSpecificDataSet.WebHome]]). The structured [[data set>>doc:sdmx:Glossary 2\.1.Data set.WebHome]] is structured according to one specific [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]; hence the latter is required for validation at the syntax level.
--A //[[DataSet>>doc:Glossary.Data set.WebHome]]// is a collection of a set of //Observation//s that share the same dimensionality, which is specified by a set of unique [[components>>doc:Glossary.Component.WebHome]] ([[Dimension>>doc:Glossary.Dimension.WebHome]], TimeDimension) defined in the DimensionDescriptor of the DataStructureDefinition, together with associated //AttributeValue//s that define specific characteristics about the [[artefact>>doc:Glossary.Artefact.WebHome]] to which it is attached – //Observation//s, set of [[Dimensions>>doc:Glossary.Dimension.WebHome]]. It can be structured in terms of a SeriesKey to which //Observation//s are reported.
++A //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// is a collection of a set of //Observation//s that share the same dimensionality, which is specified by a set of unique [[components>>doc:IMElements.components.WebHome]] ([[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]], [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]]) defined in the [[DimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.DimensionDescriptor.WebHome]] of the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]], together with associated //AttributeValue//s that define specific characteristics about the [[artefact>>doc:sdmx:Glossary 2\.1.Artefact.WebHome]] to which it is attached – //Observation//s, set of Dimensions. It can be structured in terms of a [[SeriesKey>>doc:IMElements.AnnotableArtefact.Key.SeriesKey.WebHome]] to which //Observation//s are reported.
--The //Observation// can be the value(s) of the variable(s) being measured for the (% style="color:#e74c3c" %)[[Concept>>doc:Glossary.Concept.WebHome]](%%) associated to the [[Measure>>doc:Glossary.Measure.WebHome]](s) in the MeasureDescriptor of the DataStructureDefinition. Each //Observation// associates one or more //ObservationValue//s with a KeyValue (+observationDimension) which is the value for the “[[Dimension>>doc:Glossary.Dimension.WebHome]] at the Observation Level”. Any [[Dimension>>doc:Glossary.Dimension.WebHome]] can be specified as being the “[[Dimension>>doc:Glossary.Dimension.WebHome]] at the Observation Level”, and this specification is made at the level of the //[[DataSet>>doc:Glossary.Data set.WebHome]]// (i.e., it must be the same [[Dimension>>doc:Glossary.Dimension.WebHome]] for the entire //[[DataSet>>doc:Glossary.Data set.WebHome]]//).
++The //[[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]]// can be the [[value>>doc:IMElements.value.WebHome]](s) of the variable(s) being measured for the [[Concept>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.Item.Concept.WebHome]] associated to the Measure(s) in the [[MeasureDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.MeasureDescriptor.WebHome]] of the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]. Each //[[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]]// associates one or more //[[ObservationValue>>doc:IMElements.AnnotableArtefact.ObservationValue.WebHome]]//s with a [[KeyValue>>doc:IMElements.KeyValue.WebHome]] (+[[observationDimension>>doc:IMElements.observationDimension.WebHome]]) which is the [[value>>doc:IMElements.value.WebHome]] for the “[[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] at the [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]] Level”. Any [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] can be specified as being the “[[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] at the [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]] Level”, and this specification is made at the level of the //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]// (i.e., it must be the same [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] for the entire //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]//).
--The //KeyValue// is a value for one of TimeDimension or [[Dimension>>doc:Glossary.Dimension.WebHome]] specified in the DataStructureDefinition. If it is a [[Dimension>>doc:Glossary.Dimension.WebHome]], it can be coded (CodedKeyValue) or uncoded (UncodedKeyValue). If it is the TimeDimension then it is a TimeKeyValue. The actual value that the CodedDimensionValue can take must be one of the [[Codes>>doc:Glossary.Code.WebHome]] in the Codelist specified as the [[Representation>>doc:Glossary.Representation.WebHome]] of the [[Dimension>>doc:Glossary.Dimension.WebHome]] in the DataStructureDefinition.
++The //[[KeyValue>>doc:IMElements.KeyValue.WebHome]]// is a [[value>>doc:IMElements.value.WebHome]] for one of [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]] or [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] specified in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]. If it is a [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]], it can be coded ([[CodedKeyValue>>doc:IMElements.KeyValue.CodedKeyValue.WebHome]]) or uncoded ([[UncodedKeyValue>>doc:IMElements.KeyValue.UncodedKeyValue.WebHome]]). If it is the [[TimeDimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.TimeDimension.WebHome]] then it is a [[TimeKeyValue>>doc:IMElements.KeyValue.TimeKeyValue.WebHome]]. The actual [[value>>doc:IMElements.value.WebHome]] that the CodedDimensionValue can take must be one of the Codes in the [[Codelist>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] specified as the [[Representation>>doc:IMElements.Representation.WebHome]] of the [[Dimension>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.Component.DimensionComponent.Dimension.WebHome]] in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]].
--An ObservationValue can be coded – this is the CodedObservation – or it can be uncoded – this is the UncodedObservation. In the case of uncoded observations, the values may be multilingual – expressed via the TextMeasureValue – or not (OtherUncodedMeasureValue).
++An [[ObservationValue>>doc:IMElements.AnnotableArtefact.ObservationValue.WebHome]] can be coded – this is the [[CodedObservation>>doc:IMElements.AnnotableArtefact.ObservationValue.CodedObservation.WebHome]] – or it can be uncoded – this is the UncodedObservation. In the case of uncoded observations, the values may be multilingual – expressed via the [[TextMeasureValue>>doc:IMElements.AnnotableArtefact.ObservationValue.UncodedObservationValue.TextMeasureValue.WebHome]] – or not ([[OtherUncodedMeasureValue>>doc:IMElements.AnnotableArtefact.ObservationValue.UncodedObservationValue.OtherUncodedMeasureValue.WebHome]]).
--The GroupKey is a subunit of the //Key// that has the same dimensionality as the SeriesKey but defines a subset of the KeyValues of the SeriesKey. Its sub [[dimension>>doc:Glossary.Dimension.WebHome]] structure is defined in the GroupDimensionDescriptor of the DataStructureDefinition identified by the same id as the GroupKey. The id identifies a “type” of group and the purpose of the GroupKey is to report one or more //AttributeValue// that are contained at this group level. The GroupKey is present when the GroupDimensionDescriptor is related to the GroupRelationship in the DataStructureDefinition. There can be many types of groups in a //[[DataSet>>doc:Glossary.Data set.WebHome]]//. If the Group is related to the DimensionRelationship in the DataStructureDefinition then the //AttributeValue// will be reported with the appropriate [[dimension>>doc:Glossary.Dimension.WebHome]] in the SeriesKey or Observation.
++The [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]] is a subunit of the //[[Key>>doc:IMElements.AnnotableArtefact.Key.WebHome]]// that has the same dimensionality as the [[SeriesKey>>doc:IMElements.AnnotableArtefact.Key.SeriesKey.WebHome]] but defines a subset of the KeyValues of the [[SeriesKey>>doc:IMElements.AnnotableArtefact.Key.SeriesKey.WebHome]]. Its sub dimension [[structure>>doc:IMElements.structure.WebHome]] is defined in the [[GroupDimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.GroupDimensionDescriptor.WebHome]] of the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] identified by the same [[id>>doc:IMElements.id.WebHome]] as the [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]]. The [[id>>doc:IMElements.id.WebHome]] identifies a “[[type>>doc:IMElements.type.WebHome]]” of group and the purpose of the [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]] is to report one or more //[[AttributeValue>>doc:IMElements.AnnotableArtefact.AttributeValue.WebHome]]// that are contained at this group level. The [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]] is present when the [[GroupDimensionDescriptor>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.ComponentList.GroupDimensionDescriptor.WebHome]] is related to the [[GroupRelationship>>doc:IMElements.AttributeRelationship.GroupRelationship.WebHome]] in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]]. There can be many types of groups in a //[[DataSet>>doc:sdmx:Glossary 2\.1.Data set.WebHome]]//. If the Group is related to the [[DimensionRelationship>>doc:IMElements.AttributeRelationship.DimensionRelationship.WebHome]] in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] then the //[[AttributeValue>>doc:IMElements.AnnotableArtefact.AttributeValue.WebHome]]// will be reported with the appropriate dimension in the [[SeriesKey>>doc:IMElements.AnnotableArtefact.Key.SeriesKey.WebHome]] or [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]].
--In this way each of SeriesKey, GroupKey, and Observation can have zero or more //AttributeValue//s that define some metadata about the object to which it is associated. The //AttributeValue// may be either a //DataAttributeValue// or a //MetadataAttributeValue//, representing values of DataAttributes defined in the [[DSD>>doc:Glossary.Data structure definition.WebHome]] or MetadataAttributes of the linked [[MSD>>doc:Glossary.Metadata structure definition.WebHome]], respectively. The allowable (% style="color:#e74c3c" %)[[Concepts>>doc:Glossary.Concept.WebHome]](%%) and the objects to which these metadata can be associated (attached) are defined in the DataStructureDefinition and the linked MetadataStructureDefinition.
++In this way each of [[SeriesKey>>doc:IMElements.AnnotableArtefact.Key.SeriesKey.WebHome]], [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]], and [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]] can have zero or more //[[AttributeValue>>doc:IMElements.AnnotableArtefact.AttributeValue.WebHome]]//s that define some [[metadata>>doc:IMElements.metadata.WebHome]] about the object to which it is associated. The //[[AttributeValue>>doc:IMElements.AnnotableArtefact.AttributeValue.WebHome]]// may be either a //[[DataAttributeValue>>doc:IMElements.AnnotableArtefact.AttributeValue.DataAttributeValue.WebHome]]// or a //[[MetadataAttributeValue>>doc:IMElements.AnnotableArtefact.AttributeValue.MetadataAttributeValue.WebHome]]//, representing values of DataAttributes defined in the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] or MetadataAttributes of the linked [[MSD>>doc:sdmx:Glossary 2\.1.Metadata structure definition.WebHome]], respectively. The allowable Concepts and the objects to which these [[metadata>>doc:IMElements.metadata.WebHome]] can be associated (attached) are defined in the [[DataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.DataStructureDefinition.WebHome]] and the linked [[MetadataStructureDefinition>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.MetadataStructureDefinition.WebHome]].
--The //AttributeValue// links to the object type (SeriesKey, GroupKey, Observation) to which it is associated.
++The //[[AttributeValue>>doc:IMElements.AnnotableArtefact.AttributeValue.WebHome]]// links to the object [[type>>doc:IMElements.type.WebHome]] ([[SeriesKey>>doc:IMElements.AnnotableArtefact.Key.SeriesKey.WebHome]], [[GroupKey>>doc:IMElements.AnnotableArtefact.Key.GroupKey.WebHome]], [[Observation>>doc:IMElements.AnnotableArtefact.Observation.WebHome]]) to which it is associated.
  ==== 5.4.3.2 Definitions ====