Interoperability Basis Platform

== {{id name="_Toc371062"/}}10.1 Scope ==

The scope of this section is to describe the support in the metamodel for specifying both the access to and the content of a [[data source>>doc:sdmx:Glossary.Data source.WebHome]]. The information may be stored in a resource such as a registry for use by applications wishing to locate data and metadata which is available via the Internet. The [[Constraint>>doc:Glossary.Constraint.WebHome]] is also used to specify a sub set of a Codelist which may used as a partial [[code list>>doc:sdmx:Glossary.Code list.WebHome]] which is relevant in the context of the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] to which the [[Constraint>>doc:Glossary.Constraint.WebHome]] is attached e.g. [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]], [[Dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]], Provision Agreement.

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Note that in this metamodel the term [[data source>>doc:sdmx:Glossary.Data source.WebHome]] refers to both data and metadata sources, and [[data provider>>doc:sdmx:Glossary.Data provider.WebHome]] refers to both data and metadata providers.

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A [[data source>>doc:sdmx:Glossary.Data source.WebHome]] may be a simple file of data or metadata (in [[SDMX-ML>>doc:sdmx:Glossary.SDMX-ML.WebHome]] format), or a database or [[metadata repository>>doc:sdmx:Glossary.Metadata repository.WebHome]]. A [[data source>>doc:sdmx:Glossary.Data source.WebHome]] may contain data for many data or [[metadataflows>>doc:sdmx:Glossary.Metadataflow.WebHome]] (called DataflowDefinition, and MetadataflowDefinition in the model), and the mechanisms described in this section allow an organisation to specify precisely the scope of the content of the [[data source>>doc:sdmx:Glossary.Data source.WebHome]] where this [[data source>>doc:sdmx:Glossary.Data source.WebHome]] is registered (SimpleDataSource, QueryDataSource).

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The DataflowDefinition and MetadataflowDefinition, themselves may be specified as containing only a sub set of all the possible keys that could be derived from a DataStructureDefinition or MetadataStructureDefinition.

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These specifications are called //[[Constraint>>doc:Glossary.Constraint.WebHome]]// in this model.

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== {{id name="_Toc371063"/}}10.2 Inheritance ==

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=== {{id name="_Toc371064"/}}10.2.1 Class Diagram of Constrainable Artefacts - Inheritance ===

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[[image:1747904390682-586.png]]

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**Figure 37: Inheritance class diagram of constrainable and provisioning artefacts**

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=== {{id name="_Toc371065"/}}10.2.2 Explanation of the Diagram ===

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==== 10.2.2.1 Narrative ====

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Any [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] that is derived from //ConstrainableArtefact// can have [[constraints>>doc:Glossary.Constraint.WebHome]] defined. The [[artefacts>>doc:sdmx:Glossary.Artefact.WebHome]] that can have [[constraint>>doc:Glossary.Constraint.WebHome]] metadata attached are:

* DataflowDefinition

* ProvisionAgreement

* DataProvider – this is restricted to [[release calendar>>doc:sdmx:Glossary.Release policy - release calendar.WebHome]]

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* MetadataflowDefinition

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* DataStructureDefinition

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* MetadataStructureDefinition

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* [[DataSet>>doc:sdmx:Glossary.Data set.WebHome]]

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* SimpleDataSource – this is a registered [[data source>>doc:sdmx:Glossary.Data source.WebHome]] where the registration references the actual [[DataSet>>doc:sdmx:Glossary.Data set.WebHome]] or MetadataSet

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* QueryDataSource

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Note that, because the [[Constraint>>doc:Glossary.Constraint.WebHome]] can specify a sub set of the [[component>>doc:sdmx:Glossary.Component.WebHome]] values implied by a specific //Structure// (such a specific DataStructureDefinition or specific MetadataStructureDefinition), the //ConstrainableArtefact//s must be associated with a specific //Structure//. Therefore, whilst the [[Constraint>>doc:Glossary.Constraint.WebHome]] itself may not be linked directly to a DataStructureDefinition or MetadataStructureDefinition, the [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] that it is constraining will be linked to a DataStructureDefinition or MetadataStructureDefinition. As a [[Data Provider>>doc:sdmx:Glossary.Data provider.WebHome]] does not link to any one specific [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] or [[MSD>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] the type of information that can be contained in a [[Constraint>>doc:Glossary.Constraint.WebHome]] linked to a DataProvider is restricted to [[Release Calendar>>doc:sdmx:Glossary.Release policy - release calendar.WebHome]].

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== {{id name="_Toc371066"/}}10.3 Constraints ==

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=== {{id name="_Toc371067"/}}10.3.1 Relationship Class Diagram – high level view ===

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[[image:1747904434659-835.png]]

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**Figure 38: Relationship class diagram showing constraint metadata**

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=== {{id name="_Toc371068"/}}10.3.2 Explanation of the Diagram ===

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==== 10.3.2.1 Narrative ====

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The constraint mechanism allows specific [[constraints>>doc:Glossary.Constraint.WebHome]] to be attached to a //ConstrainableArtefact//. With the exception of ReferencePeriod, and ReleaseCalendar these [[constraints>>doc:Glossary.Constraint.WebHome]] specify a sub set of the total set of values or keys that may be present in any of the ConstrainableArtefacts.

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For instance a DataStructureDefinition specifies, for each [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], the list of allowable [[code>>doc:sdmx:Glossary.Code.WebHome]] values. However, a specific DataflowDefinition that uses the DataStructureDefinition may contain only a sub set of the possible range of keys that is theoretically possible from the DataStructureDefinition definition (the total range of possibilities is sometimes called the Cartesian product of the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] values). In addition to this, a DataProvider that is capable of supplying data according to the DataflowDefinition has a ProvisionAgreement, and the DataProvider may also wish to supply [[constraint>>doc:Glossary.Constraint.WebHome]] information which may further constrain the range of possibilities in order to describe the data that the provider can supply. It may also be useful to describe the content of a datasource in terms of the KeySets or CubeRegions contained within it.

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A //ConstrainableArtefact// can have two types of //[[Constraint>>doc:Glossary.Constraint.WebHome]]//:

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1. ContentConstraint – is used solely as a mechanism to specify either the available set of keys (DataKeySet, MetadataKeySet) or set of [[component>>doc:sdmx:Glossary.Component.WebHome]] values (CubeRegion, MetadatTargetRegion) in a //DataSource// such as a [[DataSet>>doc:sdmx:Glossary.Data set.WebHome]] or a database (//QueryDatasource//), or the allowable keys that can be constructed from a DataStructureDefinition. Multiple such [[constraints>>doc:Glossary.Constraint.WebHome]] may be present for a //ConstrainableArtefact//. For instance, there may be a ContentConstraint that specifies the values allowed for the //ConstrainableArtefact //(role is allowableContent) which can be used for validation or for constructing a partial [[code list>>doc:sdmx:Glossary.Code list.WebHome]], whilst another [[constraint>>doc:Glossary.Constraint.WebHome]] can specify the actual content of a data or metadata source (role is actualContent).

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1. AttachmentConstraint – is used as a mechanism to define slices of the full set of data and to which metadata can be attached in a [[Data Set>>doc:sdmx:Glossary.Data set.WebHome]] or MetadataSet. These slices can be defined either as a set of keys (KeySet) or a set of [[component>>doc:sdmx:Glossary.Component.WebHome]] values (CubeRegion). There can be many AttachmentConstraints specified for a specific AttachableArtefact.

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In addition to (DataKeySet, MetadataKeySet, CubeRegion, MetadataTargetRegion, a [[Constraint>>doc:Glossary.Constraint.WebHome]] can have a ReferencePeriod defining one of more date ranges (ValidityPeriod) specifying the [[time period>>doc:sdmx:Glossary.Time period.WebHome]] for which data or metadata are available in the //ConstrainableArtefact// and a ReleaseCalendar specifying when data are released for publication or reporting.

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=== {{id name="_Toc371069"/}}10.3.3 Relationship Class Diagram – Detail ===

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[[image:1747904480223-768.png]]

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**Figure 39: Constraints - Key Set Constraints**

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[[image:1747904523939-355.png]]

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**Figure 40: Constraints - Cube Region and Metadata Target Region Constraints**

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==== 10.3.3.1 Explanation of the Diagram ====

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A //[[Constraint>>doc:Glossary.Constraint.WebHome]]// is a //MaintainableArtefact//.

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A //[[Constraint>>doc:Glossary.Constraint.WebHome]]// has a choice of two ways of specifying value sub sets:

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1. As a set of keys that can be present in the [[DataSet>>doc:sdmx:Glossary.Data set.WebHome]] (DataKeySet) or MetadataSet (MetadataKeySet). Each DataKey or MetadataKey specifies a number of ComponentValues each of which reference a //[[Component>>doc:sdmx:Glossary.Component.WebHome]]// (e.g. [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]], TargetObject). Each ComponentValue is a value that may be present for a //[[Component>>doc:sdmx:Glossary.Component.WebHome]]// of a structure when contained in a [[DataSet>>doc:sdmx:Glossary.Data set.WebHome]] or MetadataSet. The MetadataKeySet must also identify the MetadataTarget as there can be many of each of these in a MetadataStructureDefinition. For the DataKeySet the equivalent identification is not necessary as there is only one DimensionDescriptor and one AttributeDescriptor.

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1. As a set of CubeRegions or MetadataTaregetRegions each of which defines a “slice” of the total structure (MemberSelection) in terms of one or more MemberValues that may be present for a //[[Component>>doc:sdmx:Glossary.Component.WebHome]]// of a structure when contained in a //[[DataSet>>doc:sdmx:Glossary.Data set.WebHome]]// or MetadataSet.

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The difference between (1) and (2) above is that in (1) a complete key is defined whereas in (2) above the “slice” defines a list of possible values for each of the// [[Component>>doc:sdmx:Glossary.Component.WebHome]]//s but does not specify specific key combinations. In addition, in (1) the association between //[[Component>>doc:sdmx:Glossary.Component.WebHome]]// and DataKeyValue or MetadataKeyValue is constrained to the [[components>>doc:sdmx:Glossary.Component.WebHome]] that comprise the key or identifier, whereas in (2) it can contain other [[component>>doc:sdmx:Glossary.Component.WebHome]] types (such as [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]). The value in ComponentValue.value and MemberValue.value must be consistent with the //[[Representation>>doc:sdmx:Glossary.Representation.WebHome]]// declared for the //[[Component>>doc:sdmx:Glossary.Component.WebHome]]// in the DataStructureDefinition or MetadataStructureDefinition. Note that in all cases the “operator” on the value is deemed to be “equals”. Furthermore, it is possible in a MemberValue to specify that child values (e.g. child [[codes>>doc:sdmx:Glossary.Code.WebHome]]) are included in the [[constraint>>doc:Glossary.Constraint.WebHome]] by means of the cascadeValues [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]].

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It is possible to define for the DataKeySet, DataKey, MetadataKeySet, MetadataKey, CubeRegion, MetadataTargetRegion, and MemberSelection whether the set is included (isIncluded = “true”) or excluded (isIncluded = ”false”) from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition. This [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is useful if, for example, only a small sub-set of the possible values are not included in the set, then this smaller sub-set can be defined and excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] . Note that if the child construct is “included: and the parent construct is “excluded” then the child construct is included in the list of constructs that are “excluded”.

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==== 10.3.3.2 Definitions ====

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(% style="width:987.294px" %)

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|**Class**|**Feature**|(% style="width:471px" %)**Description**

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|//Constrainable// //[[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]]//|(((

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Abstract Class Sub classes are:

DataflowDefinition

Metadataflow

Definition

ProvisionAgreement

DataProvider

//QueryDatasource//

SimpleDatasource

DataStructure

Definition

MetadataStructure

Definition

)))|(% style="width:471px" %)An [[artefact>>doc:sdmx:Glossary.Artefact.WebHome]] that can have [[Constraints>>doc:Glossary.Constraint.WebHome]] specified.

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| |content|(% style="width:471px" %)Associates the metadata that constrains the content to be found in a data or metadata source linked to the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]].

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| |attachment|(% style="width:471px" %)Associates the metadata that constrains the valid content of a Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] to which metadata may be attached.

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|//[[Constraint>>doc:Glossary.Constraint.WebHome]]//|(((

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Inherits from

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//MaintainableArtefact//

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Abstract class. Sub classes are:

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AttachmentConstraint

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ContentConstraint

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)))|(% style="width:471px" %)Specifies a sub set of the definition of the allowable or actual content of a data or metadata source that can be derived from the Structure that defines [[code lists>>doc:sdmx:Glossary.Code list.WebHome]] and other valid content.

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| |+availableDates|(% style="width:471px" %)Association to the [[time period>>doc:sdmx:Glossary.Time period.WebHome]] that identifies the time range for which data or metadata are available in the [[data source>>doc:sdmx:Glossary.Data source.WebHome]].

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| |+dataContentKeys|(% style="width:471px" %)Association to a sub set of Data Key Sets (i.e. value combinations) that can be derived from the definition of the structure to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linked.

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| |+metadataContentKeys|(% style="width:471px" %)Association to a sub set of Metdata Key Sets (i.e. value combinations) that can be derived from the definition of the Structure to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linke

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| |+dataContentRegion|(% style="width:471px" %)Association to a sub set of [[component>>doc:sdmx:Glossary.Component.WebHome]] values that can be derived from the [[Data Structure Definition>>doc:sdmx:Glossary.Data structure definition.WebHome]] to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linked.

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| |+metadataContentRegion|(% style="width:471px" %)Association to a sub set of [[component>>doc:sdmx:Glossary.Component.WebHome]] values that can be derived from the [[Metadata Structure Definition>>doc:sdmx:Glossary.Metadata structure definition.WebHome]] to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linked.

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|ContentConstraint|(((

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Inherits from //[[Constraint>>doc:Glossary.Constraint.WebHome]]//

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)))|(% style="width:471px" %)Defines a [[Constraint>>doc:Glossary.Constraint.WebHome]] in terms of the content that can be found in data or metadata sources linked to the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] to which this [[constraint>>doc:Glossary.Constraint.WebHome]] is associated.

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| |+role|(% style="width:471px" %)Association to the role that the [[Constraint>>doc:Glossary.Constraint.WebHome]] plays

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|ConstraintRole| |(% style="width:471px" %)Specifies the way the type of content of a [[Constraint>>doc:Glossary.Constraint.WebHome]] in terms of its purpose.

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| |allowableContent|(% style="width:471px" %)The [[Constraint>>doc:Glossary.Constraint.WebHome]] contains a specification of the valid sub set of the [[Component>>doc:sdmx:Glossary.Component.WebHome]] values or keys.

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| |actualContent|(% style="width:471px" %)The [[Constraint>>doc:Glossary.Constraint.WebHome]] contains a specification of the actual content of a data or metadata source in terms of the [[Component>>doc:sdmx:Glossary.Component.WebHome]] values or keys in the source.

|(((

AttachmentConstraint

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Inherits from //[[Constraint>>doc:Glossary.Constraint.WebHome]]//

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)))|(% style="width:471px" %)Defines a [[Constraint>>doc:Glossary.Constraint.WebHome]] in terms of the combination of [[component>>doc:sdmx:Glossary.Component.WebHome]] values that may be found in a [[data source>>doc:sdmx:Glossary.Data source.WebHome]], and to which a Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] may be associated in a structure definition.

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|DataKeySet| |(% style="width:471px" %)A set of data keys.

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| |isIncluded|(% style="width:471px" %)Indicates whether the Data Key Set is included in the [[constraint>>doc:Glossary.Constraint.WebHome]] definition or excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition.

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| |+keys|(% style="width:471px" %)Association to the Data Keys in the set.

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|MetadataKeySet| |(% style="width:471px" %)A set of metadata keys.

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| |isIncluded|(% style="width:471px" %)Indicates whether the [[Metadata Key Set>>doc:sdmx:Glossary.Metadata key set.WebHome]] is included in the [[constraint>>doc:Glossary.Constraint.WebHome]] definition or excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition.

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| |+keys|(% style="width:471px" %)Association to the Metadata Keys in the set.

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|DataKey| |(% style="width:471px" %)The values of a key in a data set.

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| |isIncluded|(% style="width:471px" %)Indicates whether the Data Key is included in the [[constraint>>doc:Glossary.Constraint.WebHome]] definition or excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition.

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| |+keyValue|(% style="width:471px" %)Associates the [[Component>>doc:sdmx:Glossary.Component.WebHome]] Values that comprise the key.

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|MetadataKey| |(% style="width:471px" %)The values of a key in a metadata set.

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| |isIncluded|(% style="width:471px" %)Indicates whether the Metdadata Key is included in the [[constraint>>doc:Glossary.Constraint.WebHome]] definition or excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition.

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| |+keyValue|(% style="width:471px" %)Associates the [[Component>>doc:sdmx:Glossary.Component.WebHome]] Values that comprise the key.

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|ComponentValue| |(% style="width:471px" %)The identification of and value of a [[Component>>doc:sdmx:Glossary.Component.WebHome]] of the key (e.g. [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]])

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| |value|(% style="width:471px" %)The value of [[Component>>doc:sdmx:Glossary.Component.WebHome]]

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| |+valueFor|(% style="width:471px" %)Association to the [[Component>>doc:sdmx:Glossary.Component.WebHome]] (e.g. [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]]) in the Structure to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linked.

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|TimeDimensionValue| |(% style="width:471px" %)The value of the Time [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] [[component>>doc:sdmx:Glossary.Component.WebHome]].

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| |timeValue|(% style="width:471px" %)The value of the [[time period>>doc:sdmx:Glossary.Time period.WebHome]].

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| |operator|(% style="width:471px" %)(((

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Indicates whether the specified value represents and exact time or [[time period>>doc:sdmx:Glossary.Time period.WebHome]], or whether the value should be handled as a range.

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A value of greaterThan or greaterThanOrEqual indicates that the value is the beginning of a range (exclusive or inclusive, respectively).

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A value of lessThan or lessThanOrEqual indicates that the value is the end or a range (exclusive or inclusive, respectively).

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In the absence of the opposite bound being specified for the range, this bound is to be treated as infinite (e.g. any [[time period>>doc:sdmx:Glossary.Time period.WebHome]] after the beginning of the provided [[time period>>doc:sdmx:Glossary.Time period.WebHome]] for greaterThanOrEqual)

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)))

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|CubeRegion| |(% style="width:471px" %)A set of [[Components>>doc:sdmx:Glossary.Component.WebHome]] and their values that defines a sub set or “slice” of the total range of possible content of a data structure to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linked.

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| |isIncluded|(% style="width:471px" %)Indicates whether the Cube Region is included in the [[constraint>>doc:Glossary.Constraint.WebHome]] definition or excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition.

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| |+member|(% style="width:471px" %)Associates the set of [[Components>>doc:sdmx:Glossary.Component.WebHome]] that define the sub set of values.

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|MetadataTargetRegion| |(% style="width:471px" %)A set of [[Components>>doc:sdmx:Glossary.Component.WebHome]] and their values that defines a sub set or “slice” of the total range of possible content of a metadata structure to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linked.

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| |isIncluded|(% style="width:471px" %)Indicates whether the Metadata Target Region is included in the [[constraint>>doc:Glossary.Constraint.WebHome]] definition or excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition.

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| |+member|(% style="width:471px" %)Associates the set of [[Components>>doc:sdmx:Glossary.Component.WebHome]] that define the sub set of values.

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|MemberSelection| |(% style="width:471px" %)A set of permissible values for one [[component>>doc:sdmx:Glossary.Component.WebHome]] of the axis.

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| |isIncluded|(% style="width:471px" %)Indicates whether the [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] is included in the [[constraint>>doc:Glossary.Constraint.WebHome]] definition or excluded from the [[constraint>>doc:Glossary.Constraint.WebHome]] definition.

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| |+valuesFor|(% style="width:471px" %)Association to the [[Component>>doc:sdmx:Glossary.Component.WebHome]] in the Structure to which the Constrainable [[Artefact>>doc:sdmx:Glossary.Artefact.WebHome]] is linked, which defines the valid [[Representation>>doc:sdmx:Glossary.Representation.WebHome]] for the Member Values.

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|SelectionValue|(((

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Abstract class. Sub classes are:

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MemberValue

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TimeRangeValue

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)))|(% style="width:471px" %)A collection of values for the [[Member Selections>>doc:sdmx:Glossary.Member selection.WebHome]] that, combined with other [[Member Selections>>doc:sdmx:Glossary.Member selection.WebHome]], comprise the value content of the Cube Region.

|MemberValue|(((

Inherits from

SelectionValue

)))|(% style="width:471px" %)A single value of the set of values for the [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]].

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| |value|(% style="width:471px" %)A value of the member.

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| |cascadeValues|(% style="width:471px" %)Indicates that the child nodes of the member are included in the [[Member Selection>>doc:sdmx:Glossary.Member selection.WebHome]] (e.g. child [[codes>>doc:sdmx:Glossary.Code.WebHome]])

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|//TimeRangeValue//|(((

Inherits from

SelectionValue

Abstract Class

Concrete Classes

BeforePeriod

AfterPeriod

RangePeriod

)))|(% style="width:471px" %)A time value or values that specifies the date or dates for which the constrained selection is valid.

|BeforePeriod|(((

Inherits from

//TimeRangeValue//

)))|(% style="width:471px" %)The period before which the constrained selection is valid.

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| |isInclusive|(% style="width:471px" %)Indication of whether the date is inclusive in the period.

|AfterPeriod|(((

Inherits from

//TimeRangeValue//

)))|(% style="width:471px" %)The period after which the constrained selection is valid.

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| |isInclusive|(% style="width:471px" %)Indication of whether the date is inclusive in the period.

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|RangePeriod| |(% style="width:471px" %)The start and end periods in a date range.

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| |+start|(% style="width:471px" %)Association to the Start Period.

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| |+end|(% style="width:471px" %)Association to the End Period.

|StartPeriod|(((

Inherits from

//TimeRangeValue//

)))|(% style="width:471px" %)The period from which the constrained selection is valid.

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| |isInclusive|(% style="width:471px" %)Indication of whether the date is inclusive in the period.

|EndPeriod|(((

Inherits from

//TimeRangeValue//

)))|(% style="width:471px" %)The period to which the constrained selection is valid.

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| |isInclusive|(% style="width:471px" %)Indication of whether the date is inclusive in the period.

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|ReferencePeriod| |(% style="width:471px" %)A set of dates that constrain the content that may be found in a data or metadata set.

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| |startDate|(% style="width:471px" %)The start date of the period.

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| |endDate|(% style="width:471px" %)The end date of the period.

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|ReleaseCalendar| |(% style="width:471px" %)The schedule of publication or reporting of the data or metadata

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| |periodicity|(% style="width:471px" %)The [[time period>>doc:sdmx:Glossary.Time period.WebHome]] between the releases of the data or metadata

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| |offset|(% style="width:471px" %)Interval between January 1^^st^^ and the first release of the data

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| |tolerance|(% style="width:471px" %)Period after which the data or metadata may be deemed late.

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