Changes for page 3 SDMX Base Package

Last modified by Helena on 2025/09/10 11:19

From 6.1 to 6.2 From 6.8 to 6.9

From version 6.2

edited by Helena
on 2025/05/20 00:22

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To version 6.8

edited by Helena
on 2025/05/20 00:29

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@@ -26,10 +26,8 @@
  This group of classes forms the nucleus of the administration facets of SDMX objects. They provide features which are reusable by derived classes to support horizontal functionality such as identity, versioning etc.
--All classes derived from the abstract class //AnnotableArtefact// may have Annotations (or notes): this supports the need to add notes to all SDMX-ML elements. The Annotation is used to convey extra information to describe any SDMX construct. This information may be in the form of a URL reference and/or a multilingual text (represented by the association to
++All classes derived from the abstract class //AnnotableArtefact// may have Annotations (or notes): this supports the need to add notes to all SDMX-ML elements. The Annotation is used to convey extra information to describe any SDMX construct. This information may be in the form of a URL reference and/or a multilingual text (represented by the association to InternationalString).
--InternationalString).
--
  The //IdentifiableArtefact// is an abstract class that comprises the basic attributes needed for identification. Concrete classes based on //IdentifiableArtefact// all inherit the ability to be uniquely identified.
  The //NamableArtefact// is an abstract class that inherits from //IdentifiableArtefact //and in addition the +description and +name roles support multilingual descriptions and names for all objects based on //NameableArtefact//. The InternationalString supports the representation of a description in multiple locales (locale is similar to language but includes geographic variations such as Canadian French, US English etc.). The //LocalisedString// supports the representation of a description in one locale.
@@ -40,70 +40,62 @@
  The inheritance chain from //AnnotableArtefact// through to //MaintainableArtefact// allows SDMX classes to inherit the features they need, from simple annotation, through identity, naming, to versioning and maintenance.
--**3.2.2.2 Definitions**
++==== 3.2.2.2 Definitions ====
--|**Class**|**Feature**|**Description**
--|//AnnotableArtefact//|(((
++(% style="width:902.294px" %)
++|**Class**|(% style="width:246px" %)**Feature**|(% style="width:480px" %)**Description**
++|//AnnotableArtefact//|(% style="width:246px" %)(((
  Base inheritance sub classes are:
--
  //IdentifiableArtefact//
--)))|Objects of classes derived from this can have attached annotations.
--|Annotation| |Additional descriptive information attached to an object.
--| |id|(((
++)))|(% style="width:480px" %)Objects of classes derived from this can have attached annotations.
++|Annotation|(% style="width:246px" %) |(% style="width:480px" %)Additional descriptive information attached to an object.
++| |(% style="width:246px" %)id|(% style="width:480px" %)(((
  Identifier for the Annotation.
--
  It can be used to disambiguate one Annotation from another where there are several Annotations for the same annotated object.
  )))
--| |title// &nbsp;&nbsp;&nbsp;//|A title used to identify an annotation.
--| |type|Specifies how the annotation is to be processed.
--| |url|A link to external descriptive text.
--| |+text|An International String provides the multilingual text content of the annotation via this role.
--|//IdentifiableArtefact//|(((
++| |(% style="width:246px" %)title|(% style="width:480px" %)A title used to identify an annotation.
++| |(% style="width:246px" %)type|(% style="width:480px" %)Specifies how the annotation is to be processed.
++| |(% style="width:246px" %)url|(% style="width:480px" %)A link to external descriptive text.
++| |(% style="width:246px" %)+text|(% style="width:480px" %)An International String provides the multilingual text content of the annotation via this role.
++|//IdentifiableArtefact//|(% style="width:246px" %)(((
  Superclass is
--
  //AnnotableArtefact//
--
--Base inheritance sub classes are~:// &nbsp;&nbsp;&nbsp;//
--
++Base inheritance sub classes are:
  //NameableArtefact//
--)))|Provides identity to all derived classes. It also provides annotations to derived classes because it is a subclass of Annotable Artefact.
--| |id|The unique identifier of the object.
--| |uri|Universal resource identifier that may or may not be resolvable.
--| |urn|Universal resource name – this is for use in registries: all registered objects have a urn.
--|//NameableArtefact//|(((
++)))|(% style="width:480px" %)Provides identity to all derived classes. It also provides annotations to derived classes because it is a subclass of Annotable Artefact.
++| |(% style="width:246px" %)id|(% style="width:480px" %)The unique identifier of the object.
++| |(% style="width:246px" %)uri|(% style="width:480px" %)Universal resource identifier that may or may not be resolvable.
++| |(% style="width:246px" %)urn|(% style="width:480px" %)Universal resource name – this is for use in registries: all registered objects have a urn.
++|//NameableArtefact//|(% style="width:246px" %)(((
  Superclass is
--
  //IdentifiableArtefact// Base inheritance sub classes are:
--
  //VersionableArtefact//
--)))|Provides a Name and Description to all derived classes in addition to identification and annotations.
--| |+description|A multi-lingual description is provided by this role via the International String class.
--| |+name|A multi-lingual name is provided by this role via the International String class
--|InternationalString| |The International String is a collection of Localised Strings and supports the representation of text in multiple locales.
--|LocalisedString| |The Localised String supports the representation of text in one locale (locale is similar to language but includes geographic variations such as Canadian French, US English etc.).
--| |label|Label of the string.
--| |locale|The geographic locale of the string e.g French, Canadian French.
--|//VersionableArtefact//|(((
++)))|(% style="width:480px" %)Provides a Name and Description to all derived classes in addition to identification and annotations.
++| |(% style="width:246px" %)+description|(% style="width:480px" %)A multi-lingual description is provided by this role via the International String class.
++| |(% style="width:246px" %)+name|(% style="width:480px" %)A multi-lingual name is provided by this role via the International String class
++|InternationalString|(% style="width:246px" %) |(% style="width:480px" %)The International String is a collection of Localised Strings and supports the representation of text in multiple locales.
++|LocalisedString|(% style="width:246px" %) |(% style="width:480px" %)The Localised String supports the representation of text in one locale (locale is similar to language but includes geographic variations such as Canadian French, US English etc.).
++| |(% style="width:246px" %)label|(% style="width:480px" %)Label of the string.
++| |(% style="width:246px" %)locale|(% style="width:480px" %)The geographic locale of the string e.g French, Canadian French.
++|//VersionableArtefact//|(% style="width:246px" %)(((
  Superclass is
--
  //NameableArtefact// Base inheritance sub classes are:
--
  //MaintainableArtefact//
--)))|Provides versioning information for all derived objects.
--| |version|A version string following an agreed convention
--| |validFrom|Date from which the version is valid
--| |validTo|Date from which version is superceded
--|//MaintainableArtefact//|(((
++)))|(% style="width:480px" %)Provides versioning information for all derived objects.
++| |(% style="width:246px" %)version|(% style="width:480px" %)A version string following an agreed convention
++| |(% style="width:246px" %)validFrom|(% style="width:480px" %)Date from which the version is valid
++| |(% style="width:246px" %)validTo|(% style="width:480px" %)Date from which version is superceded
++|//MaintainableArtefact//|(% style="width:246px" %)(((
  Inherits from
  //VersionableArtefact//
--)))|An abstract class to group together primary structural metadata artefacts that are maintained by an Agency.
--| |final|Defines whether a maintained artefact is draft or final.
--| |isExternalReference|If set to “true” it indicates that the content of the object is held externally.
--| |structureURL|The URL of an SDMX-ML document containing the external object.
--| |serviceURL|The URL of an SDMX-compliant web service from which the external object can be retrieved.
--| |+maintainer// &nbsp;&nbsp;&nbsp;//|Association to the Maintenance Agency responsible for maintaining the artefact.
--|Agency| |See section on “Organisations”
++)))|(% style="width:480px" %)An abstract class to group together primary structural metadata artefacts that are maintained by an Agency.
++| |(% style="width:246px" %)final|(% style="width:480px" %)Defines whether a maintained artefact is draft or final.
++| |(% style="width:246px" %)isExternalReference|(% style="width:480px" %)If set to “true” it indicates that the content of the object is held externally.
++| |(% style="width:246px" %)structureURL|(% style="width:480px" %)The URL of an SDMX-ML document containing the external object.
++| |(% style="width:246px" %)serviceURL|(% style="width:480px" %)The URL of an SDMX-compliant web service from which the external object can be retrieved.
++| |(% style="width:246px" %)+maintainer|(% style="width:480px" %)Association to the Maintenance Agency responsible for maintaining the artefact.
++|Agency|(% style="width:246px" %) |(% style="width:480px" %)See section on “Organisations”
  == {{id name="_Toc370972"/}}3.3 Basic Inheritance ==
@@ -169,7 +169,8 @@
  [[image:SDMX_2-1_SECTION_2_InformationModel_2020-07_a2879920.jpg||height="602" width="614"]]
--====== Figure 12 The Item Scheme Pattern ======
++(% class="wikigeneratedid" id="HFigure12TheItemSchemePattern" %)
++**Figure 12 The Item Scheme Pattern**
  ===== {{id name="_Toc370981"/}}3.5.3 Explanation of the Diagram =====
@@ -195,73 +195,47 @@
  ==== 3.5.3.2 Definitions ====
--|**Class**|**Feature**|**Description**
--|//ItemScheme//|(((
++(% style="width:911.294px" %)
++|**Class**|(% style="width:246px" %)**Feature**|(% style="width:478px" %)**Description**
++|//ItemScheme//|(% style="width:246px" %)(((
  Inherits from:
--
  //MaintainableArtefact//
--
  Direct sub classes are:
--
  CategoryScheme
--
  ConceptScheme
--
  Codelist
--)))|The descriptive information for an arrangement or division of objects into groups based on characteristics, which the objects have in common.
--| |(((
++)))|(% style="width:478px" %)The descriptive information for an arrangement or division of objects into groups based on characteristics, which the objects have in common.
++| |(% style="width:246px" %)(((
  ReportingTaxonomy
--
  //OrganisationScheme//
--
  Transformation Scheme
--
  CustomTypeScheme
--
  NamePersonasationScheme
--
  RuletScheme
--
  VtlMappingScheme
--
  UserDefinedOperatorScheme
--)))|
--| |isPartial|Denotes whether the Item Scheme contains a sub set of the full set of Items in the maintained scheme.
--| |items|Association to the Items in the scheme.
--|//Item//|(((
++)))|(% style="width:478px" %)
++| |(% style="width:246px" %)isPartial|(% style="width:478px" %)Denotes whether the Item Scheme contains a sub set of the full set of Items in the maintained scheme.
++| |(% style="width:246px" %)items|(% style="width:478px" %)Association to the Items in the scheme.
++|//Item//|(% style="width:246px" %)(((
  Inherits from:
--
  //NameableArtefact//
--
--Direct sub classes are
--
--Category
--
++Direct sub classes are Category
  Concept
--
  Code
--
  ReportingCategory
--
  //Organisation//
--
  Transformation
--
  CustomType
--
  NamePersonlisation
--
  Ruleset
--
  VtlMapping
--
--UserDefinedOperator// &nbsp;&nbsp;&nbsp;//
--)))|(((
++UserDefinedOperator
++)))|(% style="width:478px" %)(((
  The Item is an item of content in an Item Scheme. This may be a node in a taxonomy or ontology, a code in a code list etc.
--
  Note that at the conceptual level the Organisation is not hierarchic
  )))
--| |hierarchy|This allows an Item optionally to have one or more child Items.
++| |(% style="width:246px" %)hierarchy|(% style="width:478px" %)This allows an Item optionally to have one or more child Items.
  == {{id name="_Toc370982"/}}3.6 The Structure Pattern ==
@@ -277,7 +277,8 @@
  [[image:SDMX_2-1_SECTION_2_InformationModel_2020-07_b6478a73.png||height="774" width="556"]]
--====== Figure 14: Representation within the Structure Pattern ======
++(% class="wikigeneratedid" id="HFigure14:RepresentationwithintheStructurePattern" %)
++**Figure 14: Representation within the Structure Pattern**
  === {{id name="_Toc370985"/}}3.6.3 Explanation of the Diagrams ===
@@ -301,7 +301,7 @@
  __ReportStructure__: MetadataAttribute
--Each Component takes its semantic (and possibly also its representation) from a Concept in 773 a ConceptScheme. This is represented by the conceptIdentity association to Concept.
++Each Component takes its semantic (and possibly also its representation) from a Concept in a ConceptScheme. This is represented by the conceptIdentity association to Concept.
  The //Component// may also have a localRepresentation, This allows a concrete class, such as Dimension, to specify its representation which is local to the //Structure// in which it is contained (for Dimension this will be DataStructureDefinition), and thus overrides any coreRepresentation specified for the Concept.
@@ -316,126 +316,98 @@
  The //Structure// may be used by one or more //StructureUsage//. An example of this in terms of concrete classes is that a DataflowDefinition (sub class of //StructureUsage//) may use a particular DataStructureDefinition (sub class of //Structure//), and similar constructs apply for the MetadataflowDefinition (link to MetadataStructureDefinition).
--**3.6.3.2 Definitions**
++==== 3.6.3.2 Definitions ====
--|**Class**|**Feature**|**Description**
++(% style="width:1001.29px" %)
++|**Class**|**Feature**|(% style="width:537px" %)**Description**
  |//StructureUsage//|(((
  Inherits from:
--
  //MaintainableArtefact//
--
  Sub classes are:
--
  DataflowDefinition
--
--MetadataflowDefinition// &nbsp;&nbsp;&nbsp;//
--)))|An artefact whose components are described by a Structure. In concrete terms (sub-classes) an example would be a Dataflow Definition which is linked to a given structure – in this case the Data Structure Definition.
--| |structure|An association to a Structure specifying the structure of the artefact.
++MetadataflowDefinition
++)))|(% style="width:537px" %)An artefact whose components are described by a Structure. In concrete terms (sub-classes) an example would be a Dataflow Definition which is linked to a given structure – in this case the Data Structure Definition.
++| |structure|(% style="width:537px" %)An association to a Structure specifying the structure of the artefact.
  |//Structure//|(((
  Inherits from:
--
  //MaintainableArtefact//
--
  Sub classes are:
--
  DataStructure
--
  Definition
--
  MetadataStructure
--
  Definition
--)))|Abstract specification of a list of lists to define a complex tabular structure. A concrete example of this would be statistical concepts, code lists, and their organisation in a data or metadata structure definition, defined by a centre institution, usually for the exchange of statistical information with its partners.
--| |grouping|A composite association to one or more component lists.
++)))|(% style="width:537px" %)Abstract specification of a list of lists to define a complex tabular structure. A concrete example of this would be statistical concepts, code lists, and their organisation in a data or metadata structure definition, defined by a centre institution, usually for the exchange of statistical information with its partners.
++| |grouping|(% style="width:537px" %)A composite association to one or more component lists.
  |//ComponentList//|(((
  Inherits from:
--
  //IdentifiableArtefact//
--
  Sub classes are:
--
  DimensionDescriptor
--
  GroupDimension
--
  Descriptor
--
  MeasureDescriptor
--
  AttributeDescriptor
--
  MetadataTarget
--
  ReportStructure
--)))|An abstract definition of a list of components. A concrete example is a Dimension Descriptor which defines the list of Dimensions in a Data Structure Definition.
--| |components|An aggregate association to one or more components which make up the list.
++)))|(% style="width:537px" %)An abstract definition of a list of components. A concrete example is a Dimension Descriptor which defines the list of Dimensions in a Data Structure Definition.
++| |components|(% style="width:537px" %)An aggregate association to one or more components which make up the list.
  |//Component//|(((
  Inherits from:
--
  //IdentifiableArtefact//
--
  Sub classes are:
--
  PrimaryMeasure
--
  DataAttribute
--
--//DimensionComponent//
--
--//TargetObject//
--
++//DimensionComponent
++TargetObject//
  MetadataAttribute
--)))|A component is an abstract super class used to define qualitative and quantitative data and metadata items that belong to a Component List and hence a Structure. Component is refined through its sub-classes.
--| |conceptIdentity|Association to a Concept in a Concept Scheme that identifies and defines the semantic of the Component
--| |localRepresentation|Association to the Representation of the Component if this is different from the coreRepresentation of the Concept which the Component uses (ConceptUsage)
--|Representation| |The allowable value or format for Component or Concept
--| |+enumerated|Association to an enumerated list that contains the allowable content for the Component when reported in a data or metadata set. The type of enumerated list that is allowed for any concrete Component is shown in the constraints on the association (e.g. Identifier Component can have any of the sub classes of Item Scheme, whereas Measure Dimension must have a Concept Scheme).
--| |+nonEnumerated|Association to a set of Facets that define the allowable format for the content of the Component when reported in a data or metadata set.
--|Facet| |Defines the format for the content of the Component when reported in a data or metadata set.
--| |facetType|A specific content type which is constrained by the FacetType enumeration
--| |facetValueType|(((
++)))|(% style="width:537px" %)A component is an abstract super class used to define qualitative and quantitative data and metadata items that belong to a Component List and hence a Structure. Component is refined through its sub-classes.
++| |conceptIdentity|(% style="width:537px" %)Association to a Concept in a Concept Scheme that identifies and defines the semantic of the Component
++| |localRepresentation|(% style="width:537px" %)Association to the Representation of the Component if this is different from the coreRepresentation of the Concept which the Component uses (ConceptUsage)
++|Representation| |(% style="width:537px" %)The allowable value or format for Component or Concept
++| |+enumerated|(% style="width:537px" %)Association to an enumerated list that contains the allowable content for the Component when reported in a data or metadata set. The type of enumerated list that is allowed for any concrete Component is shown in the constraints on the association (e.g. Identifier Component can have any of the sub classes of Item Scheme, whereas Measure Dimension must have a Concept Scheme).
++| |+nonEnumerated|(% style="width:537px" %)Association to a set of Facets that define the allowable format for the content of the Component when reported in a data or metadata set.
++|Facet| |(% style="width:537px" %)Defines the format for the content of the Component when reported in a data or metadata set.
++| |facetType|(% style="width:537px" %)A specific content type which is constrained by the FacetType enumeration
++| |facetValueType|(% style="width:537px" %)(((
  The format of the value of a Component when reported in a data or metadata set.
  This is contrained by the FacetValueType enumeration.
  )))
--| |+itemSchemeFacet|Defines the format of the identifiers in an Item Scheme used by a Component. Typically this would define the number of characters (length) of the identifier.
--|ExtendedFacet| |This has the same function as Facet but allows additionally an XHTML representation. This is constrained for use with a Metadata Attribute
++| |+itemSchemeFacet|(% style="width:537px" %)Defines the format of the identifiers in an Item Scheme used by a Component. Typically this would define the number of characters (length) of the identifier.
++|ExtendedFacet| |(% style="width:537px" %)This has the same function as Facet but allows additionally an XHTML representation. This is constrained for use with a Metadata Attribute
--The specification of the content and use of the sub classes to ,,ComponentList,, and ,,Component,, can be found in the section in which they are used (DataStructureDefinition and MetadataStructureDefinition)
++The specification of the content and use of the sub classes to ComponentList and Component can be found in the section in which they are used (DataStructureDefinition and MetadataStructureDefinition)
  ==== 3.6.3.3 Representation Constructs ====
  The majority of SDMX FacetValueTypes are compatible with those found in XML Schema, 818 and have equivalents in most current implementation platforms:
--:
--
  (((
--|**SDMX Facet Value Type**|**XML Schema Data Type &nbsp;&nbsp;&nbsp;&nbsp;**|**.NET Framework Type**|**Java Data Type**
--|String|xsd:string|System.String|java.lang.String
--|Big Integer|xsd:integer|System.Decimal|java.math.BigInteger
--|Integer|xsd:int|System.Int32|int
--|Long|xsd.long|System.Int64|long
--|Short|xsd:short|System.Int16|short
--|Decimal|xsd:decimal|System.Decimal|java.math.BigDecimal
--|Float|xsd:float|System.Single|float
--|Double|xsd:double|System.Double|double
--|Boolean|xsd:boolean|System.Boolean|boolean
--|URI|xsd:anyURI|System.Uri|Java.net.URI or java.lang.String
--|DateTime|xsd:dateTime|System.DateTime|javax.xml.datatype.XMLG regorianCalendar
--|Time|xsd:time|System.DateTime|javax.xml.datatype.XMLG regorianCalendar
--|GregorianYear|xsd:gYear|System.DateTime|javax.xml.datatype.XMLG regorianCalendar
--|GregorianMonth|xsd:gYearMonth|System.DateTime|javax.xml.datatype.XMLG regorianCalendar
--|GregorianDay|xsd:date|System.DateTime|javax.xml.datatype.XMLG regorianCalendar
--|Day, MonthDay, Month|xsd:g*|System.DateTime|javax.xml.datatype.XMLG regorianCalendar
--|Duration|xsd:duration|System.TimeSpan|javax.xml.datatype.Dura tion
++(% style="width:1034.29px" %)
++|(% style="width:222px" %)**SDMX Facet Value Type**|(% style="width:229px" %)**XML Schema Data Type**|(% style="width:216px" %)**.NET Framework Type**|(% style="width:354px" %)**Java Data Type**
++|(% style="width:222px" %)String|(% style="width:229px" %)xsd:string|(% style="width:216px" %)System.String|(% style="width:354px" %)java.lang.String
++|(% style="width:222px" %)Big Integer|(% style="width:229px" %)xsd:integer|(% style="width:216px" %)System.Decimal|(% style="width:354px" %)java.math.BigInteger
++|(% style="width:222px" %)Integer|(% style="width:229px" %)xsd:int|(% style="width:216px" %)System.Int32|(% style="width:354px" %)int
++|(% style="width:222px" %)Long|(% style="width:229px" %)xsd.long|(% style="width:216px" %)System.Int64|(% style="width:354px" %)long
++|(% style="width:222px" %)Short|(% style="width:229px" %)xsd:short|(% style="width:216px" %)System.Int16|(% style="width:354px" %)short
++|(% style="width:222px" %)Decimal|(% style="width:229px" %)xsd:decimal|(% style="width:216px" %)System.Decimal|(% style="width:354px" %)java.math.BigDecimal
++|(% style="width:222px" %)Float|(% style="width:229px" %)xsd:float|(% style="width:216px" %)System.Single|(% style="width:354px" %)float
++|(% style="width:222px" %)Double|(% style="width:229px" %)xsd:double|(% style="width:216px" %)System.Double|(% style="width:354px" %)double
++|(% style="width:222px" %)Boolean|(% style="width:229px" %)xsd:boolean|(% style="width:216px" %)System.Boolean|(% style="width:354px" %)boolean
++|(% style="width:222px" %)URI|(% style="width:229px" %)xsd:anyURI|(% style="width:216px" %)System.Uri|(% style="width:354px" %)Java.net.URI or java.lang.String
++|(% style="width:222px" %)DateTime|(% style="width:229px" %)xsd:dateTime|(% style="width:216px" %)System.DateTime|(% style="width:354px" %)javax.xml.datatype.XMLG regorianCalendar
++|(% style="width:222px" %)Time|(% style="width:229px" %)xsd:time|(% style="width:216px" %)System.DateTime|(% style="width:354px" %)javax.xml.datatype.XMLG regorianCalendar
++|(% style="width:222px" %)GregorianYear|(% style="width:229px" %)xsd:gYear|(% style="width:216px" %)System.DateTime|(% style="width:354px" %)javax.xml.datatype.XMLG regorianCalendar
++|(% style="width:222px" %)GregorianMonth|(% style="width:229px" %)xsd:gYearMonth|(% style="width:216px" %)System.DateTime|(% style="width:354px" %)javax.xml.datatype.XMLG regorianCalendar
++|(% style="width:222px" %)GregorianDay|(% style="width:229px" %)xsd:date|(% style="width:216px" %)System.DateTime|(% style="width:354px" %)javax.xml.datatype.XMLG regorianCalendar
++|(% style="width:222px" %)Day, MonthDay, Month|(% style="width:229px" %)xsd:g*|(% style="width:216px" %)System.DateTime|(% style="width:354px" %)javax.xml.datatype.XMLG regorianCalendar
++|(% style="width:222px" %)Duration|(% style="width:229px" %)xsd:duration|(% style="width:216px" %)System.TimeSpan|(% style="width:354px" %)javax.xml.datatype.Dura tion
  )))
--There are also a number of SDMX data types which do not have these direct 822 correspondences, often because they are composite representations or restrictions of a 823 broader data type. These are detailed in Section 6 of the standards.
++There are also a number of SDMX data types which do not have these direct correspondences, often because they are composite representations or restrictions of a broader data type. These are detailed in Section 6 of the standards.
--The ,,Representation,, is composed of ,,Facet,,s, each of which conveys characteristic 826 information related to the definition of a value domain. Often a set of Facets are needed to 827 convey the required semantic. For example, a sequence is defined by a minimum of two 828 Facets: one to define the start value, and one to define the interval.
++The Representation is composed of Facets, each of which conveys characteristic information related to the definition of a value domain. Often a set of Facets are needed to convey the required semantic. For example, a sequence is defined by a minimum of two Facets: one to define the start value, and one to define the interval.
--:
--
  (((
  |**Facet Type**|**Explanation**|
  |isSequence|The isSequence facet indicates whether the values are intended to be ordered, and it may work in combination with the interval, startValue, and endValue facet or the timeInterval, startTime, and endTime, facets. If this attribute holds a value of true, a start value or time and a numeric or time interval must supplied. If an end value is not given, then the sequence continues indefinitely.|