Changes for page Part IV. Data and Reference Metadata Namespaces

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

From 3.2 to 3.3 From 3.10 to 3.11

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edited by Helena
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@@ -379,45 +379,45 @@
  **Schema:** Refers to the format specific schema in general, and in particular the root xs:schema element of that schema file.
--**Global Element:** Refers to an element definition at the top level of the schema (i.e. an xs:element element in the root xs:schema element). It will define a name and type (name and type attributes) and possibly a substitution group (substitutionGroup attribute).
++**Global Element:** Refers to an element definition at the top (% style="color:#e74c3c" %)level(%%) of the schema (i.e. an xs:element element in the root xs:schema element). It will define a name and type (name and type [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]) and possibly a substitution group (substitutionGroup [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
--**Local Element:** Refers to an element definition within a complex type (i.e. an xs:element element contained within a xs:sequence element that is contained in a xs:complexType element). A local element must define a name and type (name and type attributes) and may also specify a minimum and maximum occurrence (minOccurs and maxOccurs attribute).
++**Local Element:** Refers to an element definition within a complex type (i.e. an xs:element element contained within a xs:sequence element that is contained in a xs:complexType element). A local element must define a name and type (name and type [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]) and may also specify a minimum and maximum occurrence (minOccurs and maxOccurs [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
  **Qualified/Unqualified Element:** A qualified element is an element that must be referred to by the namespace in which it was defined. An unqualified element does not have a namespace associated with it. The structure-specific schemas make use of unqualified elements to that the structure-specific schemas can restrict the base content to meet the specific needs of the structure, while maintaining as much of the original document structure as possible.
--**Element Reference:** Refers to an element definition within a complex type that is a reference to a global element (i.e. an xs:element element contained within a xs:sequence element that is contained in a xs:complexType element). An element reference must reference a global element (via its ref attribute) and may also specify a minimum and maximum occurrence (minOccurs and maxOccurs attribute).
++**Element Reference:** Refers to an element definition within a complex type that is a reference to a global element (i.e. an xs:element element contained within a xs:sequence element that is contained in a xs:complexType element). An element reference must reference a global element (via its ref [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]) and may also specify a minimum and maximum occurrence (minOccurs and maxOccurs [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
--**Complex Type:** Refers to a complex type definition. In this context, all complex type definitions occur at the top level of the schema (i.e. an xs:complexType element in the root xs:schema element). A complex type must define a name (name attribute) and may be made abstract (via the abstract attribute’s boolean value).
++**Complex Type:** Refers to a complex type definition. In this context, all complex type definitions occur at the top (% style="color:#e74c3c" %)level(%%) of the schema (i.e. an xs:complexType element in the root xs:schema element). A complex type must define a name (name [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]) and may be made abstract (via the abstract [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]’s boolean value).
--**Simple Type:** Refers to a simple type definition. In this context, all simple type definitions occur at the top level of the schema (i.e. an xs:simpleType element in the root xs:schema element). In this context, a simple type will always be defined via a restriction (an xs:restriction element in the xs:simpleType element). The restriction will reference a base type.
++**Simple Type:** Refers to a simple type definition. In this context, all simple type definitions occur at the top (% style="color:#e74c3c" %)level(%%) of the schema (i.e. an xs:simpleType element in the root xs:schema element). In this context, a simple type will always be defined via a restriction (an xs:restriction element in the xs:simpleType element). The restriction will reference a base type.
  **Anonymous Type:** A complex or simple type definition which occurs within an element definition. The method is sometimes referred to a the "Russian-doll" technique as it creates nested constructs. Anonymous types are not given names and cannot be abstract. The can however, be derived from other types.
  **Content Group:** A group which defines a content model for reuse. This is contained in the xs:group element and is defined at the root of the schema. It allows for a common sequence or choice of elements to be reused across multiple types without having to redefine the sequence or choice in each type.
--**Uniqueness Constraint:** A uniqueness constraint is defined within an element and is used to force descendent elements to be unique based on some criteria of it fields (elements or attributes). This is defined in an \<xs:unique\> element and has content of an \<xs:selector\> and multiple \<xs:field\> elements. The selector designates the descendants that must be unique (with an xpath attribute) and the field specifies which property of the selected element must be unique (also with an xpath attribute)
++**Uniqueness (% style="color:#e74c3c" %)Constraint(%%):** A uniqueness (% style="color:#e74c3c" %)constraint(%%) is defined within an element and is used to force descendent elements to be unique based on some criteria of it fields (elements or [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]). This is defined in an \<xs:unique\> element and has content of an \<xs:selector\> and multiple \<xs:field\> elements. The selector designates the descendants that must be unique (with an xpath [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]) and the field specifies which property of the selected element must be unique (also with an xpath [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]])
--**Extension:** Refers to the definition of a complex type that is an extension of another complex type. The extension will always make a reference to a base. In the schema, this is defined within the xs:complexType element as a child xs:complexContent element containing an xs:extension element (with a base attribute).
++**Extension:** Refers to the definition of a complex type that is an extension of another complex type. The extension will always make a reference to a base. In the schema, this is defined within the xs:complexType element as a child xs:complexContent element containing an xs:extension element (with a base [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
--**Restriction:** Refers to the definition of a simple or complex type that is a restriction of another type of the same variety. The restriction will always make a reference to a base. In the schema, this is defined with an xs:restriction element (with a base attribute).
++**Restriction:** Refers to the definition of a simple or complex type that is a restriction of another type of the same variety. The restriction will always make a reference to a base. In the schema, this is defined with an xs:restriction element (with a base [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
--**Sequence:** Refers to a sequence of elements that may be defined as the root of a complex type content model, or as part of the content of a choice or another sequence. This is defined as an xs:sequence element. The sequence may specify a minimum and maximum occurrence (minOccurs and maxOccurs attribute).
++**Sequence:** Refers to a sequence of elements that may be defined as the root of a complex type content model, or as part of the content of a choice or another sequence. This is defined as an xs:sequence element. The sequence may specify a minimum and maximum occurrence (minOccurs and maxOccurs [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
--**Choice:** Refers to a choice of elements that may be defined as the root of a complex type content model, or as part of the content of a sequence or another choice. This is defined as an xs:choice element. The sequence may specify a minimum and maximum occurrence (minOccurs and maxOccurs attribute).
++**Choice:** Refers to a choice of elements that may be defined as the root of a complex type content model, or as part of the content of a sequence or another choice. This is defined as an xs:choice element. The sequence may specify a minimum and maximum occurrence (minOccurs and maxOccurs [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
--**Facet:** Refers to a single detail of a simple type restriction. This is represented by elements such as xs:minInclusive, xs:totalDigits, xs:minLength, and is contained in the xs:restriction element of a simple type definition. The value of the facet is contained in a value attribute of the particular element.
++**[[Facet>>doc:sdmx:Glossary.Facet.WebHome]]:** Refers to a single detail of a simple type restriction. This is represented by elements such as xs:minInclusive, xs:totalDigits, xs:minLength, and is contained in the xs:restriction element of a simple type definition. The value of the [[facet>>doc:sdmx:Glossary.Facet.WebHome]] is contained in a value [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] of the particular element.
--**Enumeration:** Refers to an enumerated value of a simple type definition. It is represented by an xs:enumeration element contained within an xs:restriction element of a simple type definition. An enumeration defines a value (in the value attribute) and documentation (in xs:documentation elements contained in an xs:annotation element).
++**Enumeration:** Refers to an enumerated value of a simple type definition. It is represented by an xs:enumeration element contained within an xs:restriction element of a simple type definition. An enumeration defines a value (in the value [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]) and documentation (in xs:documentation elements contained in an xs:[[annotation>>doc:sdmx:Glossary.Annotation.WebHome]] element).
--**XML Attribute:** Refers to the definition of an XML attribute for a complex type (i.e. and xs:attribute element in a xs:complexType element). An attribute must define a name and type (name and type attributes) and may also specify a usage (use attribute).
++**XML [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]:** Refers to the definition of an XML [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] for a complex type (i.e. and xs:[[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] element in a xs:complexType element). An [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] must define a name and type (name and type [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]]) and may also specify a usage (use [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]).
  == 3.2 Namespace Rules ==
--Each format specific schema will specify its namespace in the target namespace of the schema (the targetNamespace attribute of the schema). This document also assumes that the root namespace (that which is defined by the xmlns attribute) of the schema will be the same as the target namespace. Therefore, any types or global elements referenced in these descriptions without a namespace prefix are assumed to be in the format specific namespace.
++Each format specific schema will specify its namespace in the target namespace of the schema (the targetNamespace [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] of the schema). This document also assumes that the root namespace (that which is defined by the xmlns [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]]) of the schema will be the same as the target namespace. Therefore, any types or global elements referenced in these descriptions without a namespace prefix are assumed to be in the format specific namespace.
  The format specific schemas will incorporate the core format namespace and the common namespace by importing the schemas (via the xs:import element). If necessary, additional namespaces may be imported and referenced.
--For the purpose of the descriptions here, the default element form for the schema (as specified in the elementFormDefault attribute of the schema) is "qualified", and the default attribute form (as specified in the attributeFormDefault attribute of the schema) is "unqualified".
++For the purpose of the descriptions here, the default element form for the schema (as specified in the elementFormDefault [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] of the schema) is "qualified", and the default [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] form (as specified in the attributeFormDefault [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] of the schema) is "unqualified".
  == 3.3 General Rules ==
@@ -425,57 +425,56 @@
  === 3.3.1 Component Name Determination ===
--When required to create an XML element or attribute, the name for a component is always its identifier. However, the identifier may be inherited. Therefore, the general rules are as follows:
++When required to create an XML element or [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]], the name for a [[component>>doc:sdmx:Glossary.Component.WebHome]] is always its identifier. However, the identifier may be inherited. Therefore, the general rules are as follows:
--1. If the component defines an identifier, the element or attribute name is the value of that identifier
--2. Otherwise, the element or attribute name is the identifier of the concept from which it takes its semantic (Note that this is technically the component identifier).
++1. If the [[component>>doc:sdmx:Glossary.Component.WebHome]] defines an identifier, the element or [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] name is the value of that identifier
++2. Otherwise, the element or [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] name is the identifier of the (% style="color:#e74c3c" %)concept(%%) from which it takes its semantic (Note that this is technically the [[component>>doc:sdmx:Glossary.Component.WebHome]] identifier).
  === 3.3.2 Representation Determination ===
--Every component has a representation associated with it, whether it is defined as a local representation in the component definition, or it is inherited from the concept from which the component takes it semantic (as defined in the concept identity of the component).
++Every [[component>>doc:sdmx:Glossary.Component.WebHome]] has a [[representation>>doc:sdmx:Glossary.Representation.WebHome]] associated with it, whether it is defined as a local [[representation>>doc:sdmx:Glossary.Representation.WebHome]] in the [[component>>doc:sdmx:Glossary.Component.WebHome]] definition, or it is inherited from the (% style="color:#e74c3c" %)concept(%%) from which the [[component>>doc:sdmx:Glossary.Component.WebHome]] takes it semantic (as defined in the (% style="color:#e74c3c" %)concept(%%) identity of the [[component>>doc:sdmx:Glossary.Component.WebHome]]).
--The representation of a component is determined by the following precedence:
++The [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of a [[component>>doc:sdmx:Glossary.Component.WebHome]] is determined by the following precedence:
--1. The local representation defined by the component
--1. The core representation defined in the concept from which the component takes its semantic
--1. A default representation of an un-faceted text format with a data type of String.
++1. The local [[representation>>doc:sdmx:Glossary.Representation.WebHome]] defined by the [[component>>doc:sdmx:Glossary.Component.WebHome]]
++1. The core [[representation>>doc:sdmx:Glossary.Representation.WebHome]] defined in the (% style="color:#e74c3c" %)concept(%%) from which the [[component>>doc:sdmx:Glossary.Component.WebHome]] takes its semantic
++1. A default [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of an un-faceted text format with a data type of String.
--The representation will either define a text format, an enumeration with an enumeration format, or a union of the former with the value of a irrelevant representation ‘’ (tilde).
++The [[representation>>doc:sdmx:Glossary.Representation.WebHome]] will either define a text format, an enumeration with an enumeration format, or a union of the former with the value of a irrelevant [[representation>>doc:sdmx:Glossary.Representation.WebHome]] ‘’ (tilde).
--A text format consists of a data type and an optional collection of facets. It is the combination of these which determine the exact nature of the component representation. An enumeration consists of a reference to a codelist, hierarchy, or value list, for which an enumerated list of possible values can be created.
++A text format consists of a data type and an optional collection of [[facets>>doc:sdmx:Glossary.Facet.WebHome]]. It is the combination of these which determine the exact nature of the [[component>>doc:sdmx:Glossary.Component.WebHome]] [[representation>>doc:sdmx:Glossary.Representation.WebHome]]. An enumeration consists of a reference to a [[codelist>>doc:sdmx:Glossary.Code list.WebHome]], [[hierarchy>>doc:sdmx:Glossary.Hierarchy.WebHome]], or value list, for which an enumerated list of possible values can be created.
  === 3.3.3 Simple / Primitive Type Determination ===
--For any given representation, there exist rules for determining the simple or primitive type which should be used to validate the value. There are no specific requirements to how a simple type is named or if it is referenced or used as an anonymous type. This section simply serves to state the requirements of the type for a component based on its [determined representation](#332-Representation-Determination).
++For any given [[representation>>doc:sdmx:Glossary.Representation.WebHome]], there exist rules for determining the simple or primitive type which should be used to validate the value. There are no specific requirements to how a simple type is named or if it is referenced or used as an anonymous type. This section simply serves to state the requirements of the type for a [[component>>doc:sdmx:Glossary.Component.WebHome]] based on its [determined [[representation>>doc:sdmx:Glossary.Representation.WebHome]]](#332-[[Representation>>doc:sdmx:Glossary.Representation.WebHome]]-Determination).
--For example, a dimension may inherit its representation for a concept, and the data type of a representation data type may be a String. The simplest solution would be to use the xs:string primitive type. However, an implementer may have chosen to generate simple types for all concepts to avoid having to look up the concept core representation for very component. In this case, the type may be given a name based on the concept and be a simple derivation from the xs:string type that places no further restrictions. The result would be that the type that is actually used for the dimension, although named after the concept, is effectively the required xs:string. These rules are meant to allow such flexibility in how types are created. The only requirement is that the type meet the requirements stated here.
++For example, a [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] may inherit its [[representation>>doc:sdmx:Glossary.Representation.WebHome]] for a (% style="color:#e74c3c" %)concept(%%), and the data type of a [[representation>>doc:sdmx:Glossary.Representation.WebHome]] data type may be a String. The simplest solution would be to use the xs:string primitive type. However, an implementer may have chosen to generate simple types for all (% style="color:#e74c3c" %)concepts(%%) to avoid having to look up the (% style="color:#e74c3c" %)concept(%%) core [[representation>>doc:sdmx:Glossary.Representation.WebHome]] for very [[component>>doc:sdmx:Glossary.Component.WebHome]]. In this case, the type may be given a name based on the (% style="color:#e74c3c" %)concept(%%) and be a simple derivation from the xs:string type that places no further restrictions. The result would be that the type that is actually used for the [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]], although named after the (% style="color:#e74c3c" %)concept(%%), is effectively the required xs:string. These rules are meant to allow such flexibility in how types are created. The only requirement is that the type meet the requirements stated here.
  === 3.3.4 Representation with Codelist Enumeration ===
--A representation which defines an enumeration from a codelist or hierarchy will result in a simple type that is a restriction of the common:IDType. The simple type will define enumerations for each code in the codelist or hierarchy, accounting for extensions. The value for these enumerations will be identifier of the item. If desired, the names of the item may be placed in the documentation of the enumeration, but this is not required. Example:
++A [[representation>>doc:sdmx:Glossary.Representation.WebHome]] which defines an enumeration from a [[codelist>>doc:sdmx:Glossary.Code list.WebHome]] or [[hierarchy>>doc:sdmx:Glossary.Hierarchy.WebHome]] will result in a simple type that is a restriction of the common:IDType. The simple type will define enumerations for each [[code>>doc:sdmx:Glossary.Code.WebHome]] in the [[codelist>>doc:sdmx:Glossary.Code list.WebHome]] or [[hierarchy>>doc:sdmx:Glossary.Hierarchy.WebHome]], accounting for extensions. The value for these enumerations will be identifier of the item. If desired, the names of the item may be placed in the documentation of the enumeration, but this is not required. Example:
--xml
--   <xs:simpleType name="ESTAT.CL\_COUNTRY.1.0">
--      <xs:restriction base="common:IDType">
--         <xs:enumeration value="BE">
--            <xs:annotation>
--               <xs:documentation xml:lang="en">Belgium</xs:documentation>
--            </xs:annotation>
--         </xs:enumeration>
++>  <xs:simpleType name="ESTAT.CL\_COUNTRY.1.0">
++>     <xs:restriction base="common:IDType">
++>        <xs:enumeration value="BE">
++>           <xs:annotation>
++>              <xs:documentation xml:lang="en">Belgium</xs:documentation>
++>           </xs:annotation>
++>        </xs:enumeration>
  === 3.3.5 Representation with Value List Enumeration ===
--A representation which defines an enumeration from a value list will result in a simple type that is a restriction of the xs:string data type. The simple type will define enumerations for each value item in the value list. The value for these enumerations will be identifier of the item. If desired, the names of the item may be placed in the documentation of the enumeration, but this is not required.
++A [[representation>>doc:sdmx:Glossary.Representation.WebHome]] which defines an enumeration from a value list will result in a simple type that is a restriction of the xs:string data type. The simple type will define enumerations for each value item in the value list. The value for these enumerations will be identifier of the item. If desired, the names of the item may be placed in the documentation of the enumeration, but this is not required.
  === 3.3.6 Representation with Simple Text Format ===
--A representation which defines a simple text format will result in a simple type or primitive type. The representation is simple if none of the following conditions are true:
++A [[representation>>doc:sdmx:Glossary.Representation.WebHome]] which defines a simple text format will result in a simple type or primitive type. The [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is simple if none of the following conditions are true:
--* representation max occurs is greater than 1
++* [[representation>>doc:sdmx:Glossary.Representation.WebHome]] max occurs is greater than 1
  * text format data type is XHMTL
  * text format is multi-lingual
--If the representation is not simple, see the rules in the following section for complex text formats. If the representation is simple, the first step is to determine the base type from the text format data type:
++If the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is not simple, see the rules in the following section for complex text formats. If the [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is simple, the first step is to determine the base type from the text format data type:
  (% style="width:679.294px" %)
  |(% style="width:286px" %)**SDMX Data Type**|(% style="width:390px" %)**XML Schema Data Type**
@@ -521,7 +521,7 @@
  |(% style="width:286px" %)GeospatialInformation|(% style="width:390px" %)xs:string
  |(% style="width:286px" %)XHTML|(% style="width:390px" %)See the following section for complex representations
--If the text format does not specify any further facets, then the determined type is the listed type or a type which derives from the listed type without placing any addition restrictions on it. However, if one or more facets are specified, then a simple type based on the listed type is necessary. The simple type derives via restriction from the listed type and adds facets according to the following table (the values are mapped as is):
++If the text format does not specify any further [[facets>>doc:sdmx:Glossary.Facet.WebHome]], then the determined type is the listed type or a type which derives from the listed type without placing any addition restrictions on it. However, if one or more [[facets>>doc:sdmx:Glossary.Facet.WebHome]] are specified, then a simple type based on the listed type is necessary. The simple type derives via restriction from the listed type and adds [[facets>>doc:sdmx:Glossary.Facet.WebHome]] according to the following table (the values are (% style="color:#e74c3c" %)mapped(%%) as is):
  (% style="width:1007.29px" %)
  |(% style="width:267px" %)**SDMX Facet**|(% style="width:729px" %)**XML Schema Facet**
@@ -532,37 +532,34 @@
  |(% style="width:267px" %)decimals^^1^^|(% style="width:729px" %)xs:fractionDigits
  |(% style="width:267px" %)pattern|(% style="width:729px" %)xs:pattern
--Any other facets are informational only and will not affect the determined type.
++Any other [[facets>>doc:sdmx:Glossary.Facet.WebHome]] are informational only and will not affect the determined type.
  === 3.3.7 Representation for Not Applicable Dimensions ===
--Not applicable dimensions, i.e., when reported measures or attributes are not attached to those dimensions, take as value the tilde ‘’ character. This is required for datasets defined by a DSD that has the ‘evolving structure’ property set to true and that includes data from dataflows, which only use a subset of dimensions as defined by a dimension constraint. This is also required for data-related higher-level (i.e., attached to dataflow or partial list of Dimensions) reference metadata attributes that don’t have a fixed pre-defined attachment.
++Not applicable [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]], i.e., when reported [[measures>>doc:sdmx:Glossary.Measure.WebHome]] or [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] are not attached to those [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]], take as value the tilde ‘’ character. This is required for [[datasets>>doc:sdmx:Glossary.Data set.WebHome]] defined by a [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] that has the ‘evolving structure’ property set to true and that includes data from [[dataflows>>doc:sdmx:Glossary.Dataflow.WebHome]], which only use a subset of [[dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] as defined by a [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)constraint(%%). This is also required for data-related higher-(% style="color:#e74c3c" %)level(%%) (i.e., attached to [[dataflow>>doc:sdmx:Glossary.Dataflow.WebHome]] or partial list of [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]]) [[reference metadata>>doc:sdmx:Glossary.Reference metadata.WebHome]] [[attributes>>doc:sdmx:Glossary.Attribute.WebHome]] that don’t have a fixed pre-defined attachment.
--To support a specific type and allow for a not applicable dimension value, the structure-specific schema must union the type with the common:NotApplicableType, which enumerates the tilde ‘’ character. This is as shown in the following example:
++To support a specific type and allow for a not applicable [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]] value, the structure-specific schema must union the type with the common:NotApplicableType, which enumerates the tilde ‘’ character. This is as shown in the following example:
--xml
--   <xs:simpleType name="DecimalOrNotApplicableType">
--      <xs:union memberTypes="xs:decimal common:NotApplicableType"/>
--   </xs:simpleType>
++>  <xs:simpleType name="DecimalOrNotApplicableType">
++>     <xs:union memberTypes="xs:decimal common:NotApplicableType"/>
++>  </xs:simpleType>
  For enumerated types, the generated structure-specific schema can include the special value in the enumeration or create a union between the enumerated type and the common:NotApplicableType.
  Option 1: Augmenting the enumeration with the special value
--xml
--   <xs:simpleType name="CL\_SUBINDICATOR\_OR\_NOT\_APPLICABLE">
--      <xs:union memberTypes="CL\_SUBINDICATOR common:NotApplicableType"/>
--   </xs:simpleType>
++>  <xs:simpleType name="CL\_SUBINDICATOR\_OR\_NOT\_APPLICABLE">
++>     <xs:union memberTypes="CL\_SUBINDICATOR common:NotApplicableType"/>
++>  </xs:simpleType>
  Option 2: Extending the enumeration with the special value
--xml
--   <xs:simpleType name="CL\_ SUBINDICATOR ">
--      <xs:restriction base="xs:string">
--         <xs:enumeration value="A"/>
--         <xs:enumeration value=""/>
--      <xs:restriction>
--   </xs:simpleType>
++>  <xs:simpleType name="CL\_ SUBINDICATOR ">
++>     <xs:restriction base="xs:string">
++>        <xs:enumeration value="A"/>
++>        <xs:enumeration value=""/>
++>     <xs:restriction>
++>  </xs:simpleType>
  For convenience the common schema provides the union types for the following data types.
@@ -599,38 +599,35 @@
  === 3.3.8 Representation for Intentionally Missing Measure and Attribute Values ===
--For intentionally missing measure and attribute values, even if mandatory, the following special values can be used:
++For intentionally missing [[measure>>doc:sdmx:Glossary.Measure.WebHome]] and [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] values, even if mandatory, the following special values can be used:
  * NaN for all numeric types (float, double)
  * #N/A for all other types
--To support a specific type and allow for an intentionally missing measure or attribute value, the structure-specific schema must union the type with the common:MissingType, which enumerates the #N/A string. Note that XML natively already supports NaN for float and double values.
++To support a specific type and allow for an intentionally missing [[measure>>doc:sdmx:Glossary.Measure.WebHome]] or [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value, the structure-specific schema must union the type with the common:MissingType, which enumerates the #N/A string. Note that XML natively already supports NaN for float and double values.
  This union is as shown in the following example:
--xml
--   <xs:simpleType name="DecimalOrMissingType">
--      <xs:union memberTypes="xs:decimal common:MissingType"/>
--   </xs:simpleType>
++>   <xs:simpleType name="DecimalOrMissingType">
++>      <xs:union memberTypes="xs:decimal common:MissingType"/>
++>   </xs:simpleType>
  For enumerated types, the generated structure-specific schema can include the special value in the enumeration or create a union between the enumerated type and the common:MissingType.
  Option 1: Augmenting the enumeration with the special value
--xml
--   <xs:simpleType name="CL\_SUBINDICATOR\_OR\_NOT\_APPLICABLE">
--      <xs:union memberTypes="CL\_SUBINDICATOR common:MissingType"/>
--   </xs:simpleType>
++ >  <xs:simpleType name="CL\_SUBINDICATOR\_OR\_NOT\_APPLICABLE">
++ >     <xs:union memberTypes="CL\_SUBINDICATOR common:MissingType"/>
++ >  </xs:simpleType>
  Option 2: Extending the enumeration with the special value
--xml
--   <xs:simpleType name="CL\_ SUBINDICATOR ">
--      <xs:restriction base="xs:string">
--         <xs:enumeration value="A"/>
--         <xs:enumeration value="#N/A"/>
--      <xs:restriction>
--   </xs:simpleType>
++>   <xs:simpleType name="CL\_ SUBINDICATOR ">
++>      <xs:restriction base="xs:string">
++>         <xs:enumeration value="A"/>
++>         <xs:enumeration value="#N/A"/>
++>      <xs:restriction>
++>   </xs:simpleType>
  For convenience the common schema provides the union types for the following data types.
@@ -667,34 +667,34 @@
  === 3.3.9 Representation with Complex Text Format ===
--A representation which defines a complex text format will result in a complex type. The representation is complex if any of the following conditions are true:
++A [[representation>>doc:sdmx:Glossary.Representation.WebHome]] which defines a complex text format will result in a complex type. The [[representation>>doc:sdmx:Glossary.Representation.WebHome]] is complex if any of the following conditions are true:
--* representation max occurs is greater than 1
++* [[representation>>doc:sdmx:Glossary.Representation.WebHome]] max occurs is greater than 1
  * text format data type is XHMTL
  * text format is multi-lingual
  The resulting complex type will be derived via restriction of the common:ValueType. In simple cases, there are pre-defined types that can be used:
--* if the text format data type is XHTML, common:StructuredTextValueType can be used; note that this type cannot be further restricted – all other facets are ignored
--* if the text format is multi-lingual, common:TextValueType can be used; note that this type cannot be further restricted – all other facets are ignored
--* if the text format has no additional facets and the data type is:
--  + Boolean, common:BooleanValueType can be used
--  + String, common:StringValueType can be used
--  + Integer, common:IntValueType can be used
--  + Double, common:DoubleValueType can be used
--  + ObservationalTimePeriod, common:ObservationalTimePeriodValueType can be used
++* if the text format data type is XHTML, common:StructuredTextValueType can be used; note that this type cannot be further restricted – all other [[facets>>doc:sdmx:Glossary.Facet.WebHome]] are ignored
++* if the text format is multi-lingual, common:TextValueType can be used; note that this type cannot be further restricted – all other [[facets>>doc:sdmx:Glossary.Facet.WebHome]] are ignored
++* if the text format has no additional [[facets>>doc:sdmx:Glossary.Facet.WebHome]] and the data type is:
++** Boolean, common:BooleanValueType can be used
++** String, common:StringValueType can be used
++** Integer, common:IntValueType can be used
++** Double, common:DoubleValueType can be used
++** ObservationalTimePeriod, common:ObservationalTimePeriodValueType can be used
--If a pre-defined type cannot be used, one will have to be created. The complex type must define a simple content restriction of the common:ValueType. The restriction should define an anonymous simple type based on the text format data type and facets as described in the previous section.
++If a pre-defined type cannot be used, one will have to be created. The complex type must define a simple content restriction of the common:ValueType. The restriction should define an anonymous simple type based on the text format data type and [[facets>>doc:sdmx:Glossary.Facet.WebHome]] as described in the previous section.
  === 3.3.10 Type Names ===
  These rules will only dictate type names where absolutely necessary. In all other cases, it is the decision of the implementer as to how to name or use the type. It is also the implementer's requirement to ensure that any type name is properly unique within its scope. To assist in this, the following recommendations are offered for naming types such that they are unique.
--* It the type is an enumeration from an item scheme, the recommended name is [Item Scheme Class].[Maintenance Agency].[Item Scheme ID].[Item Scheme Version]
--* If the type is based on a text format of a concept core representation, the recommended name is Concept.[Maintenance Agency].[Concept Scheme ID].[Concept Scheme Version].[Concept ID]
--* If the type is based on a text format of a component local representation, and;
--  + The component id is required to be unique for all components within the scope of the structure which defines it (e.g. a dimension), the recommended name is [Component ID]
--  + The component id is only required to be unique within the component list and which defines it (e.g. a metadata attribute), the recommend name is [Component List ID].[Parent Component ID]\*.[Component ID]
++* It the type is an enumeration from an [[item scheme>>doc:sdmx:Glossary.Item scheme.WebHome]], the recommended name is ~[[[Item Scheme>>doc:sdmx:Glossary.Item scheme.WebHome]] Class].[Maintenance Agency].~[[[Item Scheme>>doc:sdmx:Glossary.Item scheme.WebHome]] ID].~[[[Item Scheme>>doc:sdmx:Glossary.Item scheme.WebHome]] Version]
++* If the type is based on a text format of a (% style="color:#e74c3c" %)concept(%%) core [[representation>>doc:sdmx:Glossary.Representation.WebHome]], the recommended name is (% style="color:#e74c3c" %)Concept(%%).[Maintenance Agency].[(% style="color:#e74c3c" %)Concept(%%) Scheme ID].[(% style="color:#e74c3c" %)Concept(%%) Scheme Version].[(% style="color:#e74c3c" %)Concept(%%) ID]
++* If the type is based on a text format of a [[component>>doc:sdmx:Glossary.Component.WebHome]] local [[representation>>doc:sdmx:Glossary.Representation.WebHome]], and;
++** The [[component>>doc:sdmx:Glossary.Component.WebHome]] id is required to be unique for all [[components>>doc:sdmx:Glossary.Component.WebHome]] within the scope of the structure which defines it (e.g. a [[dimension>>doc:sdmx:Glossary.Dimension.WebHome]]), the recommended name is ~[[[Component>>doc:sdmx:Glossary.Component.WebHome]] ID]
++** The [[component>>doc:sdmx:Glossary.Component.WebHome]] id is only required to be unique within the [[component>>doc:sdmx:Glossary.Component.WebHome]] list and which defines it (e.g. a metadata attribute), the recommend name is [Component List ID].[Parent Component ID]\*.[Component ID]
  === 3.3.11 Type Reuse ===