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4 4  
5 5  == 7.1 Context ==
6 6  
7 -Besides the possibility to extend the [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]] of [[Data Structure Definitions>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] by metadata [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] defined in [[Metadata Structure Definitions>>doc:sdmx:Glossary 2\.1.Metadata structure definition.WebHome]], the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] metamodel allows metadata to describe any [[identifiable artefact>>doc:sdmx:Glossary 2\.1.Identifiable artefact.WebHome]]. These metadata can be:
7 +Besides the possibility to extend the components of Data Structure Definitions by metadata attributes defined in Metadata Structure Definitions, the SDMX metamodel allows metadata to describe any identifiable artefact. These metadata can be:
8 8  
9 9  1. Exchanged without the need to embed it within the object that it is describing.
10 -1. Stored separately from the object that it describes, yet be linked to it (for example, an organisation has a [[metadata repository>>doc:sdmx:Glossary 2\.1.Metadata repository.WebHome]] which supports the dissemination of metadata resulting from metadata requests generated by systems or services that have access to the object for which the metadata pertains. This is common in web dissemination where additional metadata is available for viewing (and eventually downloading) by clicking on an “information” icon next to the object to which the metadata is attached).
11 -1. Versioned and maintained like [[structural metadata>>doc:sdmx:Glossary 2\.1.Structural metadata.WebHome]], but from Metadata Providers than Agencies.
10 +1. Stored separately from the object that it describes, yet be linked to it (for example, an organisation has a metadata repository which supports the dissemination of metadata resulting from metadata requests generated by systems or services that have access to the object for which the metadata pertains. This is common in web dissemination where additional metadata is available for viewing (and eventually downloading) by clicking on an “information” icon next to the object to which the metadata is attached).
11 +1. Versioned and maintained like structural metadata, but from Metadata Providers than Agencies.
12 12  1. Reported according to a defined structure.
13 13  
14 14  In order to achieve this, the following structures are modelled:
15 15  
16 -* The [[Metadata Structure Definition>>doc:sdmx:Glossary 2\.1.Metadata structure definition.WebHome]] which comprises the metadata [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] that can be attached to the various object types (these [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] can be structured in a [[hierarchy>>doc:sdmx:Glossary 2\.1.Hierarchy.WebHome]]), together with any [[constraints>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]] that may apply (e.g., association to a [[code list>>doc:sdmx:Glossary 2\.1.Code list.WebHome]] that contains valid values for the [[attribute>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]] when reported in a [[metadata set>>doc:sdmx:Glossary 2\.1.Metadata set.WebHome]]),
17 -* The [[Metadataflow>>doc:sdmx:Glossary 2\.1.Metadataflow.WebHome]] and/or Metadata [[Provision Agreement>>doc:sdmx:Glossary 2\.1.Provision agreement.WebHome]], which contains the objects to which the metadata are to be associated (attached),
18 -* The [[Metadata Set>>doc:sdmx:Glossary 2\.1.Metadata set.WebHome]], which contains reported metadata.
16 +* The Metadata Structure Definition which comprises the metadata attributes that can be attached to the various object types (these attributes can be structured in a hierarchy), together with any constraints that may apply (e.g., association to a code list that contains valid values for the attribute when reported in a metadata set),
17 +* The Metadataflow and/or Metadata Provision Agreement, which contains the objects to which the metadata are to be associated (attached),
18 +* The Metadata Set, which contains reported metadata.
19 19  
20 20  == 7.2 Inheritance ==
21 21  
22 22  === 7.2.1 Introduction ===
23 23  
24 -As with the [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] Structure, many of the constructs in this layer of the model inherit from the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base layer. Therefore, it is necessary to study both the inheritance and the relationship diagrams to understand the functionality of individual
24 +As with the Data Structure Definition Structure, many of the constructs in this layer of the model inherit from the SDMX Base layer. Therefore, it is necessary to study both the inheritance and the relationship diagrams to understand the functionality of individual packages. The diagram below shows the full inheritance tree for the classes concerned with the MetadataStructureDefinition, the MetadataProvisionAgreement, the Metadataflow and the MetadataSet.
25 25  
26 -packages. The diagram below shows the full inheritance tree for the classes concerned with the MetadataStructureDefinition, the MetadataProvisionAgreement, the [[Metadataflow>>doc:sdmx:Glossary 2\.1.Metadataflow.WebHome]] and the MetadataSet.
26 +There are very few additional classes in the MetadataStructureDefinition package that do not themselves inherit from classes in the SDMX Base. In other words, the SDMX Base gives most of the structure of this sub model both in terms of associations and in terms of attributes. The relationship diagrams shown in this section show clearly when these associations are inherited from the SDMX Base (see the Appendix “A Short Guide to UML in the SDMX Information Model” to see the diagrammatic notation used to depict this).
27 27  
28 -There are very few additional classes in the MetadataStructureDefinition package that do not themselves inherit from classes in the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base. In other words, the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base gives most of the structure of this sub model both in terms of associations and in terms of [[attributes>>doc:sdmx:Glossary 2\.1.Attribute.WebHome]]. The relationship diagrams shown in this section show clearly when these associations are inherited from the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] Base (see the Appendix “A Short Guide to UML in the [[SDMX Information Model>>doc:sdmx:Glossary 2\.1.SDMX Information Model.WebHome]]” to see the diagrammatic notation used to depict this).
29 -
30 30  === 7.2.2 Class Diagram - Inheritance ===
31 31  
32 -[[image:image58.png]]
30 +[[image:1749246462779-763.jpeg]]** **
33 33  
34 34  **Figure 32: Inheritance class diagram of the Metadata Structure Definition**
35 35  
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39 39  
40 40  It is important to the understanding of the relationship class diagrams presented in this section to identify the concrete classes that inherit from the abstract classes.
41 41  
42 -The concrete classes in this part of the [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] metamodel, which require to be maintained by [[Maintenance Agencies>>doc:sdmx:Glossary 2\.1.Maintenance agency.WebHome]], all inherit from MaintainableArtefact. These are:
40 +The concrete classes in this part of the SDMX metamodel, which require to be maintained by Maintenance Agencies, all inherit from MaintainableArtefact. These are:
43 43  
44 -//StructureUsage// (concrete class is [[Metadataflow>>doc:sdmx:Glossary 2\.1.Metadataflow.WebHome]])
42 +//StructureUsage// (concrete class is Metadataflow)
45 45  //Structure// (concrete class is MetadataStructureDefinition)
46 46  MetadataProvisionAgreement
47 47  
48 -These classes also inherit the identity and versioning [[facets>>doc:sdmx:Glossary 2\.1.Facet.WebHome]] of //IdentifiableArtefact//, //NameableArtefact// and //VersionableArtefact//.
46 +These classes also inherit the identity and versioning facets of //IdentifiableArtefact//, //NameableArtefact// and //VersionableArtefact//.
49 49  
50 -A //Structure// may contain several lists of [[components>>doc:sdmx:Glossary 2\.1.Component.WebHome]]. In this case the MetadataStructureDefinition acts as a list and contains //Component//s, i.e., MetadataAttributes.
48 +A //Structure// may contain several lists of components. In this case the MetadataStructureDefinition acts as a list and contains //Component//s, i.e., MetadataAttributes.
51 51  
52 52  == 7.3 Metadata Structure Definition ==
53 53  
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57 57  
58 58  === 7.3.2 Structures Already Described ===
59 59  
60 -The MetadataStructureDefinition only contains MetadataAttributes, since target objects are contained in [[Metadataflow>>doc:sdmx:Glossary 2\.1.Metadataflow.WebHome]] and MetadataProvisionAgreement, since [[SDMX>>doc:sdmx:Glossary 2\.1.Statistical data and metadata exchange.WebHome]] 3.0.
58 +The MetadataStructureDefinition only contains MetadataAttributes, since target objects are contained in Metadataflow and MetadataProvisionAgreement, since SDMX 3.0.
61 61  
62 62  === 7.3.3 Class Diagram – Relationship ===
63 63  
64 -[[image:image59.png]]
62 +[[image:1749246462786-944.jpeg]]
65 65  
66 66  **Figure 33: Relationship class diagram of the Metadata Structure Definition**
67 67  
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83 83  
84 84  The definition of the various types of Representation can be found in the specification of the Base constructs. Note that if the Representation is non-enumerated then the association is to the ExtendedFacet (which allows for XHTML as a FacetValueType). If the Representation is enumerated, then is must use a Codelist.
85 85  
86 -The Metadataflow is linked to a MetadataStructureDefinition. The Metadataflow, in addition to the attributes inherited from the Base classes, it also has a list of IdentifiableObjectSelection constructs, which resolve into the IdentifiableArtefacts that the Metadatasets will refer to. The IdentifiableObjectSelection acts like a reference, but it may also include wildcarding part of the reference terms.
84 +The Metadataflow is linked to a MetadataStructureDefinition. The Metadataflow, in addition to the attributes inherited from the Base classes, it also has a list of
87 87  
86 +IdentifiableObjectSelection constructs, which resolve into the IdentifiableArtefacts that the Metadatasets will refer to. The IdentifiableObjectSelection acts like a reference, but it may also include wildcarding part of the reference terms.
87 +
88 88  The MetadataProvisionAgreement is linked to a Metadataflow. The former, like the Metadataflow, may have IdentifiableObjectSelection constructs to be used for specifying the proper targets for reference metadata.
89 89  
90 90  ==== 7.3.4.2 Definitions ====
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124 124  
125 125  === 7.4.1 Class Diagram ===
126 126  
127 -[[image:image60.png]]
127 +[[image:1749246462791-735.jpeg]]
128 128  
129 129  **Figure 34: Relationship Class Diagram of the Metadata Set**
130 130  
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174 174  |//MetadataAttributeValue//|(((
175 175  Abstract class
176 176  Sub classes are:
177 -//UncodedMetadataAttributeValue//
178 -CodedMetadataAttributeValue
177 +//UncodedMetadataAttrib uteValue//
178 +CodedMetadataAttribut eValue
179 179  )))|(% style="width:515px" %)The value for a Metadata Attribute.
180 180  | |(((
181 181  +valueFor
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192 192  Sub class:
193 193  XHTMLAttributeValue
194 194  TextAttributeValue
195 -OtherUncodedAttributeValue
195 +OtherUncodedAttribute
196 +Value
196 196  )))|(% style="width:515px" %)The content of a Metadata Attribute value where this is textual.
197 197  |XHTMLAttributeValue| |(% style="width:515px" %)This contains XHTML
198 198  | |value|(% style="width:515px" %)The string value of the XHTML
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