Changes for page 7 Metadata Structure Definition and Metadata Set

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5	5	== 7.1 Context ==
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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:
	7	+Besides the possibility to extend the [[components>>doc:IMElements.components.WebHome]] of Data Structure Definitions by [[metadata>>doc:IMElements.metadata.WebHome]] attributes defined in Metadata Structure Definitions, the SDMX metamodel allows [[metadata>>doc:IMElements.metadata.WebHome]] to describe any identifiable artefact. These [[metadata>>doc:IMElements.metadata.WebHome]] can be:
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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 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).
	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>>doc:IMElements.metadata.WebHome]] resulting from [[metadata>>doc:IMElements.metadata.WebHome]] requests generated by systems or services that have access to the object for which the [[metadata>>doc:IMElements.metadata.WebHome]] pertains. This is common in web dissemination where additional [[metadata>>doc:IMElements.metadata.WebHome]] is available for viewing (and eventually downloading) by clicking on an “information” icon next to the object to which the [[metadata>>doc:IMElements.metadata.WebHome]] is attached).
11	11	1. Versioned and maintained like structural metadata, but from Metadata Providers than Agencies.
12		-1. Reported according to a defined structure.
	12	+1. Reported according to a defined [[structure>>doc:IMElements.structure.WebHome]].
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14	14	In order to achieve this, the following structures are modelled:
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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.
	16	+* The Metadata Structure Definition which comprises the [[metadata>>doc:IMElements.metadata.WebHome]] 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>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.StructureUsage.Metadataflow.WebHome]] and/or Metadata Provision Agreement, which contains the objects to which the [[metadata>>doc:IMElements.metadata.WebHome]] are to be associated (attached),
	18	+* The Metadata Set, which contains reported [[metadata>>doc:IMElements.metadata.WebHome]].
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20	20	== 7.2 Inheritance ==
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22	22	=== 7.2.1 Introduction ===
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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
	24	+As with the Data Structure Definition [[Structure>>doc:IMElements.AnnotableArtefact.IdentifiableArtefact.NameableArtefact.VersionableArtefact.MaintainableArtefact.Structure.WebHome]], 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
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26	26	packages. The diagram below shows the full inheritance tree for the classes concerned with the MetadataStructureDefinition, the MetadataProvisionAgreement, the Metadataflow and the MetadataSet.
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