- Related Item Id (M43). This subelement identifies the related record(s). One instance of this subelement must appear in every Relation (M42); the subelement is marked as conditional because a Relation (M42) is optional.
There are two ways of specifying the identity of the related record.
The preferred method is to include the VEO Identifier (M99) of the related record inside the Related Item Id (M43). This allows a relation to refer to records in another agency or in another series. An example of this approach is:
<naa:RelatedItemId>
<vers:VEOIdentifier>
<vers:FileIdentifier><vers:Text>99-89</vers:Text></vers:FileIdentifier>
<vers:VERSRecordIdentifier>
<vers:Text>100</vers:Text>
</vers:VERSRecordIdentifier>
</vers:VEOIdentifier>
</naa:RelatedItemId>
(Note that this example does not include Agency or Series Identifiers.)
An alternative is to include the value of the VERS Record Identifier (M103) subelement from the related record as text in the Related Item Id subelement. The record referenced in the previous example would be represented in the following way using this approach:
<naa:RelatedItemId>100</vers:VERSRecordIdentifier>
Note that when using this approach it is not possible to reference a record in a different series or agency.
The second alternative is included because the first version of the Standard was not sufficiently precise about the value contained in a Related Item Id (M43) subelement.
- Relation Type (M44). This subelement indicates the type of relationship between the records. One instance of this subelement must appear in each Relation (M42) element (Relation Type (M44) is marked as conditional because Relation (M42) itself is optional). The NAA Standard allows multiple Relation Type subelements to appear in a Relation (M42); it is strongly recommended that each Relation (M42) only contains one Relation Type (M44).
- Relation Description (M45). This subelement describes the relationship. One instance of this subelement must appear in each Relation (M42) element (Relation Description (M45) is marked as conditional because Relation (M42) itself is optional). The NAA Standard allows multiple Relation Description subelements to appear in a Relation (M42); it is strongly recommended that each Relation (M42) only contains one Relation Description (M45).
An example of the XML representation of a relation follows:
<naa:Relation>
<naa:RelatedItemId>
<vers:VEOIdentifier>
<vers:FileIdentifier>
<vers:Text>99-89</vers:Text>
</vers:FileIdentifier>
<vers:VERSRecordIdentifier>
<vers:Text>100</vers:Text>
</vers:VERSRecordIdentifier>
</vers:VEOIdentifier>
</naa:RelatedItemId>
<naa:RelationType>Replaces</naa:RelationType>
<naa:RelationDescription>
Replaced with new version
</naa:RelationDescription>
</naa:Relation>
(Note that this example does not include Agency or Series Identifiers.)
