document-id Related Object Document Identifier

Identifier of a document within a publication that is (or contains) the target of the <related-object> element.


This attribute holds an external identifier assigned to a publication that is part of the description of a related object (<related-object>).
OPTIONAL on element: <related-object>
Value Meaning
Text, numbers, or special characters An identifier for the document that contains the related object (<related-object>).
Restriction This is an optional attribute; there is no default.