Identifier of an object (for example, a table, figure, or sidebar) within a separate document that is the target of the <related-object> element.
Used along with @object-id-type to identify the object within a document that is the target of the <related-object> element. The @object-id might contain a DOI as content, and the @object-id-type should indicate that this identifier is a DOI. The @object-id also might contain the XML ID of the target object.
Best Practice: For each source, document, and object, an identifier should be specified on the corresponding attribute. For any related-object link, the @source-id attribute points to the largest publishable unit, for example, an entire book. The @document-id attribute points to a major component of the source; for example, a chapter, front matter section (Preface) or back matter section (Appendix) of a book. Use the @object-id attribute to point to any item within the specified major document component; for example, a section, figure, table, or reference within the chapter of the book.
Where the more specific attributes are populated, the less specific attributes should also be populated. For example, if @object-id is specified, then both @document-id and @source-id should also be populated. If @source-id points to the intended target (an entire book), then neither @document-id nor @object-id should be specified.