The <topicSubjectHeader> element specifies constraints on the subjects used in classifications.

Use the <topicSubjectHeader> element to supply a header row for a topic classification table when you want to encourage classification with subjects from different categories (also known as a facet classification). Each cell in the header row identifies the subject for a different category. As a best practice, the subjects in the same column within the classification rows must appear in the category in the subject scheme. For instance, if the cell within the header row specifies the Operating System category, the subjects in the column must be kinds of operating systems.

Content models

See appendix for information about this element in OASIS document type shells.


+ map/relrow classify-d/topicSubjectHeader


For a complete example in the context of the <topicSubjectTable>, see Example.


The following attributes are available on this element: Universal attribute group.

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