subjectset — A set of terms describing the subject matter of a document.


subjectset ::=


Common attributes and common linking attributes.

Additional attributes:

  • scheme (NMTOKEN)


A subjectset is a container for a set of subjects. All of the subjects within a subjectset should come from the same controlled vocabulary.

A document can be described using terms from more than one controlled vocabulary. In order to do this, you should use the scheme attribute to distinguish between controlled vocabularies.

Processing expectations

May be formatted inline or as a displayed block, depending on context. Subjects are rarely displayed to a reader. Usually, they are reserved for searching and retrieval purposes.

DocBook does not specify a relationship between subjectsets in different parts of a document or between a subjectset and the subjectsets of enclosing parts of the document.


Common attributes and common linking attributes.

any attribute

Any attribute in any other explicit namespace


Identifies the controlled vocabulary used by this set's terms


These elements contain subjectset: biblioentry, bibliomixed, bibliomset, biblioset, info (, info (, info (, info (, info (, merge.


The following elements occur in subjectset: subject.

See Also

Related elements: keyword, keywordset, subject, subjectterm.


 1 |<article xmlns=''>
   |  <title>Example subjectset</title>
   |  <subjectset scheme="libraryofcongress">
 5 |    <subject>
   |      <subjectterm>Electronic Publishing</subjectterm>
   |    </subject>
   |    <subject>
   |      <subjectterm>SGML (Computer program language)</subjectterm>
10 |    </subject>
   |  </subjectset>
15 |