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SubjectSet = (Subject+) Subject = (SubjectTerm+) SubjectTerm = (#PCDATA)
Elements : SubjectSet, Subject, SubjectTerm.
Attributes : Scheme, Weight.
It is possible to give in the meta-information of a document or passage a
set of subjects covered by the document or passage, using terms from a
controlled vocabulary. In this case, the element SubjectSet is used.
The SubjectSet element contains one or several Subject
elements, each representing a distinct subject of the document or passage.
The Subject element, in turn, is composed of one or several
SubjectTerm elements, each representing a term of the subject.
The terms used in the different SubjectTerm elements must all come
from a same controlled vocabulary. This controlled vocabulary will be
specified with the Scheme attribute of the SubjectSet element.