Keyword ::= (#PCDATA)
Both the start- and end-tags are required for this element.
A Keyword is a term describing the content of a document. The keyword applies to the document component that contains it.
Keywords are rarely displayed to a reader. Usually, they are reserved for searching and retrieval purposes. If they are displayed, they may be displayed either inline or as a displayed block, depending on context.
Unlike SubjectTerms, which should be drawn from a controlled vocabulary, keywords may be chosen freely.
These elements contain Keyword: KeywordSet.
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