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keyword — One of a set of keywords describing the content of a document
               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.