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keywordset — A set of keywords describing the content of a document
               A set of keywords, provided by the author, editor, publisher, and so on, can
               be stored in the document meta-information in a KeywordSet.
               
            
Keywords can form an important part of an automated indexing or searching strategy for a collection of documents.
May be formatted inline or as a displayed block, depending on context. Keywords are rarely displayed to a reader. Usually, they are reserved for searching and retrieval purposes.
                  Unlike SubjectTerms, which should be drawn from a
                  controlled vocabulary, keywords may be chosen freely.
                  
               
                  Although more than one KeywordSet may appear in the
                  meta-information for a document, neither a relationship nor a specific
                  facility for constructing a relationship is defined by DocBook.
                  
               
                  Additionally, no relationship is defined between the
                  KeywordSets of a document component and the
                  KeywordSets of its parents or children.
                  
               
These elements contain keywordset:
                  appendixinfo, articleinfo, bibliographyinfo, blockinfo, bookinfo, chapterinfo, glossaryinfo, indexinfo, objectinfo, partinfo, prefaceinfo, refentryinfo, referenceinfo, refsect1info, refsect2info, refsect3info, refsectioninfo, refsynopsisdivinfo, sect1info, sect2info, sect3info, sect4info, sect5info, sectioninfo, setindexinfo, setinfo, sidebarinfo.