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contractnum — The contract number of a document
contractnum ::= (#PCDATA|link|olink|ulink|emphasis|trademark|replaceable|remark|subscript|superscript|inlinegraphic|inlinemediaobject|indexterm)*
               The ContractNum element that occurs in bibliographic metadata
               contains information about the contract number of a contract
               under which a document was written.
               
            
May be formatted inline or as a displayed block, depending on context. Sometimes suppressed.
These elements contain contractnum:
                  appendixinfo, articleinfo, biblioentry, bibliographyinfo, bibliomixed, bibliomset, biblioset, blockinfo, bookinfo, chapterinfo, glossaryinfo, indexinfo, objectinfo, partinfo, prefaceinfo, refentryinfo, referenceinfo, refsect1info, refsect2info, refsect3info, refsectioninfo, refsynopsisdivinfo, sect1info, sect2info, sect3info, sect4info, sect5info, sectioninfo, setindexinfo, setinfo, sidebarinfo.
               
The following elements occur in contractnum:
                  emphasis, indexterm, inlinegraphic, inlinemediaobject, link, olink, remark, replaceable, subscript, superscript, trademark, ulink.