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isbn — The International Standard Book Number of a document
isbn ::= (#PCDATA|link|olink|ulink|emphasis|trademark|replaceable|remark|subscript|superscript|inlinegraphic|inlinemediaobject|indexterm)*
               An ISBN is the International
               Standard Book Number of a document.
               
            
Formatted inline. Sometimes suppressed.
Deprecated as of DocBook V4.2, see biblioid instead.
               
These elements contain isbn:
                  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 isbn:
                  emphasis, indexterm, inlinegraphic, inlinemediaobject, link, olink, remark, replaceable, subscript, superscript, trademark, ulink.
               
biblioid, invpartnumber, issn, issuenum, productnumber, pubsnumber, seriesvolnums, volumenum.