A Subtitle identifies the subtitle of a document, or portion of a document.
These elements contain subtitle: appendix, appendixinfo, article, articleinfo, bibliodiv, biblioentry, bibliography, bibliographyinfo, bibliomixed, bibliomset, biblioset, blockinfo, book, bookinfo, chapter, chapterinfo, colophon, dedication, glossary, glossaryinfo, glossdiv, index, indexdiv, indexinfo, lot, objectinfo, part, partinfo, partintro, preface, prefaceinfo, refentryinfo, reference, referenceinfo, refsect1, refsect1info, refsect2, refsect2info, refsect3, refsect3info, refsection, refsectioninfo, refsynopsisdiv, refsynopsisdivinfo, sect1, sect1info, sect2, sect2info, sect3, sect3info, sect4, sect4info, sect5, sect5info, section, sectioninfo, set, setindex, setindexinfo, setinfo, sidebarinfo, simplesect, toc.
The following elements occur in subtitle: abbrev, acronym, action, anchor, application, author, authorinitials, citation, citerefentry, citetitle, classname, command, computeroutput, constant, corpauthor, database, email, emphasis, envar, errorcode, errorname, errortext, errortype, exceptionname, filename, firstterm, footnote, footnoteref, foreignphrase, function, glossterm, guibutton, guiicon, guilabel, guimenu, guimenuitem, guisubmenu, hardware, indexterm, inlineequation, inlinegraphic, inlinemediaobject, interface, interfacename, keycap, keycode, keycombo, keysym, link, literal, markup, medialabel, menuchoice, methodname, modespec, mousebutton, nonterminal, olink, ooclass, ooexception, oointerface, option, optional, othercredit, parameter, personname, phrase, productname, productnumber, prompt, property, quote, remark, replaceable, returnvalue, revhistory, sgmltag, structfield, structname, subscript, superscript, symbol, systemitem, token, trademark, type, ulink, userinput, varname, wordasword, xref.