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bridgehead — A free-floating heading
bridgehead ::= (#PCDATA|footnoteref|xref|biblioref|abbrev|acronym|citation|citerefentry|citetitle|citebiblioid|emphasis|firstterm|foreignphrase|glossterm|termdef|footnote|phrase|orgname|quote|trademark|wordasword|personname|link|olink|ulink|action|application|classname|methodname|interfacename|exceptionname|ooclass|oointerface|ooexception|package|command|computeroutput|database|envar|errorcode|errorname|errortype|errortext|filename|function|guibutton|guiicon|guilabel|guimenu|guimenuitem|guisubmenu|hardware|interface|keycap|keycode|keycombo|keysym|literal|code|constant|markup|medialabel|menuchoice|mousebutton|option|optional|parameter|prompt|property|replaceable|returnvalue|sgmltag|structfield|structname|symbol|systemitem|uri|token|type|userinput|varname|nonterminal|anchor|author|authorinitials|corpauthor|corpcredit|modespec|othercredit|productname|productnumber|revhistory|remark|subscript|superscript|inlinegraphic|inlinemediaobject|inlineequation|indexterm)*
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               Some documents, usually legacy documents, use headings that are
               not tied to the normal sectional hieararchy.
               These headings may be
               represented in DocBook with the BridgeHead element.  
               
            
               BridgeHeads may also be useful in fiction or journalistic 
               works that don't have a nested hierarchy.
               
            
                  A BridgeHead is formatted as a block, using the same
                  display properties as the section heading which it
                  masquerades as.  The RenderAs
                  attribute controls which heading it mimics.
                  
               
                  
                  The InterfaceDefinition
                  element will be discarded in DocBook V4.0. It will no longer be available
                  in the content model of this element.
                  
               
These elements contain bridgehead:
                  answer, appendix, article, bibliodiv, bibliography, blockquote, callout, caution, chapter, constraintdef, glossary, glossdiv, important, index, itemizedlist, listitem, msgexplan, msgtext, note, orderedlist, partintro, preface, procedure, qandadiv, qandaset, question, refsect1, refsect2, refsect3, refsection, refsynopsisdiv, revdescription, sect1, sect2, sect3, sect4, sect5, section, setindex, sidebar, simplesect, step, taskprerequisites, taskrelated, tasksummary, tip, variablelist, warning.
               
The following elements occur in bridgehead:
                  abbrev, acronym, action, anchor, application, author, authorinitials, biblioref, citation, citebiblioid, citerefentry, citetitle, classname, code, command, computeroutput, constant, corpauthor, corpcredit, 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, orgname, othercredit, package, parameter, personname, phrase, productname, productnumber, prompt, property, quote, remark, replaceable, returnvalue, revhistory, sgmltag, structfield, structname, subscript, superscript, symbol, systemitem, termdef, token, trademark, type, ulink, uri, userinput, varname, wordasword, xref.
               
                        The RenderAs attribute identifies how the
                        BridgeHead should be rendered. In this way, a
                        BridgeHead can be made to appear as a Sect1,
                        for example.