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secondary — A secondary word or phrase in an index term
secondary ::= (#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)*
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| sortas | CDATA | None | 
               Secondary contains a secondary word or phrase in an
               IndexTerm.  The text of a Secondary term
               is less significant than the Primary term, but more
               significant than the Tertiary term for sorting and
               display purposes.
               
            
               In IndexTerms, you can only have one primary,
               secondary, and tertiary term. If you want to index multiple
               secondary terms for the same primary, you must repeat the
               primary in another IndexTerm. You cannot place
               several Secondarys in the same primary.
               
            
Suppressed. This element provides data for processing but is not rendered in the primary flow of text.
                  
                  The InterfaceDefinition
                  element will be discarded in DocBook V4.0. It will no longer be available
                  in the content model of this element.
                  
               
The following elements occur in secondary:
                  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, 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.
               
                        SortAs specifies the string by which the 
                        element's content is to be sorted. If unspecified, the proper content
                        is used.
                        
                     
indexentry, indexterm, primary, primaryie, secondaryie, see, seealso, seealsoie, seeie, tertiary, tertiaryie.