(title?, (externallink|footnoteref|indexterm|link|xref|#PCDATA|functionparam| varparam|anchor|action|application|button|classname|command| computeroutput|constant|dbname|dbtable|dbfield|dbrecord|errorname| errortype|eventtype|eventstructure|filename|option|function|hardware| hwapplic|icon|interface|interfacedefinition|keycap|keycode|keysym| lineannotation|literal|macro|mask|menu|menuitem|prompt|property| osname|protocolrequest|resource|returnvalue|structfield|structname| swapplic|symbol|systemitem|systemname|token|type|userinput|author| authorinitials|booktitle|copyright|corpauthor|corpname|date|editor| edition|invpartnumber|isbn|legalnotice|orgname|othercredit| printhistory|productname|productnumber|publisher|pubsnumber| releaseinfo|revhistory|series|subtitle|volumenumber|optional|acronym| character|charset|citation|citebook|citechap|citerefentry|citesect| comment|emphasis|firstterm|font|foreignphrase|glossarydef| glossaryterm|glyph|quote|subscript|superscript|trademark|wordasword| graphic|equation|synopsis)+)