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returnvalue — The value returned by a function
returnvalue ::= (#PCDATA|replaceable|inlinegraphic|inlinemediaobject|indexterm|beginpage)*
               ReturnValue identifies the value returned by a
               function or command.  
               
            
These elements contain returnvalue:
                  action, application, attribution, bibliomisc, bridgehead, citation, citetitle, classsynopsisinfo, code, command, computeroutput, database, emphasis, entry, filename, firstterm, foreignphrase, funcparams, funcsynopsisinfo, function, glosssee, glossseealso, glossterm, hardware, interfacename, keycap, lineannotation, link, literal, literallayout, lotentry, member, msgaud, olink, option, optional, para, parameter, phrase, primary, primaryie, productname, programlisting, property, quote, refdescriptor, refentrytitle, refname, refpurpose, remark, screen, screeninfo, secondary, secondaryie, see, seealso, seealsoie, seeie, seg, segtitle, simpara, subtitle, synopsis, systemitem, td, term, termdef, tertiary, tertiaryie, th, title, titleabbrev, tocback, tocentry, tocfront, trademark, ulink, userinput.
               
The following elements occur in returnvalue:
                  beginpage, indexterm, inlinegraphic, inlinemediaobject, replaceable.
               
funcdef, funcparams, funcprototype, funcsynopsisinfo, function, paramdef, parameter, varargs, void.
               
            
<!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<para>
The <function>open</function> function returns <returnvalue>2</returnvalue>
(<errorname>ENOFILE</errorname>) if the file does not exist.
</para>
               The open function returns 2
               (ENOFILE) if the file does not exist.