Provided by: libsgmls-perl_1.03ii-36_all bug


       SGMLS::Refs - Forward reference handling


         use SGMLS::Refs;

       To create a new reference-manager object using the file "foo.refs":

         my $refs = new SGMLS::Refs("foo.refs");

       To create a new reference-manager object using the file "foo.refs" and logging changes to
       the file "foo.log":

         my $refs = new SGMLS::Refs("foo.refs","foo.log");

       To record a reference:

         $refs->put("document title",$title);

       To retrieve a reference:

         $title = $refs->get("document title");

       To return the number of references changed since the last run:

         $num = $refs->changed;

       To print a LaTeX-like warning if any references have changed:



       This library can be used together with the SGMLS package to keep track of forward
       references from one run to another, like the LaTeX ".aux" files.  Each reference manager
       is an object which reads and then rewrites a file of perl source, with the file name
       provided by the caller.


         # Start up the reference manager before the parse.
         sgml('start', sub { $refs = new SGMLS::Refs("foo.refs"); });

         # Warn about any changed references at the end.
         sgml('end', sub { $refs->warn; });

         # Look up the title from the last parse, if available.
         sgml('<div>', sub {
           my $element = shift;
           my $id = $element->attribute(ID)->value;
           my $title = $refs->get("title:$id") || "[no title available]";

           $current_div_id = $id;

           output "\\section{$title}\n\n";

         # Save the title for the next parse.
         sgml('<head>', sub { push_output('string'); });
         sgml('</head>', sub {
           my $title = pop_output();
           my $id = $current_div_id;



       Copyright 1994 and 1995 by David Megginson, "".  Distributed under
       the terms of the Gnu General Public License (version 2, 1991) -- see the file "COPYING"
       which is included in the distribution.


       SGMLS, SGMLS::Output.