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Depends on some other files that aren't in the CVS repository, so this
won't work for anyone else, but I am rocking now. A file is being read
off the disk and being processed through lonxml... in other words, all
the hard parts I wasn't sure about. It's mostly typing from here.

# The LearningOnline Network with CAPA
# .helper XML handler to implement the LON-CAPA helper
#
# $Id: lonhelper.pm,v 1.2 2003/03/21 21:34:56 bowersj2 Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# (Page Handler
#
# (.helper handler
#

package Apache::lonhelper;
use Apache::Constants qw(:common);
use Apache::File;

BEGIN {
    &Apache::lonxml::register('Apache::lonhelper', 
                              ('helper'));
}

my $r;

sub handler {
    $r = shift;
    $ENV{'request.uri'} = $r->uri();
    my $filename = '/home/httpd/html' . $r->uri();
    my $fh = Apache::File->new($filename);
    my $file;
    read $fh, $file, 1000000000;

    $result = &Apache::lonxml::xmlparse($r, 'helper', $file);
                                        

    $r->print("\n\n$result");
    return OK;
}

sub start_helper {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;

    if ($target ne 'helper') {
        return '';
    }
    
    return 'Helper started.';
}

sub end_helper {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    
    return 'Helper ended.';
}

1;

__END__