$parm_str = "\$" . "config->{jane}->{tel_no}, "\n";

$parm_str = '$config->{jane}->{tel_no}';

##</code><code>##

package xmlutil;

#-- Use modules
use strict;
use XML::Simple;


#-- Define constants
use constant DEBUG    => 1;
use constant DELIM    => ',';

use constant XMLFILE  => './galaxy.xml';


#-- Define global variables
my $gConfig = XMLin(XMLFILE);


#-- This is the sub which is used to interface to the 
#-- main perl code. Had to do this as the C program does not
#-- know $gConfig
sub get_ival 
{

  #-- Get parameter
  my $pParm=shift;

  #-- Return the value
  print get_ivnode(\$gConfig,$pParm);

}


#-- This is the sub which recursively processes the XML hash array
sub get_ivnode
{

  #-- Get parameters
  my $pPtr=shift;
  my @pParm = split(DELIM,shift);

  #-- Define local variables
  my $lKey;
  my $lNewPtr;

  #-- Get the next key
  $lKey=shift(@pParm);

  #-- Display debugging information
  print '[',$lKey,']',"\n" if DEBUG;

  #-- Return the value if there are no further keys
  return $$pPtr unless $lKey;

  #-- Build the new pointer
  $lNewPtr=$$pPtr->{$lKey};

  #-- Call with next node
  return get_ivnode(\$lNewPtr,join(DELIM,@pParm));

}

##</code><code>##

use strict;

use lib '/temp';
use xmlutil;

xmlutil::get_ival('jane,tel_num');

##</code><code>##

  return $$pPtr unless $lKey;

  return $$pPtr->{$lKey} unless $pParm[0];