p5-XML-LibXML

	I used libxml parser to validate a xml file against a DTD. The
	error message thrown does not have a line number. So I was
	having difficultly figuring out which of the multiple
	instances of an element type was causing the problem.

Fix: libxml2 provides a variable (xmlLineNumbersDefaultValue)  that
	can be set. The p5-XML-LibXML module must allow access to this
	variable.  
	
	The fix is included below
	
-------------------------------------------------------------------
How-To-Repeat: 	use p5-XML-LibXML; 

	my $parser = XML::LibXML->new;
	$parser->validation(1);
	$parser->pedantic_parser(1);
	$parser->load_ext_dtd(1);
	eval { 
	    $parser->parse_string($message);
	};
	if ($@){
	    print "Error: $@ \n";
	    die ("process_xml");
	}
	
	where message contains a XML structure with a reference to a
	DTD. The XML structure is inconsistent with the DTD.