use strict;
use XML::Twig;

use XML::XPath;
use XML::XPath::XMLParser;

my $twig= new XML::Twig(  TwigHandlers => { product => \&product }  );                    

$twig->parsefile("file.xml");

my @height = $twig->get_xpath ('//measure[string(c093)="01"]');  #if i want to get the length