my $path =  '//includes/include';
    my $nodes = $xp->find($path);
    for my $include ($nodes->get_nodelist) {
        my $priority = $xp->find('./priority', $include);
        my $location = $xp->find('./location', $include);
        print "Location = " . $location->string_value;
        print ", with Priority = " . $priority->string_value . "\n";
 
        ## I want to change this priority value to +1