objA fooA fooB objB fooA fooB ##
##

use strict;
use warnings;

use English;
use XML::Twig;

my $xmlFile = "demo.xml";

my $t = XML::Twig->new(
        keep_atts_order => 1,  
        pretty_print => 'indented_a',
        twig_roots => { 
            # following gives "unrecognized expression in handler" error
            #q(myconfig/myobj[uniqueName="objA"]/myattributes/attribB) => \&getfoo,
            q(myconfig/myobj/myattributes/attribB) => \&getfoo,
        }   
);
$t->parsefile( $xmlFile );
$t->print;

exit 0;

sub getfoo {
    my ($t, $e) = @_; 
    print "text=", $e->text(), 
          "' tag='", $e->tag(), 
          "' path='", $e->path(), 
          "' parentTag='", $e->parent->tag(), "'\n";