package My::Groovy::Module;

use strict;
use XML::Sablotron;
use vars qw(@ISA, $VERSION);

@ISA = qw(XML::Sablotron);

...

sub new { 
    my $proto = shift;
    my $class = ref($proto) || $proto;

    my $self = $class->SUPER::new();

    ...
}