$mobihtmltwig = XML::Twig->new( 
        load_DTD => 1, 
        twig_roots => { 'metadata' => 1 }, 
        twig_handlers => { 'metadata' => \&twig_cut_metadata }, 
        output_encoding => 'utf8', 
        pretty_print => 'indented', 
        twig_print_outside_roots => 'HTML' 
        ); 
 
    $mobihtmltwig->set_doctype( 
        'package', 
        "http://openebook.org/dtds/oeb-1.2/oebpkg12.dtd", 
        "+//ISBN 0-9673008-1-9//DTD OEB 1.2 Package//EN"); 
 
    $mobihtmltwig->entity_list->add_new_ent(copy => "©"); 
 
    print $mobihtmltwig->entity_names,"\n"; 
 
    $mobihtmltwig->parsefile($mobihtmlfile);