my $field= 'content';
                                            
my $twig= new XML::Twig( twig_roots    => { $field => 1 },
                                              
                         twig_print_outside_roots => 1, 
                         twig_handlers => { $field => \&field } ); 

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

sub field
  { my( $twig, $field)= @_;                      
    $field->delete;    
  }