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<document>
 <product>
...
  <color></color>
 </product>
</document>

XML::Twig->new( twig_roots => { content => \&content }, twig_print_out
+side_roots => 1, keep_spaces => 1, ) ->parsefile( 'ginormous.xml');

...
$content->set_cdata($snipped);

$t->flush; }

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