Preserving <!DOCTYPE>

Grace Tamashiro (grace.tamashiro@jpl.nasa.gov)
Mon, 05 Jan 1998 11:01:08 -0800 

Hello,

For some reason, 
  $h = new HTML::TreeBuilder;
  $h->parse($doc);
  ..
  print $h->as_HTML;

removes the <!DOCTYPE> instance public indentifier from the output.  Is
there a way to preserve this?  Thanks for your help :).

-Grace