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<newitems>
    <book id="bk101">
...
          with XML.</description>
  </book>
</newitems>

<?xml version="1.0"?>
<catalog>
...
      environment.</description>
   </book>
</catalog>

#!/usr/bin/perl
use strict;
...
    $xmlParser->parse($txt);
    return $xmlParser;
}

$ perl ex_XML_merge_twig.pl
1 new books to add to the catalog!
...
          with XML.</description>
  </book>
</catalog>