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<?xml version="1.0" encoding="UTF-8"?> 
<oval xsi:schemaLocation="http://oval.mitre.org/XMLSchema/oval#redhat 
...
  </definitions> 
  <crap>This is some crap</crap> 
</oval>

use XML::Twig; 

...

$doc->parsefile("test.xml"); 
$doc->flush();

  <definition class="vulnerability" id="OVAL3"> 
    <affected family="windows"> 
...
</oval>