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  1. or download this
    use XML::Writer;
    use IO::File;
    ...
    $xml->endTag('root');
    $xml->end;
    print $doc;
    
  2. or download this
    <root>
      <elem attr="&amp;reg;" />
    </root>
    
  3. or download this
    <root>
      <elem attr="&reg;" />
    </root>