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<book>
<chapter id="1">
...
   </part>
</chapter>
</book>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Tr
+ansform">

...
</xsl:template>

</xsl:stylesheet>

use strict;
use warnings;
...
my $results    = $stylesheet->transform($source);

print $stylesheet->output_string($results);