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print   $gen->rss([itunes => "http://www.itunes.com/dtds/podcast-1.0.d
+td"], {version => '2.0'});

<itunes:rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" 
+version="2.0" />

<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version
+="2.0">