<http://schema.org/topics>
"Apple,battles,Gadgets,iPod Touch,Media,Microsoft,MP3 player,Music,music players,PMP,poll,web faceoff,zune hd"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/05/03/faceoff-zune-hd-vs-ipod-touch/>