<http://schema.org/topics>
"activision,apps,Apple,app store (iOS) ,Gaming,guitar hero,iPhone,iPod Touch,Mashable,Music,news,queen,the rolling stones,WWDC,wwdc 2010"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/06/07/guitar-hero-iphone/>