<http://schema.org/topics>
"Apple,bill gates,Entertainment,humor,Microsoft,Music,parody,rap,Steve Jobs,Uncategorized,Video,Videos,Watercooler,viral video,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/06/14/steve-jobs-bill-gates-rap-battle/>