<http://schema.org/topics>
"Britney Spears,news,hold-it-against-me,Music,music video,plentyoffish,sony,Uncategorized,vevo,Video,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/02/18/britney-spears-hold-it-against-me-video/>