<http://schema.org/keywords>
"Unapologetic"^^<http://www.w3.org/2001/XMLSchema#string>
<http://blogs.wsj.com/speakeasy/2012/11/21/rihanna-means-never-having-to-say-youre-sorry/?mod=WSJBlog&mod=WSJ_LifeStyle_Speakeasy>