<http://schema.org/keywords>
"article"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.vanityfair.com/news/2013/01/All-the-Reasons-Why-Everyone-Especially-John-McCain-Might-Dislike-Defense-Secretary-Nominee-Chuck-Hagel?mbid=social_retweet>