<http://schema.org/topics>
"Boston,boston bombings,Boston Marathon,Dzhokhar Tsarnaev,Health &amp; Fitness,Media,The New York Times,Uncategorized,U.S.,World"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2014/04/15/best-boston-marathon-coverage/>