<http://schema.org/image_url>
"http://media.al.com/sports_impact/photo/robert-griffin-iii-5788c7d33349b7eb.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.masslive.com/sports/index.ssf/2013/10/obama_open_to_name_change_for.html>