<http://schema.org/image_url>
"http://media.al.com/sports_impact/photo/bryant-denny-grassjpg-04db3bf24b9e1831-largejpg-0f0f3831840014c2.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/sports/index.ssf/2011/03/alabama_football_faces_five_pr.html>