<http://schema.org/image_url>
"http://media.al.com/sports_impact/photo/20140103-lbm-sh2-367jpg-6c47cc65ebd43c3d.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/sports/index.ssf/2014/05/michael_sams_already_made_nfl.html>