<http://schema.org/image_url>
"http://media.al.com/sports_impact/photo/manzielauapjpg-a887e617332d8a0f.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/sports/index.ssf/2013/11/biggest_improvement_in_texas_a.html>