<http://schema.org/image_url>
"http://media.al.com/sports_impact/photo/troy-trojans-primary-wordshieldjpg-7fbd558206fbbd4b.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/sports/index.ssf/2013/07/troy_university_football_signs.html>