<http://schema.org/image_url>
"http://media.masslive.com/sports_impact/photo/clint-dempsey-8e8d1f04e68c4198.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.masslive.com/sports/index.ssf/2012/05/clint_dempsey_and_rising_score.html>