<http://schema.org/image_url>
"http://media.masslive.com/sports_impact/photo/paul-pierce-lebron-jamesjpg-4542a157da6eeb11.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.masslive.com/sports/index.ssf/2010/10/celtics_beat_heat_88-80_despit.html>