<http://schema.org/image_url>
"http://media.al.com/alphotos/photo/2012/04/-1256458dbf4d6a9c.JPG"^^<http://www.w3.org/2001/XMLSchema#string>
<http://photos.al.com/4558/gallery/luke_bryan_at_the_tuscaloosa_amphitheater/index.html>