<http://schema.org/image_url>
"http://media.gulflive.com/mississippi-press-news/photo/clary-oil-spilljpg-f37ee422d97025ac.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://blog.gulflive.com/mississippi-press-news/2010/06/snapshot_of_the_frontline_exec.html>