<http://schema.org/image_url>
"http://media.nola.com/new_orleans/photo/sister-helen-prejean-624a2d2eaf1aa7f4.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/politics/index.ssf/2013/04/sister_helen_prejean_rev_welto.html>