<http://schema.org/image_url>
"http://media.nola.com/tpphotos/photo/2013/04/12616917-large.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/jazzfest/index.ssf/2013/04/new_orleans_jazz_fest_critics.html>