<http://schema.org/image_url>
"http://media.nola.com/tpphotos/photo/2013/05/12691654-large.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/jazzfest/index.ssf/2013/05/a_last_look_back_at_the_highs.html>