<http://schema.org/image_url>
"http://media.nola.com/politics/photo/andrew-breitbartjpg-754c6bec5b241a24.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/politics/index.ssf/2012/03/from_tulane_to_acorn_new_orlea.html>