<http://schema.org/image_url>
"http://media.nola.com/politics/photo/textingjpg-90b8e4f0e02a3536.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/living/index.ssf/2011/02/omg_when_did_we_start_talking.html>