<http://schema.org/image_url>
"http://media.nola.com/politics/photo/rick-perry-signs-bookjpg-0842cc4a9ad49d20.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/politics/index.ssf/2011/09/gop_debate_tonight_features_fi.html>