<http://schema.org/image_url>
"http://media.nola.com/politics/photo/covington-west-30s-tin-roofsjpg-bc690638a3912cab.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/politics/index.ssf/2010/03/covington_west_30s_survey_prov.html>