<http://schema.org/image_url>
"http://media.nola.com/politics/photo/landrieu10jpg-b2ca2743d7457500.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nola.com/politics/index.ssf/2013/01/two_top_landrieu_aides_are_swi.html>