<http://schema.org/image_url>
"http://media.nj.com/politics_impact/photo/1107christieobamajpg-05e1ba2172a8d779.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.nj.com/politics/index.ssf/2012/11/new_jersey_election_residents.html>