<http://schema.org/image_url>
"http://media.oregonlive.com/oregonian/photo/2011/01/-53789d9e38f78b29.JPG"^^<http://www.w3.org/2001/XMLSchema#string>
<http://photos.oregonlive.com/4450/gallery/nike_vs_under_armour_an_underlying_battle_in_bcs_national_championship/index.html>