<http://schema.org/image_url>
"http://media.oregonlive.com/oregonian/photo/2011/04/springtimejpg-f6a304ed8baa3756.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://photos.oregonlive.com/4450/gallery/springinnepdx/index.html>