<http://schema.org/image_url>
"http://media.pennlive.com/patriot-news/photo/2011/01/-1230405b10290c6d.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://photos.pennlive.com/4503/gallery/inaugural_mass_at_st_patrick_cathedral/index.html>