<http://schema.org/image_url>
"http://media.al.com/entertainment_impact/photo/etsaipianojpg-ab9dbe989a7df8de.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/entertainment/index.ssf/2013/03/keys_to_a_miracle_marathon_bri.html>