<http://schema.org/image_url>
"http://media.al.com/breaking/photo/carpenter-technologyjpg-a4d1c0ffaceba399.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/business/index.ssf/2013/07/carpenter_technologys_160-ton.html>