<http://schema.org/image_url>
"http://media.al.com/business_impact/photo/14264131-mmmainjpg-aaa1cb89742ad898.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/business/index.ssf/2014/03/snow_storm_in_mid-february_cos.html>