<http://schema.org/image_url>
"http://media.al.com/entertainment_impact/photo/kathy-mattea-james-minchinjpg-51114301e187320b.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/entertainment/index.ssf/2012/10/kathy_mattea_bringing_musical.html>