<http://schema.org/image_url>
"http://media.al.com/entertainment_impact/photo/govt-mule-photo2-photocredit-anna-webber-844affe34ffffcca.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/entertainment/index.ssf/2014/02/govt_mules_warren_haynes_discu.html>