<http://schema.org/image_url>
"http://media.al.com/business_impact/photo/dsc-0294jpg-973c676cfa2ab9f4.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.al.com/business/index.ssf/2013/12/drug_research_among_growing_ec.html>