<http://schema.org/primaryImageOfPage>
"http://media.treehugger.com/assets/images/2012/06/airport-check-in-kiosks.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/corporate-responsibility/5-things-india-can-teach-us-about-green-business-sustainability/page/2/>