<http://schema.org/primaryImageOfPage>
"http://media.treehugger.com/assets/images/2012/11/4_Colour_Sunwheel.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/culture/richard-shilling-land-art-finds-beauty-nature/page/2/>