<http://schema.org/primaryImageOfPage>
"http://media.treehugger.com/assets/images/2011/11/3-portaledge.jpeg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/culture/week-in-pictures-hanging-tree-hotels-thanksgiving-goes-vegan/page/2/>