<http://schema.org/primaryImageOfPage>
"http://media.treehugger.com/assets/images/2013/02/ceiling-detail.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/interior-design/build-climbing-cave-your-attic-or-garage/page/4/>