<http://schema.org/primaryImageOfPage>
"http://media.mnn.com/assets/images/2012/01/stewartia_pseudocamillia1.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/organic-farming-gardening/photos/18-trees-with-beautiful-bark/take-a-closer-look>