<http://schema.org/primaryImageOfPage>
"http://media.mnn.com/assets/images/2009/11/Wagathas_CranberryBiscuits.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/family/pets/photos/15-eco-friendly-dog-treats/wagathas-cranberry-cheddar-biscuits>