<http://schema.org/primaryImageOfPage>
"http://media.mnn.com/assets/images/2009/12/International_Cat_Show_in_Warsaw-50863.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/gadgets-electronics/photos/eco-photos-of-the-week-nov-29-dec-5/warsaw-goes-cat-crazy>