<http://schema.org/primaryImageOfPage>
"http://media.treehugger.com/assets/images/2011/10/seasonal-summer-fruits-veggies-berries-photo.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/green-food/seasonal-fruits-vegetables-for-summer/>