<http://schema.org/primaryImageOfPage>
"http://media.mnn.com/assets/images/2013/08/london-double-decker-bus-big-ben.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/eco-tourism/photos/9-great-public-transit-options-for-sightseeing/londons-double-decker>