<http://schema.org/primaryImageOfPage>
"http://media.mnn.com/assets/images/2013/12/Great-Orange-Tip-Caterpillar.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/photos/15-amazingly-deceptive-caterpillars/great-orange-tip-caterpillars>