<http://schema.org/publisher>
"marketplace.500px.com"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/18545633/%25D1%2581%25D1%258B%25D1%2580%25D0%25BD%25D1%258B%25D0%25B9-%25D1%2581%25D1%2583%25D0%25BF-by-natalia-lisovskaya>