<http://schema.org/keywords>
"beach, clouds, cloudy, f16, la jolla, landscape, late afternoon, nikon, ocean, photography, rocks, seascape, sun, sunset, swirl, tokina, water, watery, wide angle"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/3943325/left-alone-by-kt-gravatt>