<http://schema.org/keywords>
"skate, skateboarding, sk8, board, 180, ollie, grab, jump, mini, ramp, gunner, austin, hdt, photo, pentax, kx, flash, memphis, tn"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/1507391/kowabunga-by-jonathan-kiestler>