<http://schema.org/keywords>
"alone, cube, river, motion, time, color, long exposure, tejo, mood, deep, minimalism, lisbon, portugal, cresende, exterior, nobody, outside"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/17979399/a-l-o-n-e-by-carlos-resende>