<http://schema.org/keywords>
"forest, autumn, italy, Salorno, nikon, d7000, light, trees, nature, mountain horn, bosco, autunno, italia, luce, alberi, natura, monte corno"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/18065325/the-forest-by-giorgio-dalvit>