<http://schema.org/keywords>
"capture, december, greece, landscape, mountains, night, petrilio, sky, snow, snow trees, stars, trees, winter night sky, winter sky, Orion"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/22375373/winter-night-capture-by-konstantinos-vasilakakos>