<http://schema.org/keywords>
"mist, sunset, switzerland, mountain, alps, zermatt, nebel, schweiz, alpen, berg, abendrot, wallis, matterhorn, rock wall, felswand"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/21604553/matterhorn-by-philipp-hoerler>