<http://schema.org/keywords>
"2012, aaron meyers photography, arches, arches national park, d800, landscape, moab, nature, nikon, nikon d800, southwest, utah, vacation, beautiful, beauty, desert, double arch, land, long exposure, national park, night, night time, nightscape, parks, rock, rock formation, sandstone, trip, Arches National Park, Moab, UT"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/19899303/double-trouble-by-aaron-m>