<http://schema.org/keywords>
"France, abstract, background, country side, countryside, crop, ears, field, france, golden, grain, harvest, pattern, ripe, summer, sun, sunshine, texture, wheat"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/18788181/field-of-wheat-by-heather-aplin>