<http://schema.org/keywords>
"autumn, trees, leaves, summer, autumnal, changing, fall, leaf, england, countryside, falling, colours, hertfordshire, change, seasons"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/10064739/autumn-is-a-second-spring-by-robert-k-baggs>