<http://schema.org/keywords>
"sea, swans, water, white, couple, reflection, love, birds, animals, harmony, tango, relationship, fidelity, emotions, lake"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/1726148/tango-of-the-swans-by-joachim-g-pinkawa>