<http://schema.org/about>
"Zoos have come a long way from the wildlife prisons of the past, but a few still cling to outdated, inhumane practices."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/photos/6-of-the-saddest-zoos-in-the-world/pyongyang-central-zoo>