<http://schema.org/keywords>
"\u00E2\u0080\u009Con the nature of things\u00E2\u0080\u009D (\u00E2\u0080\u009Dde rerum natura\u00E2\u0080\u009D)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.newyorker.com/magazine/2011/08/08/the-answer-man-stephen-greenblatt>