<http://schema.org/about>
"Earthworms basically do three things with their time: eat, poop and have sex.  As a result, earthworms are excellent for"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/pop-quiz-how-much-poop-does-a-worm-poop.html>