<http://schema.org/about>
"What to do with the extra green beans that can never be eaten...  Food swapping:  we all do it informally, passing on extra vegetables, sometimes in return for a jar of homemade jam or chutney.  But in England, it's becoming much more organized.  There"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-food/lets-make-a-deal-food-swapping-becomes-trendy-in-london.html>