<http://schema.org/about>
"If I were to reference \"the big four\" in passing you would likely assume I was talking about cars, software companies, or maybe airlines. But unfortunately in this instance you'd be wrong. Scary as it may be, 75 percent of the seeds"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-food/the-politics-of-seeds-75-of-the-seed-marketplace-controlled-by-four-companies.html>