<http://schema.org/about>
"We've written about Richard Branson and Virgin's foray into biofuels for aviation. There are some news on that front, but unfortunately they aren't all good. Virgin was never clear on what type of biofuel it was going to use, but it said it wanted"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/aviation/virgin-atlantic-to-demo-biofuel-flight-but-not-quite-there-yet.html>