<http://schema.org/about>
"As we've mentioned before, Google is quite interested in plug-in hybrids. For those not familiar with the technology, a plug-in hybrid is just like a regular hybrid - it can be powered by either a gasoline engine or electrical motor, or both at the"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/cars/hows-the-google-plug-in-hybrid-fleet-doing.html>