<http://schema.org/vehicleEngine>
"MERCEDES  3.0L  6-cylinder turbo-diesel"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.rvusa.com/rvs-for-sale/2009/roadtrek-class-b-adventurous-class-b-used-tucson-arizona-85714-1989737>