<http://schema.org/category>
"Travel Trailer"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.rvusa.com/rvs-for-sale/2017/keystone-travel-trailer-265rbiwe-island-kitchen-rear-bathroomoutdoor-kti-travel-trailer-new-turlock-california-95382-1941582>