<http://schema.org/category>
"primary"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ticketweb.com/t3/sale/SaleEventDetail?dispatch=loadSelectionData&eventId=3449604&REFERRAL_ID=tmfeedbuyat139690&wt.mc_id=aff_BUYAT_139690&camefrom=CFC_BUYAT_139690>