Describe((?cost, ?vpsPE, ?textdata),
         BGP( ?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://visibleprices.org/vp-schema#Quotation> .
              ?s <http://visibleprices.org/vp-schema#textData> ?textdata .
              ?s <http://visibleprices.org/vp-schema#hasPriceExpression> ?vpsPE .
              ?vpsPE <http://visibleprices.org/vp-schema#hasNormalizedValue> ?cost .
              ?vpsPE <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://visibleprices.org/vp-schema#PriceExpression>))