Project(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),
        {?textdata, ?vpsPE})