@prefix ns1: . @prefix ns2: . @prefix rdfs: . @prefix xsd: . a ns1:Event ; rdfs:label "San Francisco Symphony" ; ns2:conductor ; ns2:orchestra ; ns1:description "choir and orchestra performance" ; ns1:location ; ns1:organizer ; ns1:startDate "2008-09-26T20:00:00"^^xsd:dateTime ; ns1:subEvent , , ; rdfs:comment "There was a pre-concert talk at 7 PM with Walter Frisch, Professor of Music, Columbia University" .