@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix obo_purl: <http://purl.obolibrary.org/obo/> . @prefix owl: <http://www.w3.org/2002/07/owl#> . obo_purl:BFO_0000051 a owl:ObjectProperty .