public Collection<TriplesMap> getTripleMaps() { OBDAMappingTransformer transformer = new OBDAMappingTransformer(rdfFactory); transformer.setOntology(ontology); return splitMappingAxioms(this.ppMappingAxioms).stream() .map(a -> transformer.getTriplesMap(a, prefixmng)) .collect(Collectors.toList()); }