def graph(self, identifier=None):
        if identifier is None:
            from rdflib.term import rdflib_skolem_genid
            self.bind(
                "genid", "http://rdflib.net" + rdflib_skolem_genid,
                override=False)
            identifier = BNode().skolemize()

        g = self._graph(identifier)

        self.store.add_graph(g)
        return g
dataset/ETHPy150Open RDFLib/rdflib/rdflib/graph.py/Dataset.graph/original