docs: def save(self):
          """ Transfer the statements in this context over to the main store. """
          if self.parent.buffered:
              query = """
                  INSERT DATA { GRAPH %s { %s } }
              """
              query = query % (self.identifier.n3(),
                               self.graph.serialize(format='nt'))
              self.parent.graph.update(query)
              self.flush()
          else:
              self.meta.generate()