code: def history(self):
          '''Get history/version information for this datastream and
          return as an instance of
          :class:`~eulfedora.xml.DatastreamHistory`.'''
          r = self.obj.api.getDatastreamHistory(self.obj.pid, self.id, format='xml')
          return parse_xml_object(DatastreamHistory, r.content, r.urlf history(self):
          '''Get history/version information for this datastream and
          return as an instance of
          :class:`~eulfedora.xml.DatastreamHistory`.'''
          r = self.obj.api.getDatastreamHistory(self.obj.pid, self.id, format='xml')
          return parse_xml_object(DatastreamHistory, r.content, r.url)
docs: Get history/version information for this datastream and
          return as an instance of
          :class:`~eulfedora.xml.DatastreamHistory`.