code: def _make_stream_features(self):
          
          features = ElementTree.Element(FEATURES_TAG)
          for handler in self._stream_feature_handlers:
              handler.make_stream_features(self, features)
          return features
docs: Create the <features/> element for the stream.
  
          [receving entity only]
  
          :returns: new <features/> element
          :returntype: :etree:`ElementTree.Element`