code: def addFeatureSet(self, featureSet):
          
          id_ = featureSet.getId()
          self._featureSetIdMap[id_] = featureSet
          self._featureSetIds.append(id_)
          name = featureSet.getLocalId()
          self._featureSetNameMap[name] = featureSet
docs: Adds the specified featureSet to this dataset.