@classmethod
  def extract(cls, path, outdir):
    raise NotImplementedError()
save_to_xml(obj : object, filename: str, tags: dict,
dataset/ETHPy150Open pantsbuild/pants/src/python/pants/fs/archive.py/Archiver.extract--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/db/versions/v1_0_3/persistence/__init__.py/DAOList.save_to_xml