docs: def download_object_metadata(self, mapobject_type_name, plate_name=None,
              well_name=None, well_pos_y=None, well_pos_x=None, tpoint=None):
          '''Downloads metadata for the given object type, which describes the
          position of each segmented object on the map.
  
          Parameters
          ----------
          mapobject_type_name: str
              type of the segmented objects
          plate_name: str, optional
              name of the plate
          well_name: str, optional
              name of the well
          well_pos_y: int, optional
              y-position of the site relative to the well grid
          well_pos_x: int, optional
              x-position of the site relative to the well grid
          tpoint: int, optional
              zero-based time point index
  
          Returns
          -------
          pandas.DataFrame
              *n*x*p* dataframe, where *n* are number of objects and *p* number
              of metadata attributes
  
          See also
          --------
          :func:`tmserver.api.feature.get_metadata`
          '''
          res = self._download_object_metadata(
              mapobject_type_name, plate_name, well_name, well_pos_y, well_pos_x,
              tpoint
          )
          file_obj = StringIO(res.content.decode('utf-8'))
          try:
              return pd.read_csv(file_obj)
          except EmptyDataError:
              return pd.DataFrame()