code: def _get_coordinates_for_dataset_key(self, dsid):
          
          ds_info = self.ids[dsid]
          cids = []
  
          for cinfo in ds_info.get('coordinates', []):
              if not isinstance(cinfo, dict):
                  cinfo = {'name': cinfo}
  
              cinfo['resolution'] = ds_info['resolution']
              if 'polarization' in ds_info:
                  cinfo['polarization'] = ds_info['polarization']
              cid = DatasetID(**cinfo)
              cids.append(self.get_dataset_key(cid))
  
          return cids
docs: Get the coordinate dataset keys for *dsid*.