code: def query(self, query):
      '''Returns a sequence of objects matching criteria expressed in `query`'''
      query = query.copy()
      query.key = self._transform(query.key)
      return self.child_datastore.query(queryf query(self, query):
      '''Returns a sequence of objects matching criteria expressed in `query`'''
      query = query.copy()
      query.key = self._transform(query.key)
      return self.child_datastore.query(query)
docs: Returns a sequence of objects matching criteria expressed in `query`