def ListChildPathInfos(self, client_id, path_type, components,
                         timestamp=None):
    """Lists path info records that correspond to children of given path.

    Args:
      client_id: An identifier string for a client.
      path_type: A type of a path to retrieve path information for.
      components: A tuple of path components of a path to retrieve child path
        information for.
      timestamp: If set, lists only descendants that existed only at that
        timestamp.

    Returns:
      A list of `rdf_objects.PathInfo` instances sorted by path components.
    """
    return self.ListDescendentPathInfos(
        client_id, path_type, components, max_depth=1, timestamp=timestamp)