@abc.abstractmethod<EOL><INDENT>def get_maps_by_parent_genus_type(self, map_genus_type):<DEDENT>
return<EOL>
Gets a ``MapList`` corresponding to the given map genus ``Type`` and include any additional maps with genus types derived from the specified ``Type``.

        In plenary mode, the returned list contains all known maps or an
        error results. Otherwise, the returned list may contain only
        those maps that are accessible through this session.

        :param map_genus_type: a map genus type
        :type map_genus_type: ``osid.type.Type``
        :return: the returned ``Map`` list
        :rtype: ``osid.mapping.MapList``
        :raise: ``NullArgument`` -- ``map_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*