(1) A proclamation
made in relation to any land to which this Part applies may be cancelled or
from time to time varied, or an error in any such proclamation may be
rectified, by a subsequent proclamation.
(2) A proclamation
such as is referred to in subsection (1) may make different provision for
different cases or classes of cases determined according to place, customary
use, persons, purpose, or other circumstance.