alter function uuid_nil() immutable;
alter function uuid_ns_dns() immutable;
alter function uuid_ns_oid() immutable;
alter function uuid_ns_url() immutable;
alter function uuid_ns_x500() immutable;
alter function uuid_url(text) immutable;
alter function uuid_dns(text) immutable;
alter function uuid_oid(text) immutable;
alter function uuid_x500(text) immutable;
