public boolean isUnknown() {
        return pattern.isUnknown() || entry.isUnknown();
    }
@Test
    public void testUnknowns() {
        assertFalse(ACL1.isUnknown());
        assertFalse(ACL2.isUnknown());
        assertFalse(ACL3.isUnknown());
        assertFalse(ANY_ANONYMOUS.isUnknown());
        assertFalse(ANY_DENY.isUnknown());
        assertFalse(ANY_MYTOPIC.isUnknown());
        assertTrue(UNKNOWN_ACL.isUnknown());
    }