D("foo.com", "none",
    SRV('_ntp._udp', 1, 100, 123, 'one.foo.com.'),
    SRV('_ntp._udp', 2, 100, 123, 'two'),
    SRV('_ntp._udp', 3, 100, 123, 'localhost'),
    SRV('_ntp._udp', 4, 100, 123, 'three.example.com.'),
    SRV('_ntp._udp', 0, 0, 1, 'zeros'),
);