example. 86400 IN SOA ns1 admin 2018031900 ( 1800 900 604800 86400 ) 86400 IN NS ns1 86400 IN NS ns2 86400 IN ZONEMD 2018031900 1 1 ( 31cefb03814f5062 ad12fa951ba0ef5f 8da6ae354a415767 246f7dc932ceb1e7 42a2108f529db6a3 3a11c01493de358d ) ns1 3600 IN A 203.0.113.63 ns2 3600 IN AAAA 2001:db8::63 occluded.sub 7200 IN TXT "I'm occluded but must be digested" sub 7200 IN NS ns1 duplicate 300 IN TXT "I must be digested just once" duplicate 300 IN TXT "I must be digested just once" foo.test. 555 IN TXT "out-of-zone data must be excluded" non-apex 900 IN ZONEMD 2018031900 1 1 ( 616c6c6f77656420 6275742069676e6f 7265642e20616c6c 6f77656420627574 2069676e6f726564 2e20616c6c6f7765 )