zone string [ class ] { type ( slave | secondary ); allow-notify { address_match_element; ... }; allow-query { address_match_element; ... }; allow-query-on { address_match_element; ... }; allow-transfer { address_match_element; ... }; allow-update-forwarding { address_match_element; ... }; also-notify [ port integer ] [ dscp integer ] { ( masters | ipv4_address [ port integer ] | ipv6_address [ port integer ] ) [ key string ]; ... }; alt-transfer-source ( ipv4_address | * ) [ port ( integer | * ) ] [ dscp integer ]; alt-transfer-source-v6 ( ipv6_address | * ) [ port ( integer | * ) ] [ dscp integer ]; auto-dnssec ( allow | maintain | off ); check-names ( fail | warn | ignore ); database string; dialup ( notify | notify-passive | passive | refresh | boolean ); dlz string; dnssec-dnskey-kskonly boolean; dnssec-loadkeys-interval integer; dnssec-update-mode ( maintain | no-resign ); file quoted_string; forward ( first | only ); forwarders [ port integer ] [ dscp integer ] { ( ipv4_address | ipv6_address ) [ port integer ] [ dscp integer ]; ... }; inline-signing boolean; ixfr-from-differences boolean; journal quoted_string; key-directory quoted_string; masterfile-format ( map | raw | text ); masterfile-style ( full | relative ); masters [ port integer ] [ dscp integer ] { ( masters | ipv4_address [ port integer ] | ipv6_address [ port integer ] ) [ key string ]; ... }; max-journal-size ( unlimited | sizeval ); max-records integer; max-refresh-time integer; max-retry-time integer; max-transfer-idle-in integer; max-transfer-idle-out integer; max-transfer-time-in integer; max-transfer-time-out integer; min-refresh-time integer; min-retry-time integer; multi-master boolean; notify ( explicit | master-only | boolean ); notify-delay integer; notify-source ( ipv4_address | * ) [ port ( integer | * ) ] [ dscp integer ]; notify-source-v6 ( ipv6_address | * ) [ port ( integer | * ) ] [ dscp integer ]; notify-to-soa boolean; request-expire boolean; request-ixfr boolean; sig-signing-nodes integer; sig-signing-signatures integer; sig-signing-type integer; sig-validity-interval integer [ integer ]; transfer-source ( ipv4_address | * ) [ port ( integer | * ) ] [ dscp integer ]; transfer-source-v6 ( ipv6_address | * ) [ port ( integer | * ) ] [ dscp integer ]; try-tcp-refresh boolean; update-check-ksk boolean; use-alt-transfer-source boolean; zero-no-soa-ttl boolean; zone-statistics ( full | terse | none | boolean ); };