zone <string> [ <class> ] {
	type mirror;
	allow-notify { <address_match_element>; ... };
	allow-query { <address_match_element>; ... };
	allow-query-on { <address_match_element>; ... };
	allow-transfer [ port <integer> ] [ transport <string> ] { <address_match_element>; ... };
	allow-update-forwarding { <address_match_element>; ... };
	also-notify [ port <integer> ]  { ( <remote-servers> | <ipv4_address> [ port <integer> ] | <ipv6_address> [ port <integer> ] ) [ key <string> ] [ tls <string> ]; ... };
	alt-transfer-source ( <ipv4_address> | * ) ; // deprecated
	alt-transfer-source-v6 ( <ipv6_address> | * ) ; // deprecated
	check-names ( fail | warn | ignore );
	database <string>;
	file <quoted_string>;
	ixfr-from-differences <boolean>;
	journal <quoted_string>;
	masterfile-format ( raw | text );
	masterfile-style ( full | relative );
	max-ixfr-ratio ( unlimited | <percentage> );
	max-journal-size ( default | unlimited | <sizeval> );
	max-records <integer>;
	max-records-per-type <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>;
	max-types-per-name <integer>;
	min-refresh-time <integer>;
	min-retry-time <integer>;
	multi-master <boolean>;
	notify ( explicit | master-only | primary-only | <boolean> );
	notify-delay <integer>;
	notify-source ( <ipv4_address> | * ) ;
	notify-source-v6 ( <ipv6_address> | * ) ;
	primaries [ port <integer> ]  { ( <remote-servers> | <ipv4_address> [ port <integer> ] | <ipv6_address> [ port <integer> ] ) [ key <string> ] [ tls <string> ]; ... };
	request-expire <boolean>;
	request-ixfr <boolean>;
	transfer-source ( <ipv4_address> | * ) ;
	transfer-source-v6 ( <ipv6_address> | * ) ;
	try-tcp-refresh <boolean>;
	use-alt-transfer-source <boolean>; // deprecated
	zero-no-soa-ttl <boolean>;
	zone-statistics ( full | terse | none | <boolean> );
};
