493N/Aacl <string> { <address_match_element>; ... };
493N/A inet ( <ipv4_address> | <ipv6_address> | * ) [ port ( <integer> | *
493N/A ) ] allow { <address_match_element>; ... } [ keys { <string>;
493N/A unix <quoted_string> perm <integer> owner <integer> group <integer>
493N/A [ keys { <string>; ... } ];
493N/A category <string> { <string>; ... };
493N/A file <quoted_string> [ versions ( "unlimited" | <integer> )
493N/A print-category <boolean>;
493N/A print-severity <boolean>;
493N/A severity <log_severity>;
493N/A syslog <optional_facility>;
493N/A listen-on [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
493N/A [ port <integer> ]; ... };
493N/A search { <string>; ... };
493N/A view <string> <optional_class>;
493N/Amanaged-keys { <string> <string> <integer> <integer> <integer>
493N/A <quoted_string>; ... };
493N/Amasters <string> [ port <integer> ] { ( <masters> | <ipv4_address> [ port
493N/A <integer> ] | <ipv6_address> [ port <integer> ] ) [ key <string> ]; ... };
493N/A acache-cleaning-interval <integer>;
493N/A acache-enable <boolean>;
493N/A additional-from-auth <boolean>;
493N/A additional-from-cache <boolean>;
493N/A allow-notify { <address_match_element>; ... };
493N/A allow-query { <address_match_element>; ... };
493N/A allow-query-cache { <address_match_element>; ... };
493N/A allow-query-cache-on { <address_match_element>; ... };
493N/A allow-query-on { <address_match_element>; ... };
493N/A allow-recursion { <address_match_element>; ... };
493N/A allow-recursion-on { <address_match_element>; ... };
493N/A allow-transfer { <address_match_element>; ... };
493N/A allow-update { <address_match_element>; ... };
493N/A allow-update-forwarding { <address_match_element>; ... };
493N/A allow-v6-synthesis { <address_match_element>; ... }; // obsolete
493N/A also-notify [ port <integer> ] { ( <ipv4_address> | <ipv6_address>
493N/A ) [ port <integer> ]; ... };
493N/A alt-transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
493N/A alt-transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> |
493N/A auth-nxdomain <boolean>; // default changed
493N/A avoid-v4-udp-ports { <portrange>; ... };
493N/A avoid-v6-udp-ports { <portrange>; ... };
493N/A bindkeys-file <quoted_string>;
493N/A blackhole { <address_match_element>; ... };
493N/A cache-file <quoted_string>;
493N/A check-integrity <boolean>;
493N/A check-mx ( fail | warn | ignore );
493N/A check-mx-cname ( fail | warn | ignore );
493N/A check-names ( master | slave | response ) ( fail | warn | ignore );
493N/A check-sibling <boolean>;
493N/A check-srv-cname ( fail | warn | ignore );
493N/A check-wildcard <boolean>;
493N/A cleaning-interval <integer>;
493N/A clients-per-query <integer>;
493N/A deallocate-on-exit <boolean>; // obsolete
493N/A deny-answer-addresses { <address_match_element>; ... } [
493N/A except-from { <quoted_string>; ... } ];
493N/A deny-answer-aliases { <quoted_string>; ... } [ except-from {
493N/A <quoted_string>; ... } ];
493N/A directory <quoted_string>;
493N/A disable-algorithms <string> { <string>; ... };
493N/A disable-empty-zone <string>;
493N/A dnssec-accept-expired <boolean>;
493N/A dnssec-dnskey-kskonly <boolean>;
493N/A dnssec-enable <boolean>;
493N/A dnssec-lookaside <string> trust-anchor <string>;
493N/A dnssec-must-be-secure <string> <boolean>;
493N/A dnssec-secure-to-insecure <boolean>;
493N/A dnssec-validation <boolean>;
493N/A dual-stack-servers [ port <integer> ] { ( <quoted_string> [ port
493N/A <integer> ] | <ipv4_address> [ port <integer> ] |
493N/A <ipv6_address> [ port <integer> ] ); ... };
493N/A dump-file <quoted_string>;
493N/A edns-udp-size <integer>;
533N/A empty-contact <string>;
493N/A empty-zones-enable <boolean>;
493N/A fake-iquery <boolean>; // obsolete
493N/A fetch-glue <boolean>; // obsolete
493N/A flush-zones-on-shutdown <boolean>;
493N/A forward ( first | only );
493N/A forwarders [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
493N/A [ port <integer> ]; ... };
493N/A has-old-clients <boolean>; // obsolete
493N/A heartbeat-interval <integer>;
493N/A host-statistics <boolean>; // not implemented
493N/A host-statistics-max <integer>; // not implemented
493N/A hostname ( <quoted_string> | none );
493N/A interface-interval <integer>;
493N/A ixfr-from-differences <ixfrdiff>;
493N/A key-directory <quoted_string>;
493N/A listen-on [ port <integer> ] { <address_match_element>; ... };
493N/A listen-on-v6 [ port <integer> ] { <address_match_element>; ... };
493N/A maintain-ixfr-base <boolean>; // obsolete
493N/A masterfile-format ( text | raw );
493N/A match-mapped-addresses <boolean>;
493N/A max-acache-size <size_no_default>;
493N/A max-cache-size <size_no_default>;
493N/A max-cache-ttl <integer>;
493N/A max-clients-per-query <integer>;
493N/A max-ixfr-log-size <size>; // obsolete
493N/A max-journal-size <size_no_default>;
493N/A max-ncache-ttl <integer>;
493N/A max-refresh-time <integer>;
493N/A max-retry-time <integer>;
493N/A max-transfer-idle-in <integer>;
493N/A max-transfer-idle-out <integer>;
493N/A max-transfer-time-in <integer>;
493N/A max-transfer-time-out <integer>;
493N/A max-udp-size <integer>;
493N/A memstatistics <boolean>;
493N/A memstatistics-file <quoted_string>;
493N/A min-refresh-time <integer>;
493N/A min-retry-time <integer>;
493N/A min-roots <integer>; // not implemented
493N/A minimal-responses <boolean>;
493N/A multi-master <boolean>;
493N/A multiple-cnames <boolean>; // obsolete
493N/A named-xfer <quoted_string>; // obsolete
493N/A notify-delay <integer>;
493N/A notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
493N/A notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
493N/A notify-to-soa <boolean>;
493N/A nsec3-test-zone <boolean>; // test only
493N/A pid-file ( <quoted_string> | none );
493N/A preferred-glue <string>;
493N/A provide-ixfr <boolean>;
493N/A query-source <querysource4>;
493N/A query-source-v6 <querysource6>;
493N/A queryport-pool-ports <integer>; // obsolete
493N/A queryport-pool-updateinterval <integer>; // obsolete
493N/A random-device <quoted_string>;
493N/A recursing-file <quoted_string>;
493N/A recursive-clients <integer>;
493N/A request-ixfr <boolean>;
493N/A request-nsid <boolean>;
493N/A reserved-sockets <integer>;
493N/A rfc2308-type1 <boolean>; // not yet implemented
493N/A root-delegation-only [ exclude { <quoted_string>; ... } ];
493N/A rrset-order { [ class <string> ] [ type <string> ] [ name
493N/A <quoted_string> ] <string> <string>; ... };
493N/A serial-queries <integer>; // obsolete
493N/A serial-query-rate <integer>;
493N/A server-id ( <quoted_string> | none |;
493N/A session-keyalg <string>;
851N/A session-keyfile ( <quoted_string> | none );
851N/A session-keyname <string>;
493N/A sig-signing-nodes <integer>;
493N/A sig-signing-signatures <integer>;
493N/A sig-signing-type <integer>;
493N/A sig-validity-interval <integer> [ <integer> ];
493N/A sortlist { <address_match_element>; ... };
493N/A statistics-file <quoted_string>;
493N/A statistics-interval <integer>; // not yet implemented
493N/A suppress-initial-notify <boolean>; // not yet implemented
493N/A tcp-listen-queue <integer>;
493N/A tkey-dhkey <quoted_string> <integer>;
493N/A tkey-domain <quoted_string>;
591N/A tkey-gssapi-credential <quoted_string>;
591N/A topology { <address_match_element>; ... }; // not implemented
591N/A transfer-format ( many-answers | one-answer );
591N/A transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
591N/A transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
493N/A transfers-in <integer>;
493N/A transfers-out <integer>;
493N/A transfers-per-ns <integer>;
493N/A treat-cr-as-space <boolean>; // obsolete
493N/A try-tcp-refresh <boolean>;
493N/A update-check-ksk <boolean>;
493N/A use-alt-transfer-source <boolean>;
493N/A use-id-pool <boolean>; // obsolete
493N/A use-queryport-pool <boolean>; // obsolete
493N/A use-v4-udp-ports { <portrange>; ... };
493N/A use-v6-udp-ports { <portrange>; ... };
493N/A version ( <quoted_string> | none );
493N/A zero-no-soa-ttl <boolean>;
493N/A zero-no-soa-ttl-cache <boolean>;
493N/A zone-statistics <boolean>;
606N/A edns-udp-size <integer>;
493N/A max-udp-size <integer>;
493N/A notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
493N/A notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
493N/A provide-ixfr <boolean>;
493N/A query-source <querysource4>;
493N/A query-source-v6 <querysource6>;
493N/A request-ixfr <boolean>;
493N/A support-ixfr <boolean>; // obsolete
493N/A transfer-format ( many-answers | one-answer );
493N/A transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
493N/A transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
493N/A inet ( <ipv4_address> | <ipv6_address> | * ) [ port ( <integer> | *
493N/A ) ] [ allow { <address_match_element>; ... } ];
493N/Atrusted-keys { <string> <integer> <integer> <integer> <quoted_string>; ... };
493N/Aview <string> <optional_class> {
493N/A acache-cleaning-interval <integer>;
493N/A acache-enable <boolean>;
493N/A additional-from-auth <boolean>;
493N/A additional-from-cache <boolean>;
493N/A allow-notify { <address_match_element>; ... };
493N/A allow-query { <address_match_element>; ... };
493N/A allow-query-cache { <address_match_element>; ... };
493N/A allow-query-cache-on { <address_match_element>; ... };
493N/A allow-query-on { <address_match_element>; ... };
493N/A allow-recursion { <address_match_element>; ... };
493N/A allow-recursion-on { <address_match_element>; ... };
493N/A allow-transfer { <address_match_element>; ... };
493N/A allow-update { <address_match_element>; ... };
493N/A allow-update-forwarding { <address_match_element>; ... };
493N/A allow-v6-synthesis { <address_match_element>; ... }; // obsolete
493N/A also-notify [ port <integer> ] { ( <ipv4_address> | <ipv6_address>
493N/A ) [ port <integer> ]; ... };
493N/A alt-transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
493N/A alt-transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> |
493N/A auth-nxdomain <boolean>; // default changed
493N/A cache-file <quoted_string>;
493N/A check-integrity <boolean>;
493N/A check-mx ( fail | warn | ignore );
493N/A check-mx-cname ( fail | warn | ignore );
493N/A check-names ( master | slave | response ) ( fail | warn | ignore );
493N/A check-sibling <boolean>;
587N/A check-srv-cname ( fail | warn | ignore );
587N/A check-wildcard <boolean>;
587N/A cleaning-interval <integer>;
587N/A clients-per-query <integer>;
587N/A deny-answer-addresses { <address_match_element>; ... } [
587N/A except-from { <quoted_string>; ... } ];
587N/A deny-answer-aliases { <quoted_string>; ... } [ except-from {
587N/A <quoted_string>; ... } ];
493N/A disable-algorithms <string> { <string>; ... };
493N/A disable-empty-zone <string>;
493N/A dnssec-accept-expired <boolean>;
493N/A dnssec-dnskey-kskonly <boolean>;
493N/A dnssec-enable <boolean>;
493N/A dnssec-lookaside <string> trust-anchor <string>;
493N/A dnssec-must-be-secure <string> <boolean>;
493N/A dnssec-secure-to-insecure <boolean>;
493N/A dnssec-validation <boolean>;
493N/A dual-stack-servers [ port <integer> ] { ( <quoted_string> [ port
493N/A <integer> ] | <ipv4_address> [ port <integer> ] |
493N/A <ipv6_address> [ port <integer> ] ); ... };
493N/A edns-udp-size <integer>;
493N/A empty-contact <string>;
493N/A empty-zones-enable <boolean>;
851N/A fetch-glue <boolean>; // obsolete
493N/A forward ( first | only );
493N/A forwarders [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
493N/A [ port <integer> ]; ... };
493N/A ixfr-from-differences <ixfrdiff>;
493N/A key-directory <quoted_string>;
493N/A maintain-ixfr-base <boolean>; // obsolete
493N/A managed-keys { <string> <string> <integer> <integer> <integer>
493N/A <quoted_string>; ... };
493N/A masterfile-format ( text | raw );
493N/A match-clients { <address_match_element>; ... };
493N/A match-destinations { <address_match_element>; ... };
493N/A match-recursive-only <boolean>;
493N/A max-acache-size <size_no_default>;
493N/A max-cache-size <size_no_default>;
493N/A max-cache-ttl <integer>;
493N/A max-clients-per-query <integer>;
493N/A max-ixfr-log-size <size>; // obsolete
493N/A max-journal-size <size_no_default>;
493N/A max-ncache-ttl <integer>;
493N/A max-refresh-time <integer>;
493N/A max-retry-time <integer>;
493N/A max-transfer-idle-in <integer>;
493N/A max-transfer-idle-out <integer>;
493N/A max-transfer-time-in <integer>;
493N/A max-transfer-time-out <integer>;
493N/A max-udp-size <integer>;
493N/A min-refresh-time <integer>;
493N/A min-retry-time <integer>;
493N/A min-roots <integer>; // not implemented
493N/A minimal-responses <boolean>;
493N/A multi-master <boolean>;
493N/A notify-delay <integer>;
591N/A notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
591N/A notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
493N/A notify-to-soa <boolean>;
493N/A nsec3-test-zone <boolean>; // test only
493N/A preferred-glue <string>;
493N/A provide-ixfr <boolean>;
493N/A query-source <querysource4>;
493N/A query-source-v6 <querysource6>;
493N/A queryport-pool-ports <integer>; // obsolete
493N/A queryport-pool-updateinterval <integer>; // obsolete
493N/A request-ixfr <boolean>;
493N/A request-nsid <boolean>;
493N/A rfc2308-type1 <boolean>; // not yet implemented
493N/A root-delegation-only [ exclude { <quoted_string>; ... } ];
493N/A rrset-order { [ class <string> ] [ type <string> ] [ name
493N/A <quoted_string> ] <string> <string>; ... };
493N/A edns-udp-size <integer>;
493N/A max-udp-size <integer>;
493N/A notify-source ( <ipv4_address> | * ) [ port ( <integer> | *
493N/A notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer>
493N/A provide-ixfr <boolean>;
493N/A query-source <querysource4>;
493N/A query-source-v6 <querysource6>;
493N/A request-ixfr <boolean>;
493N/A support-ixfr <boolean>; // obsolete
493N/A transfer-format ( many-answers | one-answer );
493N/A transfer-source ( <ipv4_address> | * ) [ port ( <integer> |
493N/A transfer-source-v6 ( <ipv6_address> | * ) [ port (
493N/A sig-signing-nodes <integer>;
493N/A sig-signing-signatures <integer>;
493N/A sig-signing-type <integer>;
493N/A sig-validity-interval <integer> [ <integer> ];
493N/A sortlist { <address_match_element>; ... };
493N/A suppress-initial-notify <boolean>; // not yet implemented
493N/A topology { <address_match_element>; ... }; // not implemented
493N/A transfer-format ( many-answers | one-answer );
493N/A transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
591N/A transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
591N/A trusted-keys { <string> <integer> <integer> <integer>
591N/A <quoted_string>; ... };
591N/A try-tcp-refresh <boolean>;
493N/A update-check-ksk <boolean>;
493N/A use-alt-transfer-source <boolean>;
493N/A use-queryport-pool <boolean>; // obsolete
493N/A zero-no-soa-ttl <boolean>;
493N/A zero-no-soa-ttl-cache <boolean>;
606N/A zone <string> <optional_class> {
493N/A allow-notify { <address_match_element>; ... };
493N/A allow-query { <address_match_element>; ... };
493N/A allow-query-on { <address_match_element>; ... };
493N/A allow-transfer { <address_match_element>; ... };
493N/A allow-update { <address_match_element>; ... };
493N/A allow-update-forwarding { <address_match_element>; ... };
493N/A also-notify [ port <integer> ] { ( <ipv4_address> |
493N/A <ipv6_address> ) [ port <integer> ]; ... };
493N/A alt-transfer-source ( <ipv4_address> | * ) [ port (
493N/A alt-transfer-source-v6 ( <ipv6_address> | * ) [ port (
493N/A auto-dnssec ( allow | maintain | create | off );
493N/A check-integrity <boolean>;
493N/A check-mx ( fail | warn | ignore );
493N/A check-mx-cname ( fail | warn | ignore );
493N/A check-names ( fail | warn | ignore );
493N/A check-sibling <boolean>;
493N/A check-srv-cname ( fail | warn | ignore );
493N/A check-wildcard <boolean>;
493N/A delegation-only <boolean>;
493N/A dnssec-dnskey-kskonly <boolean>;
493N/A dnssec-secure-to-insecure <boolean>;
493N/A forward ( first | only );
493N/A forwarders [ port <integer> ] { ( <ipv4_address> |
493N/A <ipv6_address> ) [ port <integer> ]; ... };
493N/A ixfr-base <quoted_string>; // obsolete
493N/A ixfr-from-differences <boolean>;
493N/A ixfr-tmp-file <quoted_string>; // obsolete
493N/A journal <quoted_string>;
493N/A key-directory <quoted_string>;
493N/A maintain-ixfr-base <boolean>; // obsolete
493N/A masterfile-format ( text | raw );
493N/A masters [ port <integer> ] { ( <masters> | <ipv4_address> [
493N/A port <integer> ] | <ipv6_address> [ port <integer> ] )
493N/A [ key <string> ]; ... };
493N/A max-ixfr-log-size <size>; // obsolete
493N/A max-journal-size <size_no_default>;
493N/A max-refresh-time <integer>;
493N/A max-retry-time <integer>;
493N/A max-transfer-idle-in <integer>;
493N/A max-transfer-idle-out <integer>;
493N/A max-transfer-time-in <integer>;
493N/A max-transfer-time-out <integer>;
493N/A min-refresh-time <integer>;
493N/A min-retry-time <integer>;
493N/A multi-master <boolean>;
493N/A notify-delay <integer>;
493N/A notify-source ( <ipv4_address> | * ) [ port ( <integer> | *
493N/A notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer>
493N/A notify-to-soa <boolean>;
493N/A nsec3-test-zone <boolean>; // test only
493N/A pubkey <integer> <integer> <integer>
493N/A <quoted_string>; // obsolete
493N/A sig-signing-nodes <integer>;
493N/A sig-signing-signatures <integer>;
493N/A sig-signing-type <integer>;
493N/A sig-validity-interval <integer> [ <integer> ];
493N/A transfer-source ( <ipv4_address> | * ) [ port ( <integer> |
493N/A transfer-source-v6 ( <ipv6_address> | * ) [ port (
493N/A try-tcp-refresh <boolean>;
493N/A type ( master | slave | stub | hint | forward |
493N/A update-check-ksk <boolean>;
493N/A update-policy ( local | { ( grant | deny ) <string> ( name
493N/A | subdomain | wildcard | self | selfsub | selfwild |
493N/A krb5-self | ms-self | krb5-subdomain | ms-subdomain |
493N/A tcp-self | 6to4-self | zonesub ) [ <string> ]
493N/A use-alt-transfer-source <boolean>;
493N/A zero-no-soa-ttl <boolean>;
493N/A zone-statistics <boolean>;
493N/A zone-statistics <boolean>;
493N/Azone <string> <optional_class> {
493N/A allow-notify { <address_match_element>; ... };
493N/A allow-query { <address_match_element>; ... };
493N/A allow-query-on { <address_match_element>; ... };
493N/A allow-transfer { <address_match_element>; ... };
493N/A allow-update { <address_match_element>; ... };
493N/A allow-update-forwarding { <address_match_element>; ... };
493N/A also-notify [ port <integer> ] { ( <ipv4_address> | <ipv6_address>
493N/A ) [ port <integer> ]; ... };
493N/A alt-transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
493N/A alt-transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> |
493N/A auto-dnssec ( allow | maintain | create | off );
493N/A check-integrity <boolean>;
493N/A check-mx ( fail | warn | ignore );
493N/A check-mx-cname ( fail | warn | ignore );
493N/A check-names ( fail | warn | ignore );
493N/A check-sibling <boolean>;
493N/A check-srv-cname ( fail | warn | ignore );
493N/A check-wildcard <boolean>;
493N/A delegation-only <boolean>;
606N/A dnssec-dnskey-kskonly <boolean>;
851N/A dnssec-secure-to-insecure <boolean>;
493N/A forward ( first | only );
919N/A forwarders [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
919N/A [ port <integer> ]; ... };
919N/A ixfr-base <quoted_string>; // obsolete
919N/A ixfr-from-differences <boolean>;
919N/A ixfr-tmp-file <quoted_string>; // obsolete
493N/A journal <quoted_string>;
919N/A key-directory <quoted_string>;
919N/A maintain-ixfr-base <boolean>; // obsolete
919N/A masterfile-format ( text | raw );
493N/A masters [ port <integer> ] { ( <masters> | <ipv4_address> [ port
919N/A <integer> ] | <ipv6_address> [ port <integer> ] ) [ key
919N/A max-ixfr-log-size <size>; // obsolete
919N/A max-journal-size <size_no_default>;
919N/A max-refresh-time <integer>;
919N/A max-retry-time <integer>;
919N/A 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>;
notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
nsec3-test-zone <boolean>; // test only
pubkey <integer> <integer> <integer> <quoted_string>; // obsolete
sig-signing-nodes <integer>;
sig-signing-signatures <integer>;
sig-signing-type <integer>;
sig-validity-interval <integer> [ <integer> ];
transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
try-tcp-refresh <boolean>;
type ( master | slave | stub | hint | forward | delegation-only );
update-check-ksk <boolean>;
update-policy ( local | { ( grant | deny ) <string> ( name |
subdomain | wildcard | self | selfsub | selfwild | krb5-self |
ms-self | krb5-subdomain | ms-subdomain | tcp-self | 6to4-self
| zonesub ) [ <string> ] <rrtypelist>; ... };
use-alt-transfer-source <boolean>;
zero-no-soa-ttl <boolean>;
zone-statistics <boolean>;