This is a summary of the named.conf options supported by 
this version of BIND 9.

acl <string> { <address_match_element>; ... };

controls {
        inet ( <ipv4_address> | <ipv6_address> | * ) [ port ( <integer> | *
            ) ] allow { <address_match_element>; ... } [ keys { <string>;
            ... } ];
        unix <quoted_string> perm <integer> owner <integer> group <integer>
            [ keys { <string>; ... } ];
};

dlz <string> {
        database <string>;
};

key <string> {
        algorithm <string>;
        secret <string>;
};

logging {
        category <string> { <string>; ... };
        channel <string> {
                file <quoted_string> [ versions ( "unlimited" | <integer> )
                    ] [ size <size> ];
                null;
                print-category <boolean>;
                print-severity <boolean>;
                print-time <boolean>;
                severity <log_severity>;
                stderr;
                syslog <optional_facility>;
        };
};

lwres {
        listen-on [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
            [ port <integer> ]; ... };
        ndots <integer>;
        search { <string>; ... };
        view <string> <optional_class>;
};

managed-keys { <string> <string> <integer> <integer> <integer>
    <quoted_string>; ... };

masters <string> [ port <integer> ] { ( <masters> | <ipv4_address> [ port
    <integer> ] | <ipv6_address> [ port <integer> ] ) [ key <string> ]; ... };

options {
        acache-cleaning-interval <integer>;
        acache-enable <boolean>;
        additional-from-auth <boolean>;
        additional-from-cache <boolean>;
        allow-new-zones <boolean>;
        allow-notify { <address_match_element>; ... };
        allow-query { <address_match_element>; ... };
        allow-query-cache { <address_match_element>; ... };
        allow-query-cache-on { <address_match_element>; ... };
        allow-query-on { <address_match_element>; ... };
        allow-recursion { <address_match_element>; ... };
        allow-recursion-on { <address_match_element>; ... };
        allow-transfer { <address_match_element>; ... };
        allow-update { <address_match_element>; ... };
        allow-update-forwarding { <address_match_element>; ... };
        allow-v6-synthesis { <address_match_element>; ... }; // obsolete
        also-notify [ port <integer> ] { ( <ipv4_address> | <ipv6_address>
            ) [ port <integer> ]; ... };
        alt-transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        alt-transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> |
            * ) ];
        attach-cache <string>;
        auth-nxdomain <boolean>; // default changed
        auto-dnssec ( allow | maintain | off );
        avoid-v4-udp-ports { <portrange>; ... };
        avoid-v6-udp-ports { <portrange>; ... };
        bindkeys-file <quoted_string>;
        blackhole { <address_match_element>; ... };
        cache-file <quoted_string>;
        check-dup-records ( fail | warn | ignore );
        check-integrity <boolean>;
        check-mx ( fail | warn | ignore );
        check-mx-cname ( fail | warn | ignore );
        check-names ( master | slave | response ) ( fail | warn | ignore );
        check-sibling <boolean>;
        check-srv-cname ( fail | warn | ignore );
        check-wildcard <boolean>;
        cleaning-interval <integer>;
        clients-per-query <integer>;
        coresize <size>;
        datasize <size>;
        deallocate-on-exit <boolean>; // obsolete
        deny-answer-addresses { <address_match_element>; ... } [
            except-from { <quoted_string>; ... } ];
        deny-answer-aliases { <quoted_string>; ... } [ except-from {
            <quoted_string>; ... } ];
        dialup <dialuptype>;
        directory <quoted_string>;
        disable-algorithms <string> { <string>; ... };
        disable-empty-zone <string>;
        dns64 <netprefix> {
                break-dnssec <boolean>;
                clients { <address_match_element>; ... };
                exclude { <address_match_element>; ... };
                mapped { <address_match_element>; ... };
                recursive-only <boolean>;
                suffix <ipv6_address>;
        };
        dns64-contact <string>;
        dns64-server <string>;
        dnssec-accept-expired <boolean>;
        dnssec-dnskey-kskonly <boolean>;
        dnssec-enable <boolean>;
        dnssec-lookaside ( <string> trust-anchor <string> | auto | no );
        dnssec-must-be-secure <string> <boolean>;
        dnssec-secure-to-insecure <boolean>;
        dnssec-validation ( yes | no | auto );
        dual-stack-servers [ port <integer> ] { ( <quoted_string> [ port
            <integer> ] | <ipv4_address> [ port <integer> ] |
            <ipv6_address> [ port <integer> ] ); ... };
        dump-file <quoted_string>;
        edns-udp-size <integer>;
        empty-contact <string>;
        empty-server <string>;
        empty-zones-enable <boolean>;
        fake-iquery <boolean>; // obsolete
        fetch-glue <boolean>; // obsolete
        files <size>;
        filter-aaaa { <address_match_element>; ... }; // not configured
        filter-aaaa-on-v4 <v4_aaaa>; // not configured
        flush-zones-on-shutdown <boolean>;
        forward ( first | only );
        forwarders [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
            [ port <integer> ]; ... };
        has-old-clients <boolean>; // obsolete
        heartbeat-interval <integer>;
        host-statistics <boolean>; // not implemented
        host-statistics-max <integer>; // not implemented
        hostname ( <quoted_string> | none );
        interface-interval <integer>;
        ixfr-from-differences <ixfrdiff>;
        key-directory <quoted_string>;
        lame-ttl <integer>;
        listen-on [ port <integer> ] { <address_match_element>; ... };
        listen-on-v6 [ port <integer> ] { <address_match_element>; ... };
        maintain-ixfr-base <boolean>; // obsolete
        managed-keys-directory <quoted_string>;
        masterfile-format ( text | raw );
        match-mapped-addresses <boolean>;
        max-acache-size <size_no_default>;
        max-cache-size <size_no_default>;
        max-cache-ttl <integer>;
        max-clients-per-query <integer>;
        max-ixfr-log-size <size>; // obsolete
        max-journal-size <size_no_default>;
        max-ncache-ttl <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-udp-size <integer>;
        memstatistics <boolean>;
        memstatistics-file <quoted_string>;
        min-refresh-time <integer>;
        min-retry-time <integer>;
        min-roots <integer>; // not implemented
        minimal-responses <boolean>;
        multi-master <boolean>;
        multiple-cnames <boolean>; // obsolete
        named-xfer <quoted_string>; // obsolete
        notify <notifytype>;
        notify-delay <integer>;
        notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
        notify-to-soa <boolean>;
        nsec3-test-zone <boolean>; // test only
        pid-file ( <quoted_string> | none );
        port <integer>;
        preferred-glue <string>;
        provide-ixfr <boolean>;
        query-source <querysource4>;
        query-source-v6 <querysource6>;
        querylog <boolean>;
        queryport-pool-ports <integer>; // obsolete
        queryport-pool-updateinterval <integer>; // obsolete
        random-device <quoted_string>;
        recursing-file <quoted_string>;
        recursion <boolean>;
        recursive-clients <integer>;
        request-ixfr <boolean>;
        request-nsid <boolean>;
        reserved-sockets <integer>;
        resolver-query-timeout <integer>;
        response-policy {
                zone <string> [ policy ( given | disabled | passthru |
                    no-op | nxdomain | nodata | cname <domain> ) ];
        };
        rfc2308-type1 <boolean>; // not yet implemented
        root-delegation-only [ exclude { <quoted_string>; ... } ];
        rrset-order { [ class <string> ] [ type <string> ] [ name
            <quoted_string> ] <string> <string>; ... };
        secroots-file <quoted_string>;
        serial-queries <integer>; // obsolete
        serial-query-rate <integer>;
        server-id ( <quoted_string> | none | hostname );
        session-keyalg <string>;
        session-keyfile ( <quoted_string> | none );
        session-keyname <string>;
        sig-signing-nodes <integer>;
        sig-signing-signatures <integer>;
        sig-signing-type <integer>;
        sig-validity-interval <integer> [ <integer> ];
        sortlist { <address_match_element>; ... };
        stacksize <size>;
        statistics-file <quoted_string>;
        statistics-interval <integer>; // not yet implemented
        suppress-initial-notify <boolean>; // not yet implemented
        tcp-clients <integer>;
        tcp-listen-queue <integer>;
        tkey-dhkey <quoted_string> <integer>;
        tkey-domain <quoted_string>;
        tkey-gssapi-credential <quoted_string>;
        tkey-gssapi-keytab <quoted_string>;
        topology { <address_match_element>; ... }; // not implemented
        transfer-format ( many-answers | one-answer );
        transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
        transfers-in <integer>;
        transfers-out <integer>;
        transfers-per-ns <integer>;
        treat-cr-as-space <boolean>; // obsolete
        try-tcp-refresh <boolean>;
        update-check-ksk <boolean>;
        use-alt-transfer-source <boolean>;
        use-id-pool <boolean>; // obsolete
        use-ixfr <boolean>;
        use-queryport-pool <boolean>; // obsolete
        use-v4-udp-ports { <portrange>; ... };
        use-v6-udp-ports { <portrange>; ... };
        version ( <quoted_string> | none );
        zero-no-soa-ttl <boolean>;
        zero-no-soa-ttl-cache <boolean>;
        zone-statistics <boolean>;
};

server <netprefix> {
        bogus <boolean>;
        edns <boolean>;
        edns-udp-size <integer>;
        keys <server_key>;
        max-udp-size <integer>;
        notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
        provide-ixfr <boolean>;
        query-source <querysource4>;
        query-source-v6 <querysource6>;
        request-ixfr <boolean>;
        support-ixfr <boolean>; // obsolete
        transfer-format ( many-answers | one-answer );
        transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
        transfers <integer>;
};

statistics-channels {
        inet ( <ipv4_address> | <ipv6_address> | * ) [ port ( <integer> | *
            ) ] [ allow { <address_match_element>; ... } ];
};

trusted-keys { <string> <integer> <integer> <integer> <quoted_string>; ... };

view <string> <optional_class> {
        acache-cleaning-interval <integer>;
        acache-enable <boolean>;
        additional-from-auth <boolean>;
        additional-from-cache <boolean>;
        allow-new-zones <boolean>;
        allow-notify { <address_match_element>; ... };
        allow-query { <address_match_element>; ... };
        allow-query-cache { <address_match_element>; ... };
        allow-query-cache-on { <address_match_element>; ... };
        allow-query-on { <address_match_element>; ... };
        allow-recursion { <address_match_element>; ... };
        allow-recursion-on { <address_match_element>; ... };
        allow-transfer { <address_match_element>; ... };
        allow-update { <address_match_element>; ... };
        allow-update-forwarding { <address_match_element>; ... };
        allow-v6-synthesis { <address_match_element>; ... }; // obsolete
        also-notify [ port <integer> ] { ( <ipv4_address> | <ipv6_address>
            ) [ port <integer> ]; ... };
        alt-transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        alt-transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> |
            * ) ];
        attach-cache <string>;
        auth-nxdomain <boolean>; // default changed
        auto-dnssec ( allow | maintain | off );
        cache-file <quoted_string>;
        check-dup-records ( fail | warn | ignore );
        check-integrity <boolean>;
        check-mx ( fail | warn | ignore );
        check-mx-cname ( fail | warn | ignore );
        check-names ( master | slave | response ) ( fail | warn | ignore );
        check-sibling <boolean>;
        check-srv-cname ( fail | warn | ignore );
        check-wildcard <boolean>;
        cleaning-interval <integer>;
        clients-per-query <integer>;
        database <string>;
        deny-answer-addresses { <address_match_element>; ... } [
            except-from { <quoted_string>; ... } ];
        deny-answer-aliases { <quoted_string>; ... } [ except-from {
            <quoted_string>; ... } ];
        dialup <dialuptype>;
        disable-algorithms <string> { <string>; ... };
        disable-empty-zone <string>;
        dlz <string> {
                database <string>;
        };
        dns64 <netprefix> {
                break-dnssec <boolean>;
                clients { <address_match_element>; ... };
                exclude { <address_match_element>; ... };
                mapped { <address_match_element>; ... };
                recursive-only <boolean>;
                suffix <ipv6_address>;
        };
        dns64-contact <string>;
        dns64-server <string>;
        dnssec-accept-expired <boolean>;
        dnssec-dnskey-kskonly <boolean>;
        dnssec-enable <boolean>;
        dnssec-lookaside ( <string> trust-anchor <string> | auto | no );
        dnssec-must-be-secure <string> <boolean>;
        dnssec-secure-to-insecure <boolean>;
        dnssec-validation ( yes | no | auto );
        dual-stack-servers [ port <integer> ] { ( <quoted_string> [ port
            <integer> ] | <ipv4_address> [ port <integer> ] |
            <ipv6_address> [ port <integer> ] ); ... };
        edns-udp-size <integer>;
        empty-contact <string>;
        empty-server <string>;
        empty-zones-enable <boolean>;
        fetch-glue <boolean>; // obsolete
        filter-aaaa { <address_match_element>; ... }; // not configured
        filter-aaaa-on-v4 <v4_aaaa>; // not configured
        forward ( first | only );
        forwarders [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
            [ port <integer> ]; ... };
        ixfr-from-differences <ixfrdiff>;
        key <string> {
                algorithm <string>;
                secret <string>;
        };
        key-directory <quoted_string>;
        lame-ttl <integer>;
        maintain-ixfr-base <boolean>; // obsolete
        managed-keys { <string> <string> <integer> <integer> <integer>
            <quoted_string>; ... };
        masterfile-format ( text | raw );
        match-clients { <address_match_element>; ... };
        match-destinations { <address_match_element>; ... };
        match-recursive-only <boolean>;
        max-acache-size <size_no_default>;
        max-cache-size <size_no_default>;
        max-cache-ttl <integer>;
        max-clients-per-query <integer>;
        max-ixfr-log-size <size>; // obsolete
        max-journal-size <size_no_default>;
        max-ncache-ttl <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-udp-size <integer>;
        min-refresh-time <integer>;
        min-retry-time <integer>;
        min-roots <integer>; // not implemented
        minimal-responses <boolean>;
        multi-master <boolean>;
        notify <notifytype>;
        notify-delay <integer>;
        notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
        notify-to-soa <boolean>;
        nsec3-test-zone <boolean>; // test only
        preferred-glue <string>;
        provide-ixfr <boolean>;
        query-source <querysource4>;
        query-source-v6 <querysource6>;
        queryport-pool-ports <integer>; // obsolete
        queryport-pool-updateinterval <integer>; // obsolete
        recursion <boolean>;
        request-ixfr <boolean>;
        request-nsid <boolean>;
        resolver-query-timeout <integer>;
        response-policy {
                zone <string> [ policy ( given | disabled | passthru |
                    no-op | nxdomain | nodata | cname <domain> ) ];
        };
        rfc2308-type1 <boolean>; // not yet implemented
        root-delegation-only [ exclude { <quoted_string>; ... } ];
        rrset-order { [ class <string> ] [ type <string> ] [ name
            <quoted_string> ] <string> <string>; ... };
        server <netprefix> {
                bogus <boolean>;
                edns <boolean>;
                edns-udp-size <integer>;
                keys <server_key>;
                max-udp-size <integer>;
                notify-source ( <ipv4_address> | * ) [ port ( <integer> | *
                    ) ];
                notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer>
                    | * ) ];
                provide-ixfr <boolean>;
                query-source <querysource4>;
                query-source-v6 <querysource6>;
                request-ixfr <boolean>;
                support-ixfr <boolean>; // obsolete
                transfer-format ( many-answers | one-answer );
                transfer-source ( <ipv4_address> | * ) [ port ( <integer> |
                    * ) ];
                transfer-source-v6 ( <ipv6_address> | * ) [ port (
                    <integer> | * ) ];
                transfers <integer>;
        };
        sig-signing-nodes <integer>;
        sig-signing-signatures <integer>;
        sig-signing-type <integer>;
        sig-validity-interval <integer> [ <integer> ];
        sortlist { <address_match_element>; ... };
        suppress-initial-notify <boolean>; // not yet implemented
        topology { <address_match_element>; ... }; // not implemented
        transfer-format ( many-answers | one-answer );
        transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
        trusted-keys { <string> <integer> <integer> <integer>
            <quoted_string>; ... };
        try-tcp-refresh <boolean>;
        update-check-ksk <boolean>;
        use-alt-transfer-source <boolean>;
        use-queryport-pool <boolean>; // obsolete
        zero-no-soa-ttl <boolean>;
        zero-no-soa-ttl-cache <boolean>;
        zone <string> <optional_class> {
                allow-notify { <address_match_element>; ... };
                allow-query { <address_match_element>; ... };
                allow-query-on { <address_match_element>; ... };
                allow-transfer { <address_match_element>; ... };
                allow-update { <address_match_element>; ... };
                allow-update-forwarding { <address_match_element>; ... };
                also-notify [ port <integer> ] { ( <ipv4_address> |
                    <ipv6_address> ) [ port <integer> ]; ... };
                alt-transfer-source ( <ipv4_address> | * ) [ port (
                    <integer> | * ) ];
                alt-transfer-source-v6 ( <ipv6_address> | * ) [ port (
                    <integer> | * ) ];
                auto-dnssec ( allow | maintain | off );
                check-dup-records ( fail | warn | ignore );
                check-integrity <boolean>;
                check-mx ( fail | warn | ignore );
                check-mx-cname ( fail | warn | ignore );
                check-names ( fail | warn | ignore );
                check-sibling <boolean>;
                check-srv-cname ( fail | warn | ignore );
                check-wildcard <boolean>;
                database <string>;
                delegation-only <boolean>;
                dialup <dialuptype>;
                dnssec-dnskey-kskonly <boolean>;
                dnssec-secure-to-insecure <boolean>;
                file <quoted_string>;
                forward ( first | only );
                forwarders [ port <integer> ] { ( <ipv4_address> |
                    <ipv6_address> ) [ port <integer> ]; ... };
                ixfr-base <quoted_string>; // obsolete
                ixfr-from-differences <boolean>;
                ixfr-tmp-file <quoted_string>; // obsolete
                journal <quoted_string>;
                key-directory <quoted_string>;
                maintain-ixfr-base <boolean>; // obsolete
                masterfile-format ( text | raw );
                masters [ port <integer> ] { ( <masters> | <ipv4_address> [
                    port <integer> ] | <ipv6_address> [ port <integer> ] )
                    [ key <string> ]; ... };
                max-ixfr-log-size <size>; // obsolete
                max-journal-size <size_no_default>;
                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 <notifytype>;
                notify-delay <integer>;
                notify-source ( <ipv4_address> | * ) [ port ( <integer> | *
                    ) ];
                notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer>
                    | * ) ];
                notify-to-soa <boolean>;
                nsec3-test-zone <boolean>; // test only
                pubkey <integer> <integer> <integer>
                    <quoted_string>; // obsolete
                server-addresses { ( <ipv4_address> | <ipv6_address> ) [
                    port <integer> ]; ... };
                server-names { <quoted_string>; ... };
                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 | static-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 | external ) [ <string>
                    ] <rrtypelist>; ... };
                use-alt-transfer-source <boolean>;
                zero-no-soa-ttl <boolean>;
                zone-statistics <boolean>;
        };
        zone-statistics <boolean>;
};

zone <string> <optional_class> {
        allow-notify { <address_match_element>; ... };
        allow-query { <address_match_element>; ... };
        allow-query-on { <address_match_element>; ... };
        allow-transfer { <address_match_element>; ... };
        allow-update { <address_match_element>; ... };
        allow-update-forwarding { <address_match_element>; ... };
        also-notify [ port <integer> ] { ( <ipv4_address> | <ipv6_address>
            ) [ port <integer> ]; ... };
        alt-transfer-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        alt-transfer-source-v6 ( <ipv6_address> | * ) [ port ( <integer> |
            * ) ];
        auto-dnssec ( allow | maintain | off );
        check-dup-records ( fail | warn | ignore );
        check-integrity <boolean>;
        check-mx ( fail | warn | ignore );
        check-mx-cname ( fail | warn | ignore );
        check-names ( fail | warn | ignore );
        check-sibling <boolean>;
        check-srv-cname ( fail | warn | ignore );
        check-wildcard <boolean>;
        database <string>;
        delegation-only <boolean>;
        dialup <dialuptype>;
        dnssec-dnskey-kskonly <boolean>;
        dnssec-secure-to-insecure <boolean>;
        file <quoted_string>;
        forward ( first | only );
        forwarders [ port <integer> ] { ( <ipv4_address> | <ipv6_address> )
            [ port <integer> ]; ... };
        ixfr-base <quoted_string>; // obsolete
        ixfr-from-differences <boolean>;
        ixfr-tmp-file <quoted_string>; // obsolete
        journal <quoted_string>;
        key-directory <quoted_string>;
        maintain-ixfr-base <boolean>; // obsolete
        masterfile-format ( text | raw );
        masters [ port <integer> ] { ( <masters> | <ipv4_address> [ port
            <integer> ] | <ipv6_address> [ port <integer> ] ) [ key
            <string> ]; ... };
        max-ixfr-log-size <size>; // obsolete
        max-journal-size <size_no_default>;
        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 <notifytype>;
        notify-delay <integer>;
        notify-source ( <ipv4_address> | * ) [ port ( <integer> | * ) ];
        notify-source-v6 ( <ipv6_address> | * ) [ port ( <integer> | * ) ];
        notify-to-soa <boolean>;
        nsec3-test-zone <boolean>; // test only
        pubkey <integer> <integer> <integer> <quoted_string>; // obsolete
        server-addresses { ( <ipv4_address> | <ipv6_address> ) [ port
            <integer> ]; ... };
        server-names { <quoted_string>; ... };
        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 | static-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 | external ) [ <string> ] <rrtypelist>; ... };
        use-alt-transfer-source <boolean>;
        zero-no-soa-ttl <boolean>;
        zone-statistics <boolean>;
};