$TTL    604800
@       IN      SOA    ns.example.com. root.example.com. (
                            12         ; Serial
                            604800     ; Refresh
                            86400      ; Retry
                            2419200    ; Expire
                            604800 )   ; Negative Cache TTL
@                        IN      NS      ns.example.com.
@                        IN      NS      ns2.example.com.
@                        IN      MX 10   mail.example.com.
@                        IN      A       192.168.1.109
example.com.             IN      A       192.168.1.109
ns      IN      A       192.168.1.109
ns2     IN      A       192.168.1.109
mail    IN      A       192.168.1.109
www     IN      A       192.168.1.109

$TTL    604800
@       IN      SOA    ns.example.com. root.example.com. (
                            9         ; Serial
                            604800    ; Refresh
                            86400     ; Retry
                            2419200   ; Expire
                            604800 )  ; Negative Cache TTL
@       IN      NS      ns.example.com.
@       IN      NS     ns2.example.com.
109     IN      PTR    example.com.
109     IN      PTR    ns.example.com.
109     IN      PTR    ns2.example.com.

acshellam@dev1:/tmp$ named-checkzone example.com example.com.zone
zone example.com/IN: loaded serial 12
OK

acshellam@dev1:/tmp$ named-checkzone -v
9.6.1-P2

named-checkzone 1.168.192.in-addr.arpa <reverse zone file>

q@y:~/foo$ named-checkzone example.com 1.168.192.in-addr.arpa
zone example.com/IN: NS 'ns.example.com' has no address records (A or AAAA)
zone example.com/IN: NS 'ns2.example.com' has no address records (A or AAAA)
zone example.com/IN: loaded serial 9
OK