>likewise, the loopback address for ip16 falls under
>2.4 Address Type Representation
>   The specific type of an IPv6 address is indicated by the leading bits
>   in the address.  The variable-length field comprising these leading
>   bits is called the Format Prefix (FP).  The initial allocation of
>   these prefixes is as follows:
>    Allocation                            Prefix         Fraction of
>                                          (binary)       Address Space
>    -----------------------------------   --------       -------------
>    Reserved                              0000 0000      1/256
>    ...
>so i'd be tempted to do
>    zone "0.0.ip6.int" { type master; file "0.0.ip6.int"; };

	Please note that not everyting under ::/8 is for looopback.  There
	are other usage (:: is for unspecified, ::ffff:10.1.1.1 is for
	v4 mapped, ::10.1.1.1 is for v4 compatible).  Do you still prefer
	::/8 (= 0.0.ip6.int.) to be declared in zone file?

itojun