ACLs as external files

[Fr34k]

Hello All,

I have a question regarding ACL management.

Today, we have an ACL like:
acl "local-blocks" { 192.168/16; 172.16/12; 10/8; } ;

...then in options...

allow-query { "local-blocks"; };
allow-recursion { "local-blocks"; };

Rather than add/remove/modify IP blocks to this ACL, it would be nice to
reference a seperate external file to manange and reference it from named.conf

Does BIND offer this facility for ACLs?
If so, someone mind sharing an example/details?

I would rather distribute ACL files than try to manage entire named.conf files,
if possible.

Thanks -- Chris