How can I get a view to use multiple zone files?

[John Lange]

I have Bind9 running on my domain which has seperate views for the internal
and external network. So far so good.

The problem is, both the internal and external networks have may records in
common that I'd rather not have to maintain in two seperate zone files.

Is there a way to split the 2 views into 3 zone files? Something like
internal, external, and shared?

Thank you,

John Lange