Can you have multiple Area4s hanging off a single contiguous Area0?
Each Area4/Area0 ABR will be advertising a different subnet into Area0.
All areas still connect to Area0 so I think it should work; but I am trying to confirm this.
Thanks very much for your help.
This is perfectly acceptable to have a partitioned non-backbone area. OSPF spec only forbids the partioning of the backbone area.
Hope this helps,