[db-wg] Specifying no routes

All, I want to do something like the following: import: from as<number> accept NONE except { from community.contains(val-a) action community.append(val-aa); accept any; from community.contains(val-b) action community.append(val-bb); accept any; } That is to say, on my peering with as<number> I want to accept routes based on communities but add a new community based on the value of the existing one, and then accept the route. Is this a suitable syntax - except for the lack of a NONE keyword? Or can I fake this by using 0.0.0.0 instead of NONE? Or is there a better solution altogether? Thanks for any tips, -- Tim