[protobuf] Struggling with polymorphism

Im struggling to find a way of creating a generic Transaction packet, that can encapsulate many transaction types. I was doing this with oneof but oneof cannot be extended. Enums can't be extended either. Im lost at this point for how to let one or more clients extend Transaction and have thei

[protobuf] Number of issues with protobuf.

I really like using protobuf but I cannot find a way to make this one case work. I need to define a base, lets call it Transaction. Each message could be implemented differently so my original implementation was message Transaction{ oneof type { NTx n = 1; TTx tx = 2; }