I would like to define a message that include a couple of fields and
then a message, which comes from a list of available messages, like.

message Command {
   required int id = 1;
   optional string description = 2;
   one_of {
      c0001,
      c0002,
      c0003
   }
}

message c0001 {
   required string operation = 1;
   required int data = 2;
}

message c0002 {
   required string operation =1;
   required float data = 2;
}

I have resorted to this

message Command {
   required int id = 1;
   optional string description = 2;
   optional C0001 c0001 = 3;
   optional C0002 c0002 = 4;
   optional C0003 c0003 = 5;
}

But there is no easy way to enforce what I want, that is just one of
the possible Cxxxx messages.

Thanks,
Mark.
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