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Enum types as theory parameters?

Is there a way to accomplish something like the following in PVS?

th1  [ t : TYPE = {r,s} ]

  END th1

th2 : THEORY
  tt : TYPE = {p,q}
  importing th1[tt]
END th2

I.e. I would like to declare that t is an enum type with two values, and I would
like to associate p with r and q with s when instantiating th1. The closest I 
have been able to get is to make t, r, and s all be formal parameters of th1, 
but then I lose the mutual exclusion property of r and s, and I have to make
it an explicit assumption of th1.
Pertti Kellom\"aki, Tampere Univ. of Technology, Software Systems Lab