> In the nonsymmetric case, for example:
> 
> <Q1-Nothing>--<Nothing-Q2>,

I think this should work just as in the symmetric case: the returned value 
should be no_requirements because each of the pairs
  Q1 Nothing
  Nothing Q2
returns no_requirements.

The only cases that won't work (and for which I have no solution anyway) are 
cases like
  <Q1 Q2> -- <Q2 Q1>

Do you want to see if you could implement such a scheme, starting in the 
FiniteElementDomination namespace, FE_Nothing/FE_Q and then FESystem classes?

Best
 W.

-------------------------------------------------------------------------
Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/
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