cyclic ML dependencies

Hi all,

I (desperately) need to know if there's a way to avoid the "cyclic ML 
dependencies" error thrown by the compiler (other than the obvious one :-)).

The code I'm developing require this "cyclic dependency":
I have a signature named A and other named B, and I need to provide 
functions on A to convert to B and vice versa, something that looks like 
this:

signature A =
   sig
     type a_type
     val toB : a_type -> B.b_type
   end

signature B =
   sig
     type b_type
     val toA : b_type -> A.a_type
   end

Any help would be extremely appreciated. Thanks, Natalia.


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