module type OrderedType = sig .. end
Input signature of the functor 
Map.Make.
type 
The type of the map keys.
val compare : t -> t -> int
A total ordering function over the keys.
          This is a two-argument function 
f such that
          
f e1 e2 is zero if the keys 
e1 and 
e2 are equal,
          
f e1 e2 is strictly negative if 
e1 is smaller than 
e2,
          and 
f e1 e2 is strictly positive if 
e1 is greater than 
e2.
          Example: a suitable ordering function is the generic structural
          comparison function 
compare.
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