Simple Field question

[Edward Stanford <stanford@xxxxxxx>]

Thanks to all who responded to my last.

This one is fairly simple: assume one has an instance of a FieldImpl.  How 
may one dynamically determine the FunctionType, and hence, the range 
RealType, of the FieldImpl?  This seems like it should be _really_ obvious, 
and closely analogous to the many methods that enable one to investigate 
the domain Set, but I haven't spotted it.

Edward