Hello Alex,

Good reference, indeed you define the same functionality (state-based.)

Since apparently several people (at least including you and me) have
defined similar things it might be worthwhile collecting the functionality
that is most useful and define some datatypes on top of SRFI-60. (At least
I have a preference for defining datatypes and not just bare procedures,
as unlispish as it that preference appears at first sight.)

Dr. Sebastian Egner
Senior Scientist
Philips Research Laboratories
Prof. Holstlaan 4 (postbox WY63, kamer WY 6-55)
5656 AA Eindhoven
The Netherlands
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