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On Fri, 2003-10-10 at 18:27, Dare Obasanjo wrote:
> All of these problems don't matter as much if all you are designing is a validation language. They mainly become problematic when you want to perform operations on these types either in a programming or query language. 

Really?

How do you constrain a date in the Japanese calendar or a complex number
without having either hardcoded these types in your type system or
defined a system which lets you define new primitive datatypes?

Eric

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