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Dare Obasanjo scripsit:
> Those that want validation can be satisfied with a "type system" where
> the simple types are either strings or [named] regular expressions that
> restrict the lexical space of a particular string.
Almost, but not quite. The regexes needed to capture a floating-point
range would be extremely daunting, perhaps not possible. Ranges and
precisions need their own non-regex representation in the system.
> Those that want type
> augmented infosets want them so that they can perform operations on
> values depening on what types they are. They want to add numbers, sort
> dates, concatenate strings, compare equivalence of values, substitute
> and promote types, etc.
I agree, but I despair of getting a proper mechanism (short of a Turing-
complete programming language) for describing, for a novel type, what
its legal operations are.
--
A witness cannot give evidence of his John Cowan
age unless he can remember being born. jcowan@reutershealth.com
--Judge Blagden http://www.ccil.org/~cowan
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