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Re: Some random noise on rational type systems for XML


Re:  Some random noise on rational type systems for XML
At 04:04 PM 5/11/2003 +1000, Rick Jelliffe wrote:
>If you make your ur-type "string", doesn't that mean that you are throwing
>out the value-space/lexical-space distinction?   How is a integer value
>a subtype of a string?

I see the lexical space issues as properly the domain of XML, while the 
value-space issues belong to consumers of XML - much as XML 1.0 
processors/parsers sort out the lexically-specified parts in a document, 
while the application has responsibility for sorting out what those things 
might mean.

An integer value would not be a subtype of a string.  Instead, it would be 
an interpretation of a given lexical representation in a given context.

(Regular fragmentations[1] was designed along these lines.)

Maybe this is just later binding, but it seems to me to give text-oriented 
folks what they need while letting data-heads do their thing in a 
_separate_ space.  Unfortunately, while W3C XML Schema recognizes this 
distinction, its types still operate on both sides.

[1] - http://simonstl.com/projects/fragment/



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