RE: [ubl-dev] SBS and Restricted Data Types

[stephen.green@systml.co.uk]

A typical example would be to restrict the length of a string
- such a description which has to be captured downstream in
a way which is limited by string length



Quoting "G. Ken Holman" <gkholman@CraneSoftwrights.com>:

> At 2006-05-03 06:12 -0600, stephen.green@systml.co.uk wrote:
>> One other thing though: How would you reckon the feasibility
>> of logically validating that a subset which includes pattern
>> restrictions of strings is a true strict subset of a schema?
>
> My gut reaction is that is quite challenging to do *for a schema* ... 
> but of course one could create an assertion schema in Schematron to 
> check that.
>
>> Is it a step too far for now? If so I'd propose that adding
>> pattern restrictions might best be kept to specific agreements or
>> individual software implementations rather than including such
>> in a standardisation effort such as the SBS.
>
> What would be examples of pattern restrictions?  Perhaps I'm 
> misunderstanding ... I can't see what you would want to restrict at 
> the level of a string in a formal subset.
>
> . . . . . . . . . Ken
>
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