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   Re: [xml-dev] UPA and schema handling

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Bob Foster wrote:
> Unique particle attribution is normative and not optional, but not all 
> processors check it correctly and some processors check it optionally. 
> Of course that leads to interoperability errors, and not just around 
> UPA, but that's the state of the art.

Whilst UPA assists a particular style of implementation, it kills a lot 
of the expressiveness of W3C schema. It certainly prevents being able to 
evolve a given schema.

It's also obvious that a processor using schema to build a code model is 
  able to ignore UPA and still get its work done.

So I wonder if there isn't a case for a standard schema 1.0 extension: a 
flag to indicate 'this schema is valid except it violates UPA 
restrictions'. It wouldn't be backwards compatible with a strictly 
compliant 1.0 schema validator, but could be useful in a specific 
processing domain such as Web services.



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