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   Re: [xml-dev] Question on XSD validator

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Henri Sivonen wrote:
> On May 18, 2005, at 20:19, Michael Kay wrote:
>> By contrast, XML Spy uses its own schema processor, which is not 
>> always 100% conformant with the spec.
> Has anyone systematically surveyed the conformance of various XSD 
> validator implementations? Is there a comparison table somewhere on the 
> Web?

Percentages are irrelevant in this case. Last time I checked, the XML 
Spy parser was explicitly and defiantly non-conformant.

> I have often seen--as in this thread--various qualifications suggesting 
> that a particular implementation is not 100% conformant or is partial, 
> etc. Xerces claims fullness but I've been told it doesn't implement the 
> latest errata.

Xerces tries hard. I know of at least one case where they implemented an 
erratum that was later withdrawn.

The problem is, it is generally conceded that due to the 
complexity/inscrutability of the XML Schema specification that no 
processor could ever claim 100% conformance. In fact, a claim to any 
percentage is suspect, as there is no standard conformance test that 
might be used to verify it.

Bob Foster


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