Re: [xml-dev] XSD simpleType with final = extension

Yesterday, we modified Apache Xerces's XSD 1.0 and 1.1 processor's source code, to allow 'extension' as possible value of simpleType's attribute 'final'.

The Saxon code that accepts "extension" carries the comment

// The inclusion of EXTENSION here assumes the resolution of specification bug 2074

So in fact bug #5783 was a duplicate. The resolution of #2074 was to change XSD 1.0 to allow fixed="extension". But it was never implemented because the WG decided to focus on getting 1.1 finished rather than maintaining 1.0.

Michael Kay

Saxonica

On Sun, Mar 6, 2022 at 9:06 PM Michael Kay <mike@saxonica.com> wrote:
Following the paper trail on this leads to

https://www.w3.org/Bugs/Public/show_bug.cgi?id=5783

which is a bug against XSD 1.0 that was never resolved. So I think the answer to your question is that it's a known bug in the spec.

In most cases, but perhaps not all, when there's a known bug in XSD 1.0, consulting XSD 1.1 will give you the preferred resolution.

Michael Kay
Saxonica

--
Regards,
Mukul Gandhi