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[Bug 14820] Implementation-defined features checklist

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Date: Mon, 14 Nov 2011 18:18:08 +0000
To: www-xml-schema-comments@w3.org
Message-Id: <E1RQ16e-0007kH-Qr@jessica.w3.org>

--- Comment #2 from Michael Kay <mike@saxonica.com> 2011-11-14 18:18:08 UTC ---
>One of the changes in XML 1.1 was the introduction of Unicode NEL into the S
production, so that whitespace is not in fact the same in XML 1.1

This is a surprisingly common belief even among experts. Perhaps it was true
some draft of XML 1.1. In the actual Rec, NEL is a line ending character but it
is not a whitespace character (production [3]). The set of line ending
characters has changed, but XSD does not reference these. The set of whitespace
characters has not changed.

>The other significant remaining differences between 1.1 and 1.05e are...

I don't believe any of these affect XSD, except perhaps the definition of

It is ·implementation-defined· whether an implementation of this specification
supports the Char production from [XML], or that from [XML 1.0], or both

which could potentially allow an XSD 1.1 processor whose definition of
xs:string allows only XML 1.0 characters to reject a well-formed XML 1.1
document that contains non-1.0 characters in an element or attribute of type
xs:string. (It seems a bit unlikely that an XSD processor would check the
characters in a node whose required type is xs:string, but it's entitled to do

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