Re: [xml] Euro sign in xml:id

[Nick Wellnhofer <wellnhofer aevum de>]

On 06/04/2022 00:40, Einhard Leichtfuß wrote:
> I noticed that xmllint complains about the Euro sign ("€") in an xml:id.
>   - "validity error : xml:id : attribute value € is not an NCName"
>
> The W3C's XML specification, however, seems to allow this:
>   - https://www.w3.org/TR/xml-id/#processing
>   - https://www.w3.org/TR/xmlschema-2/#ID
>   - https://www.w3.org/TR/xml-names/#NT-NCName
>   - https://www.w3.org/TR/xml/#NT-NameStartChar
>   * '€' is #x20ac which is in the range [#x2070-#x218F], a subset of
>     NameStartChar, and may, therefore, occur anywhere in an NCName.
>
> Am I mistaken above, should I look at another specification, or is this
> a bug?

This is a bug. The xmlValidate*Name functions in tree.c weren't updated to XML 
1.0, Fifth Edition which includes the following change:

    https://www.w3.org/XML/xml-V10-4e-errata#E09

This issue is now tracked here:

    https://gitlab.gnome.org/GNOME/libxml2/-/issues/364

Nick