xsl:sort using @lang locales
I have a question regarding the sort support in Saxon 9.9 and Saxon 10. One of Oxygen XML Editor users is trying to sort German and French terms according to locale sort rules (de-DE, de-AT, fr-FR, fr-CA), but it seems that only responds to main/basic language rules (de-AT = de = de-DE and fr-CA = fr = fr-FR). In the attached input file you can see the desired result for de-AT and fr-CA in the comments.
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