I am trying to understand why
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The offending character is ꙑ (U+A651, CYRILLIC SMALL LETTER YERU WITH BACK YER, which only looks similar but is not identical with ы) and which belongs to the Cyrillic Extended-B Range.
There is no doubt that in terms of Unicode, the above mentioned character, like any Cyrillic Extended-B range character is a perfectly normal LI character (Lowercase_Letter) character, whose Unicode properties also include ID_Start and ID_Continue. So I am pretty sure this should be a valid xml:id, at least under XML 1.1.
So, I am a bit puzzled as why I get this error in oXygen, even when my XML declaration says 1.1, which should be forward-compatible in terms of Unicode characters in xsd:ID and xsd:Name. Is it a specific oXygen issue, is it Saxon, is it Java?
How can I deal with this — other than mapping all Cyrillic B characters to something else in my xml:ids?