Github user afs commented on the issue:
https://github.com/apache/commons-rdf/pull/30
RDF 1.1 mentions:
1. Turtle parsing - there is a lang tag rule.
2. The text that conversion to a lowercase lexical is allowed.
3. Value-comparison is case insensitive.
Which is that test for? Lexical or value?
At least acknowledging that RDF's "lowercase" is not in keeping with BCP 47
syntax canonicalization (the registry may change the characters) whatever the
spec makes sense to me and I suspect domain experts; it's following the spec
that "owns" language tags. Focus on the value comparison.
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