Github user ansell commented on the issue:
https://github.com/apache/commons-rdf/pull/30
In the RDF4J/Sesame case, we have had some users request, and some other
users complain about , both lowercasing, which was used in the past, and
canonicalisation, so RDF4J will default to leaving case alone, but any user is
free to switch on the canonicalisation. Currently there isn't a
lowercase-all-tags option, but that may also appear in the future.
For reference, the language tag canonicalisation procedure that RDF4J
optionally uses, which relies on the JDK's copy of the IANA Language Subtag
Registry, is:
```
new Locale.Builder().setLanguageTag(tag).build().toLanguageTag()
```
There are other possible methods, but the method above is the only one that
I could find which throws an error if the original tag is illformed.
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