Github user afs commented on the issue:
https://github.com/apache/jena/pull/237
What is the outcome of ordering mixed language tags and also plain
xsd:string?
Changing `NodeValueString` looks dubious - `NodeValueString` is an
xsd:string and can be used in expressions involving strings. `makeNode()` is
lossy so round tripping Node<->NodeValue loses the collation.
A `NodeValueLangString` is much safer (`NodeValue.makeNode` returns
`"foo"@fi`).
I still think there is merit in `ORDER BY arq:collation("fi", ?label)`
approach. Have the app say what collation it wants. I like this because it
means `xsd:string`s can be sorted by locale collation,even differently for
different users.
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