Github user kinow commented on the issue: https://github.com/apache/jena/pull/237 @ajs6f, The first param, you mean the collation? If we get two NodeValueSortKey with different collation language tags, it will sort the text as normal strings (i.e. ignoring locale specific collation orders, using JVM default behaviour of String.compareTo I think). Not sure if we could take another action here... >we mark it as unsupported? I think so, and add to the function documentation (probably somewhere [here](https://jena.apache.org/documentation/query/library-function.html) ?) about the implementation details, risks, considerations, and so on.
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