A temporary element node constructed by a stylesheet or query may have an incorrect base URI: specifically, it may have the same base URI as another temporary element node that the stylesheet/query created earlier.
See https://sourceforge.net/forum/message.php?msg_id=7537986 for description of the problem.
Patch not yet available. Test case created test.EvaluateNodeTest.
The problem affects 9.1, 9.2, and probably all previous releases.