Description
assume the following mappings exist in the global NamespaceRegistry:
pre1 <-> uri1
pre2 <-> uri2
the following stmt correclty throws a NamespaceException, complaining that an existing prefix can not be remapped:
nsReg.registerNamespace("pre2", "uri1")
but, as a sideeffect, it has also removed the mapping pre1 <-> uri1.