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Packages like org/xml/sax/* or javax/xml/parsers/ are part of required platform (currently JDK1.5+) and there is no reason to bundle another copy into our modules. It just increases download size, makes cloassloading more difficult and affects footprint (mainly on Linux/Solaris with JDK5).
can you check if it's still an issue in 6.5 or provide details where it was in uml before?