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The patch is extremely fragile and works only if you don't
mix objects from xml and xmlcore. As your test shows, it
breaks if you import 'make_parser' and 'SAXParseException'
from different packages.

As for the tests, the first four fail for me if I run them
as a script. They are not integrated into the test suite
since they are missing a test_main() function.

It seems that renaming xmlcore back to xml is the simplest
solution, so I'll just close this patch.