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Package xmlcore.sax currently uses a mix of realtive
and absolute imports. This caused the following bugs:
http://python.org/sf/1513611
http://python.org/sf/1511497
This patch fixes it, by using relative imports.
I tried using absolute imports, but then some of
the tests in the attached test_xml_importing
module fail.
The tests are separate because I don't know how
to include setUp() and tearDown() methods into
non unittest based tests.

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Attaching a new patch and updated tests, since I missed
that make_parser() uses __import__().

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Assigning to Fred Drake, who introduced xmlcore.

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These tests do not trigger any failures for me with the
current trunk, so I'm not sure what the patch is fixing.
I'm attaching a patch that includes tests cases for both of
the issues reportedly fixed by this patch.

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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.