Please, any time the script does not work for your use-case and you want
to fix it and voluntarily provide a patch to be integrated, follow these
guidelines:

1/ some kind of minimal test case should be added to the test suite

2/ no test from the original test suite should be broken after
   applying the patch unless there is a pretty good reason to change
   something and then, new expected results have to be provided

3/ try to comply with style (and use checkers like pep8, pyflakes)


Refactoring effort is welcome as well (please respect 2/ and 3/).


Notable pointers:
- http://www.thaiopensource.com/relaxng/implement.html