The problem discussed in http://lists.w3.org/Archives/Public/xmlschema-dev/2010Aug/0016.html affects PyXB and has now been observed in the wild as raised in https://sourceforge.net/projects/pyxb/forums/forum/956708/topic/4850223
Fixed in the 1.2.x series at or before this commit:
Author: Peter A. Bigot <email@example.com>
Date: Thu Nov 1 11:12:43 2012 -0500
trac/112: pyxb greedy algorithm fails on certain cases
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