Sorry to be late, and off topic but as the initial question of the thread seem to be solved, it's less a problem.
@ Rev .Bob. Very good replies (# 34, 35)! Globaly your answer is very instructive because it allows to distinguish several things that I tend to confuse between what is related to the DTD, and what tradeoff devices must do to be able to deal with different specs (or, their own "limits"). Food for my mind. The distinction betweeen "interpret" in a straight and fuzzy way is also well though out.
I can not help you with the problem you have reported about LO but have you tried Amanuensis (
http://amanuensis.pagesperso-orange.fr/) as it is specifically designed to use odt files?
Or AWP (
http://www.atlantiswordprocessor.com/en/)
Not a solution, I know, just a detour.