[rd1979]

Well the format you get from a different extraction tool will be, well different. mediainfo looks different. xml is meant to be easy to manipulate and change to a different xml spec.

I doubt its different at all. I *think* what I am extracting from the MKVs is the 'official' format. If I use mkvmerge to create an MKV, and manually enter in the chapter data, timing and names, this is the xml I will get.
I think this is what the format should be, not some alternate. Actually, the goal should be to support embedded chapters over external ones, and even then, external ones should fit the official spec.
If XML was so easy to manipulate, then I wouldn't have these issues. But there you have it.

I can paste some example xml files if you want.