I can't find BYTE Magazine's style guide which has all of these issues pinned down after thousands of man-hours debating them, but I did find two links that are probably even better:
I have a personal/professional interest in the .doc -> XML subject and am pursuing it as a result of your comments. I'll post an update to this message when I have found out more about it. It appears as though there is a Word plugin or enhancement for going between XML and Word documents.
Here is the Microsoft Toolbox for Word/XML
I'll try it out and let you know.