bejubi: I read that article, and same problem here. (SP2007)
However, I found a resource, which might lead to a better understanding of how SP2007 interprets our xml template data, and integrate to the form list.
2/5 and 3/5 would be helpful.
http://blogs.msdn.com/andrew_may/archive/2006/06/29/SharePointBeta2XMLDocumentParsers1.aspx
Thank you ...