I searched on the Internet for the answer but I was only able to find this post from the old forum/mailing list:
The question in the post went unanswered and I am in a very similar situation now. To re-iterate the questions:
* How to merge the metadata of the private IFD into the root IFD?
* What to populate for the offset parameter in the private IFD pointer tag (the parent tag)?
I am modeling it after the EXIF tag sets, very similar to what is in the above link.
Any help would be greatly appreciated ...