Ok, for you expert XML / FrameMaker users and developers, I have posted a zip file contenting everything you need to round-trip an edd in xml format with FrameMaker 10.
You may ask why. If you know about xslt, then you are starting to get the answer. Once you save your edd to xml you can apply xslt stylesheets to transform your edd globally. I use this most often when I want to add the same specialized elements, attributes and formatting content and level rules to a variety of different edd’s.
You will probably find other uses. Be sure to let me know how you use this new capability.
Here is all you need to get started. http://www.aldousxml.com/Structure.zip