Dr. Stephan,
Thanks for these suggestions. I have a set of data quality tools fro Evoke
Software. One is a product FTM (Fixed Target Mapping). It allows you to
import DDL and DTD schemas and create data maps via drag and drop.

There is a function that allows you to "synchronize" a new schema with an
existing schema. This worked to show me the differences, but reporting these
ended up being a manual process as I had to create a list in another document
typing the elements that had been dropped as well as the new ones that had
been added.

I have a baseline to work from with this process, so I will try the tools
you suggested and compare.

Thanks again!
Suzanne