Modelisoft has developed a very cool tool that let's you automatically update the designer model file in the DSL Tools designer project based on changes made to the object model file. It gives the generated shapes in the DD file that derive from their object model correspondents. Valerie posted about this tool on our forum.
If you've used any of the DSL Tools builds, you'll have noticed that it's currently a lot of work to keep these two files in synch. Changes to the object model are relatively easy to make because of the Domain Model Designer, but there's no corresponding tool for the DD file yet. So, the XML in that file must be updated by hand. This tool takes away some of the complexity of doing this.
Thanks to Valerie and Modelisoft for providing this service.