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DB Designer had a lot of bugs but one outstanding feature was that database models were saved in plain XML by default.
This allowed a user to diff file versions via SVN or Beyond Compare, easily finding any changes made to the database.
Unfortunately, DB Designer’s succsssor, MySQL Workbench, stores files in a proprietary MVW file format, which is unreadable.
Is it possible to force MySQL Workbench to save as XML?
No, the current version (5.2.10 beta) does not support that.
However, the file format is not proprietary – its a simple zip archive. It contains a single XML document which is the complete database model. I wrote this SO question a couple of months ago with the same goal as you seem to have. I wanted to be able to do
svn diff model.mwbThe answer I got there helped me write a small script which unzipped the file before passing it to the diff tool. It worked decently and if you’re interested I can post it somewhere.
I also very recently started a thread on the Workbench forum about this issue. Hopefully someone on the development team can provide some more input on this.
EDIT: it is now being tracked by MySQL Bug #51203 with a target of 6.0.