Here you can see a sample of source code generated by Middlegen and XDoclet. It's the code generated for the sample database you can see in the demo or on the front page.
All XDoclet-generated files are based on files (with various XDoclet @tags) generated by Middlegen.
To figure out what's generated by Middlegen and what's generated by XDoclet, look for the @author tag in the Java file. If it says
@author <a href="http://boss.bekk.no/boss/middlegen/">Middlegen</a>
-it's generated by Middlegen. If not, it's generated by XDoclet.
All XML files are generated by XDoclet.