I am using middlegen and hibernate to generate hbm.xml files and java
files from an existing database.  My ant script runs middlegen and all
the output files from that process are written to the build dir. 
Consequently  an "ant clean" will remove all that generated code.  I
would like to keep this behaviour as that is what you would expect a
clean to do.  What I want to do is skip the middlgen target if the
database has not changed.  Any suggestions on how to do this?  I have
looked at the ant "uptodate" task but I can't see how to effectively use
that.

I noticed in the example above there is a unless="middlegen.skip" and
thought maybe you have figured out a way to do what I want to do.

Thanks for any input. 

Craig Duncan