packaging jar|pom question

[Jan Torben Heuer <ma...@jtheuer.de>]

I have a product structure like:

myapp (pom)
myapp-core (jar)
myapp-dao (???)
myapp-dao-file (jar)
myapp-dao-sql (jar)

I wanted to pack some Interface in myapp-dao, but I guess I has to be a 'pom' 
rather than a 'jar' to allow subpackages. So, what is the way to go? Do I 
have to create a ...-common package, or pack the Interface in the core?

Jan