[Zope] pythong product container

I am struggling with developing a python product. I can find a few reasonable examples of simple products. But I cant find any examples of products that contain other products. I have previously used ZClasses and by nesting them I can easily create products that are only available within a specific product. I wish to do the same in a python product (at least three levels deep). Can anyone point me to some good documentation, or at least to a good example. Thanks Tom