How to use complex structure using JavaBean Model

hi,

I am very new to webdynpro. My problem is that i don't know how to use complex structure like java.util.Collection in webDynpro. I have made an EJB and in that i have a business method that returns java.util.Collection.

Can any body help me out of this problem.

Is this something regarding Model Realtion? What it is and how to use it in Webdynpro.