Spring WebFlow: implementation registration pages with several steps

Hi everyone,

Based on Spring Framework (v2.5) I have to implement for a web registration page with several steps.
The user must give his data (contact data, vehicle data, etc.) that are allocated to different pages. A page contains two buttons: a "Back"-button to land on the previous page and a "Next"-button on the next page. With the "Back"-button must the already given data to be kept.
A page has two <form> elements which are connected with two different POJOs or Java classes.
The complete registration process must run off in a session and at the end all entered data for the user after clicking on "Register"button will be stored in the database.
The storage is realized using Hibernate JPA.

My question is: How do I use Spring WebFlow 2.0 two attribute model from a View in a model element in the flow?

Can someone please help me?

Thanks in advance.