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The main reason driving this evolution is to abstract and decouple the XML model from the user-interface using a simple high level POJO "bean like" access (GET/SET). This design is also motivated by the easy-to-use RPC mechanism built-in GWT which allows exchange of Java objects to and from a server using standard HTTP.
In ideal scenario, the client makes several updates on the model without requesting every time the server. The application should use the server only when persistence of data is needed.
