What is the difference between WCF and the RIA Services Domain Service Class? <p>I'm just introducing myself to the basic differences between Silverlight 3 and it's predecessor. Looking at Domain Service Class within RIA services, the execution seems quite a bit simplified. Can someone explain the basic differences between this and Windows Communication Foundation? </p> <p>Does the Domain Service Class employ WCF or some other services framework in the background, or is this new from the ground up?</p>