)] [KnownType(typeof(busObj0))] [KnownType(typeof(busObj0))] [KnownType(typeof(busObj0))] [KnownType(typeof(busObj0))] public class baseClass { }  [DataContract(Name = "busObj0")] public class busObj0 : baseClass { }  [DataContract(Name = "busObj0")] public class busObj0 : baseClass { }  [DataContract(Name = "busObj0")] public class busObj0 : busObj0 { 