s-5_2_1.cs

[DataContract]
public class Response
{
  [DataMember]
  public bool Success { get; set; }
}

[DataContract]
public class Request
{
  [DataMember]
  public string CorrelationId { get; set; }
}

[DataContract]
public class DoSomeWorkResponse : Response  { }

[DataContract]
public class DoSomeOtherWorkResponse : Response { }

[DataContract]
public class SomeWorkRequest : Request
{
  [DataMember]
  public int Param1 { get; set; }

  [DataMember]
  public string Param2 { get; set; }
}

[DataContract]
public class SomeOtherWorkRequest : Request
{
  [DataMember]
  public int OtherParam1 { get; set; }       
}

[ServiceContract]
public interface IMyServiceSample
{
  [OperationContract]                                         //soap xml
  [WebGet(ResponseFormat = WebMessageFormat.Json)]            //json
  DoSomeWorkResponse DoSomeWork(SomeWorkRequest request);

  [OperationContract]                                         //soap xml
  [WebGet(ResponseFormat = WebMessageFormat.Json)]            //json
  DoSomeOtherWorkResponse DoSomeOtherWork(SomeOtherWorkRequest request);
}