1: using System.ServiceModel;
   2: namespace Artech.ServiceInvocationViaMetadata.Contracts
   3: {
   4:     [ServiceContract(Namespace = "http://www.artech.com/")]
   5:     public interface ICalculator
   6:     {
   7:         [OperationContract]
   8:         double Add(double x, double y);
   9:     }
  10: }