namespace System.ServiceModel.Description
{
    [ServiceContract(ConfigurationName = "IMetadataExchange", Name = "IMetadataExchange", Namespace = "http://schemas.microsoft.com/2006/04/mex")]
    public interface IMetadataExchange
    {
        [OperationContract(Action = "http://schemas.xmlsoap.org/ws/2004/09/transfer/Get", AsyncPattern = true, ReplyAction = "http://schemas.xmlsoap.org/ws/2004/09/transfer/GetResponse")]
        IAsyncResult BeginGet(Message request, AsyncCallback callback, object state);
    }
}