This is the response object from the DescribeTasks operation.
Inheritance: Amazon.Runtime.AmazonWebServiceResponse
        public override AmazonWebServiceResponse Unmarshall(XmlUnmarshallerContext context)
        {
            DescribeTasksResponse response = new DescribeTasksResponse();

            context.Read();
            int targetDepth = context.CurrentDepth;
            while (context.ReadAtDepth(targetDepth))
            {
                if (context.IsStartElement)
                {                    
                    if(context.TestExpression("DescribeTasksResult", 2))
                    {
                        UnmarshallResult(context, response);                        
                        continue;
                    }
                    
                    if (context.TestExpression("ResponseMetadata", 2))
                    {
                        response.ResponseMetadata = ResponseMetadataUnmarshaller.Instance.Unmarshall(context);
                    }
                }
            }

            return response;
        }
        private static void UnmarshallResult(XmlUnmarshallerContext context, DescribeTasksResponse response)
        {
            
            int originalDepth = context.CurrentDepth;
            int targetDepth = originalDepth + 1;
            
            if (context.IsStartOfDocument) 
               targetDepth += 2;
            
            while (context.ReadAtDepth(originalDepth))
            {
                if (context.IsStartElement || context.IsAttribute)
                {

                    if (context.TestExpression("failures/member", targetDepth))
                    {
                        var unmarshaller = FailureUnmarshaller.Instance;
                        var item = unmarshaller.Unmarshall(context);
                        response.Failures.Add(item);
                        continue;
                    }
                    if (context.TestExpression("tasks/member", targetDepth))
                    {
                        var unmarshaller = TaskUnmarshaller.Instance;
                        var item = unmarshaller.Unmarshall(context);
                        response.Tasks.Add(item);
                        continue;
                    }
                } 
           }

            return;
        }
        /// <summary>
        /// Unmarshaller the response from the service to the response class.
        /// </summary>  
        /// <param name="context"></param>
        /// <returns></returns>
        public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
        {
            DescribeTasksResponse response = new DescribeTasksResponse();

            context.Read();
            int targetDepth = context.CurrentDepth;
            while (context.ReadAtDepth(targetDepth))
            {
                if (context.TestExpression("failures", targetDepth))
                {
                    var unmarshaller = new ListUnmarshaller<Failure, FailureUnmarshaller>(FailureUnmarshaller.Instance);
                    response.Failures = unmarshaller.Unmarshall(context);
                    continue;
                }
                if (context.TestExpression("tasks", targetDepth))
                {
                    var unmarshaller = new ListUnmarshaller<Task, TaskUnmarshaller>(TaskUnmarshaller.Instance);
                    response.Tasks = unmarshaller.Unmarshall(context);
                    continue;
                }
            }

            return response;
        }