Jax-ws @XmlRootElement does not generate root element name

I created a sample jax-ws project in my eclipse.

below is the code that has an interface, an Imp class and an assistant class

Interface:

@WebService

public interface HelloWorld
{

    @WebMethod(operationName="getString") 
    @WebResult(name="Result")
    Helper getHelloWorldAsString(@WebParam(name="input")String str); 
}

Implementation:

@WebService(endpointInterface = "com.test.HelloWorld")
public class HelloWorldImpl implements HelloWorld
{

    @Override
    public Helper getHelloWorldAsString(String str) {

        Helper h = new Helper();
        String[] str1 = {"ABC", "DEF", "GHI"};
        h.setTempValue(str1);


        return h;
    }
}

Assistant:

@XmlRootElement(name = "TypeCode")
@XmlType(name = "TypeCode")
@XmlAccessorType(XmlAccessType.FIELD)

    public class Helper 
    {
        @XmlElement(name="value")
        private String[] tempValue;

        public String[] getTempValue() {
            return tempValue;
        }

        public void setTempValue(String[] tempValue) {
            this.tempValue = tempValue;
        }   
    }

When I deploy the code above and submit the request, I see the answer as shown below:

<ns2:getStringResponse xmlns:ns2="http://test.com/">
         <Result>
            <value>ABC</value>
            <value>DEF</value>
            <value>GHI</value>
         </Result>
      </ns2:getStringResponse>

The above answer has a root element as "Result", but I declared @XmlRootElement(name = "TypeCode")in the Helper class. My question is why there is no “TypeCode” marking as the root element, and not “Result”. Yak-ws ignores @XmlRootElementand comes with @WebResult?