public ListenerDescription unmarshall(StaxUnmarshallerContext context) throws Exception {
    ListenerDescription listenerDescription = new ListenerDescription();
    int originalDepth = context.getCurrentDepth();
    int targetDepth = originalDepth + 1;

    if (context.isStartOfDocument()) targetDepth += 2;

    while (true) {
      XMLEvent xmlEvent = context.nextEvent();
      if (xmlEvent.isEndDocument()) return listenerDescription;

      if (xmlEvent.isAttribute() || xmlEvent.isStartElement()) {
        if (context.testExpression("Listener", targetDepth)) {
          listenerDescription.setListener(
              ListenerStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }
        if (context.testExpression("PolicyNames/member", targetDepth)) {
          listenerDescription
              .getPolicyNames()
              .add(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }
      } else if (xmlEvent.isEndElement()) {
        if (context.getCurrentDepth() < originalDepth) {
          return listenerDescription;
        }
      }
    }
  }
  public DescribeListenersResult unmarshall(StaxUnmarshallerContext context) throws Exception {
    DescribeListenersResult describeListenersResult = new DescribeListenersResult();
    int originalDepth = context.getCurrentDepth();
    int targetDepth = originalDepth + 1;

    if (context.isStartOfDocument()) targetDepth += 2;

    while (true) {
      XMLEvent xmlEvent = context.nextEvent();
      if (xmlEvent.isEndDocument()) return describeListenersResult;

      if (xmlEvent.isAttribute() || xmlEvent.isStartElement()) {

        if (context.testExpression("Listeners", targetDepth)) {
          describeListenersResult.withListeners(new ArrayList<Listener>());
          continue;
        }

        if (context.testExpression("Listeners/member", targetDepth)) {
          describeListenersResult.withListeners(
              ListenerStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("NextMarker", targetDepth)) {
          describeListenersResult.setNextMarker(
              StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }
      } else if (xmlEvent.isEndElement()) {
        if (context.getCurrentDepth() < originalDepth) {
          return describeListenersResult;
        }
      }
    }
  }