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

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

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

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

        if (context.testExpression("Marker", targetDepth)) {
          describeEventsResult.setMarker(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("Events", targetDepth)) {
          describeEventsResult.withEvents(new ArrayList<Event>());
          continue;
        }

        if (context.testExpression("Events/Event", targetDepth)) {
          describeEventsResult.withEvents(EventStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

      } else if (xmlEvent.isEndElement()) {
        if (context.getCurrentDepth() < originalDepth) {
          return describeEventsResult;
        }
      }
    }
  }