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

    if (context.isStartOfDocument()) targetDepth += 1;

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

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

        if (context.testExpression("instanceId", targetDepth)) {
          instance.setInstanceId(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("imageId", targetDepth)) {
          instance.setImageId(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("instanceState", targetDepth)) {
          instance.setState(InstanceStateStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("privateDnsName", targetDepth)) {
          instance.setPrivateDnsName(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("dnsName", targetDepth)) {
          instance.setPublicDnsName(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("reason", targetDepth)) {
          instance.setStateTransitionReason(
              StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("keyName", targetDepth)) {
          instance.setKeyName(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("amiLaunchIndex", targetDepth)) {
          instance.setAmiLaunchIndex(IntegerStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("productCodes/item", targetDepth)) {
          instance.withProductCodes(ProductCodeStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("instanceType", targetDepth)) {
          instance.setInstanceType(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("launchTime", targetDepth)) {
          instance.setLaunchTime(DateStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("placement", targetDepth)) {
          instance.setPlacement(PlacementStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("kernelId", targetDepth)) {
          instance.setKernelId(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("ramdiskId", targetDepth)) {
          instance.setRamdiskId(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("platform", targetDepth)) {
          instance.setPlatform(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("monitoring", targetDepth)) {
          instance.setMonitoring(MonitoringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("subnetId", targetDepth)) {
          instance.setSubnetId(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("vpcId", targetDepth)) {
          instance.setVpcId(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("privateIpAddress", targetDepth)) {
          instance.setPrivateIpAddress(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("ipAddress", targetDepth)) {
          instance.setPublicIpAddress(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("stateReason", targetDepth)) {
          instance.setStateReason(StateReasonStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("architecture", targetDepth)) {
          instance.setArchitecture(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("rootDeviceType", targetDepth)) {
          instance.setRootDeviceType(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("rootDeviceName", targetDepth)) {
          instance.setRootDeviceName(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("blockDeviceMapping/item", targetDepth)) {
          instance.withBlockDeviceMappings(
              InstanceBlockDeviceMappingStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("virtualizationType", targetDepth)) {
          instance.setVirtualizationType(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("instanceLifecycle", targetDepth)) {
          instance.setInstanceLifecycle(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("spotInstanceRequestId", targetDepth)) {
          instance.setSpotInstanceRequestId(
              StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("clientToken", targetDepth)) {
          instance.setClientToken(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("tagSet/item", targetDepth)) {
          instance.withTags(TagStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("groupSet/item", targetDepth)) {
          instance.withSecurityGroups(
              GroupIdentifierStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("sourceDestCheck", targetDepth)) {
          instance.setSourceDestCheck(BooleanStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("hypervisor", targetDepth)) {
          instance.setHypervisor(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("networkInterfaceSet/item", targetDepth)) {
          instance.withNetworkInterfaces(
              InstanceNetworkInterfaceStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("iamInstanceProfile", targetDepth)) {
          instance.setIamInstanceProfile(
              IamInstanceProfileStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("ebsOptimized", targetDepth)) {
          instance.setEbsOptimized(BooleanStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }

        if (context.testExpression("sriovNetSupport", targetDepth)) {
          instance.setSriovNetSupport(StringStaxUnmarshaller.getInstance().unmarshall(context));
          continue;
        }
      } else if (xmlEvent.isEndElement()) {
        if (context.getCurrentDepth() < originalDepth) {
          return instance;
        }
      }
    }
  }