public void doServiceUpdating(String udn,String serviceType){
Activator.logger.DEBUG("[Importer] check for service updating");
OSGiDeviceInfo deviceinfo = (OSGiDeviceInfo) devices.get(udn);
UPnPDeviceImpl device = deviceinfo.getOSGiDevice();
boolean isSerPresent = device.existServiceType(serviceType);
if (!isSerPresent) {
/*
* The serivice doesn't exist so it's new.
* Find the udn of owner device and re-register the owner
*/