ServiceNode focus=sg.getServiceNode(focusServiceType);
tsn = sg.getServiceNode(id.getServiceType());
ServiceNode sn=ret.getServiceNode(sd.getServiceType());
ServiceNode focus=sg.getServiceNode(focusServiceType);
tsn = sg.getServiceNode(id.getServiceType());
ServiceNode sn=ret.getServiceNode(sd.getServiceType());