HL7DeviceExtension hl7Ext = new HL7DeviceExtension();
device.addDeviceExtension(hl7Ext);
List<Connection> devConns = device.listConnections();
Preferences appsNode = deviceNode.node("hl7Application");
for (String appName : appsNode.childrenNames()) {
Preferences appNode = appsNode.node(appName);
HL7Application hl7app = newHL7Application(appNode);
loadFrom(hl7app, appNode);
int n = appNode.getInt("dicomNetworkConnectionReference.#", 0);
for (int i = 0; i < n; i++) {