Hi, i just started using the node-opcua and wanted to ask whether there is any chance to subscribe for a change in an objects References (child items aka new Variables). Background: i am already providing a method for clients that enables them to add Variables in the server's addressspace. The scenario i am aiming at is that clients connect time after time. I want the already connected clients to be notified if (this method was called by a new client) there are new variables (not changed ones) under a certain path. Does anyone have any idea?