This Service is used to add one or more References to one or more Nodes. The NodeClass is an input parameter that is used to validate that the Reference to be added matches the NodeClass of the TargetNode. This parameter is not validated if the Reference refers to a TargetNode in a remote Server.

In certain cases, adding new References to the AddressSpace shall require that the Server add new Server ids to the Server’s ServerArray Variable. For this reason, remote Servers are identified by their URI and not by their ServerArray index. This allows the Server to add the remote Server URIs to its ServerArray.