Annex D Client Server Sequences (Informative)
D.1 Example Client Server sequence flow using the RSL concept

The entities represented in the above sequence diagram (Figure 24) are as follows:
Application : The application that provides the relative spatial location information to the OPC UA Server that exposes the elements with this information.
Server : The OPC UA Server exposing the nodes with the relative spatial location information in its address space.
Client : The OPC UA Client that accesses the information exposed by the aforementioned server by using the OPC UA Services provided by the server.
User : The consumer application that uses the OPC UA Client (mentioned above).