Figure 24 – Sequence diagram for 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).