-1. check that the subscription request is correct.
-1. establish the computation chain of the required data (if not already done).
-1. create a named event for the computed data (if not already done).
-1. ask the framework to establish the subscription to the event for the request.
-1. optionally give indications about the event in the reply to the client.
+1. Check that the subscription request is correct.
+1. Establish the computation chain of the required data (if not already done).
+1. Create a named event for the computed data (if not already done).
+1. Ask the framework to establish the subscription to the event for the request.
+1. Optionally give indications about the event in the reply to the client.