The description of the Notified Pull use cases does not provide a clear-enough explanation of the workflow and who does what in it. Specifically, I have not been able to use the diagrams to understand who is subscribing and when the relevant notification is being sent. I believe I understand that the notification contains a query that the subscriber will use later, but the diagram doesn’t refer explicitly to these concepts (subscription, notification, subsequent query). Updating the diagram and explanation to include these terms would hopefully make it easier to understand.