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Maintain the state of data for a user's session

Here the analyst uses assertions indicated by the stereotype «!» to override and/or confirm the claims indicated by the source text.

It is not clear that a 'session' is a `user's'; if a server may act as a client, then it may not have a user to input data at all !

It is clear that the 'session' spoken of is a "web session", and it is claimed that the session has data that has 'state'. It's not so clear whether the session has states other than those of its data.

If we had more information we could model this using UML Statechart diagrams for related state machines.