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Questions about UML

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Hi all,
I have some questions for illustrating my diagrams.

1. How can I show the interface between my HTTPWrapper (for FFM) and FFM subsystem in the class diagram? Or can I leave it out?

2. How do you draw (in a sequence diagram) the transition to another sequence diagram or to a subsystem? Per reference?

3. How can I show in a sequence diagram that the input don't comes from a client, but from another sequence diagram?

4. Can I access a DAO directly from the SessionFacade or do I need a TransferObject (or ValueObject) by doing so?

TIA for your answers,
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