Chapter 5 Building Dynamic Diagrams

Sequence diagram objects

You can create the following objects in a sequence diagram:

Object	Tool	Symbol	Description
Actor			An external person, process or something interacting with a system, sub-system or class. See the "Actors" section in the "Building Use Case Diagrams" chapter.
Object			Instance of a class. See the "Objects" section in the "Building Structural Diagrams" chapter.
Activation			Execution of a procedure, including the time it waits for nested procedures to execute. See Activations (OOM).
Interaction Reference			Reference to another sequence diagram. See Interaction References and Interaction Activities (OOM).
Interaction Fragment			Collection of associated messages. See Interaction Fragments (OOM).
Message			Communication that conveys information with the expectation that action will ensue. See Messages (OOM).
Self Message			Recursive message: the sender and the receiver are the same object. See Messages (OOM).
Procedure Call Message			Procedure call message with a default activation. See Messages (OOM).
Self Call Message			Procedure call recursive message with a default activation. See Messages (OOM).
Return Message			Specifies the end of a procedure. Generally associated with a Procedure Call, the Return message may be omitted as it is implicit at the end of an activation. See Messages (OOM).
Self Return Message			Recursive message with a Return control flow type. See Messages (OOM).

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