Sequence Diagram Objects

PowerDesigner supports all the objects necessary to build sequence diagrams.

Object

Tool

Symbol

Description

Actor



An external person, process or something interacting with a system, sub-system or class. See Actors (OOM).

Object



Instance of a class. See Objects (OOM).

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).