![]() Lifelines may begin with a labeled rectangle shape or an actor symbol. A dashed line, known as a lifeline, represents events in an SSD. GenMyModel helps you create sequence diagrams with. Within a SSD, this shape models the system as a black box (a system with inner workings that are not immediately visible).Īctors - shown by stick figures, actors are entities that interact with the system, and yet are external to it.Įvents - the system events that the actors generate in the sequence. GenMyModel is an UML editor with powerful features for creating UML sequence diagrams, in the web browser. Objects - this box shape with an underlined title represents a class, or object, in UML. Most elements we cover in use case diagrams remain in use throughout a system sequence diagram, including: ![]() Use case diagrams are simply another diagram type which represents a user's interaction with the system.
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