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neg: Negative fragment, shows an invalid interaction.region: Critical region fragment, only one thread can execute it at once.loop: Loop fragment, may execute multiple times.par: Parallel fragment, each fragment runs in parallel.opt: Optional fragment, executes only if the supplied condition is true.alt: Alternative multiple fragments, only the one whose condition is true will execute.Notation Description: Sequence fragments, represented as combined fragments, make it easier to create and maintain accurate sequence diagrams. Focus of control, also called execution occurrence, is represented as a tall, thin rectangle on a lifeline. Notation Description: An event is any point in an interaction where something occurs. Notation Description: A note or comment provides the ability to attach various remarks to elements, carrying no semantic force but containing useful information for modelers. Notation Description: A duration message shows the distance between two time instants for a message invocation. Notation Description: A destroy message represents the request for destroying the lifecycle of the target lifeline. Notation Description: A create message represents the instantiation of a target lifeline. The target points to an activation on top of the activation where the message was invoked from. Notation Description: A recursive message represents the invocation of a message on the same lifeline. Notation Description: A self message represents the invocation of a message on the same lifeline. Notation Description: A return message represents the passing of information back to the caller of a corresponding former messag Notation Description: A call message is a type of message that represents the invocation of an operation on the target lifeline. The top and bottom of the rectangle align with the initiation and completion time, respectively. Notation Description: A thin rectangle on a lifeline represents the period during which an element is performing an operation. It essentially portrays the existence of an entity over time during the interaction. Notation Description: A lifeline represents an individual participant in the interaction. Note: Actors do not necessarily represent specific physical entities but rather specific roles of entities. They can be human users, external hardware, or other subjects. Actors interact with the subject by exchanging signals and data.
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Notation Description: An actor represents a type of role played by an entity external to the subject. Here are key elements and concepts within a UML Sequence Diagram: 1. It provides a time-ordered sequence of events, showcasing the flow of messages and the lifeline of each participant. In Unified Modeling Language (UML), a Sequence Diagram is a graphical representation that illustrates the interactions and dynamic behaviors between various components or objects within a system over a specific period. Understanding this notation is pivotal for anyone involved in the design, analysis, or implementation of complex systems, as it provides a standardized visual language that transcends technical boundaries. In this article, we will dissect the Sequence Diagram Notation, unraveling the symbols and conventions employed to depict the intricate dance of entities, messages, and lifelines.
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Within the expansive realm of UML, the Sequence Diagram emerges as a powerful tool for portraying the dynamic interactions between various components within a system. Unified Modeling Language (UML) stands as a universal language for visualizing, specifying, constructing, and documenting the artifacts of software systems.