![]() Messages may be sent to or from an object lifeline in strict sequential order from the top of the lifeline to the bottom.Ī Message from one Object Lifeline to another is indicated by a horizontal line with an arrowhead showing the direction of the message. Our subsequent worked example will utilize the following diagram elements that should be available in most if not all UML tools.Īn Object Lifeline is a vertical line headed by the name and / or classifier type of a business entity or software object. The number and type of diagram elements will vary according to the UML diagramming tool, the version of UML, and the context in which the diagram is to be used. The sequence diagram is arranged in the form of a strict top-to-bottom timeline of interactions – or message exchanges – between business entities or software objects. This diagram therefore helps with the transition from non-object oriented activity diagrams and use case diagrams to the object-oriented paradigm of modern software development. ![]() ![]() In this installment we progress from the UML Use Case Diagram to the UML Sequence Diagram.Ī UML Sequence Diagram is used most commonly to show the realization of a use case in terms of interactions between business entities or software objects. ![]() This series of articles is designed to present the set of core UML diagrams in a way that emphasizes the important relationships between the different diagrams and the logical progression from one diagram to another. ![]()
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