![]() ![]() Similar to a procedure or function call that abstracts functionality or details not shown at this level. Portion of a diagram being treated as a functional block. Represents the destruction of a header element as a result of a call from another element Represents the destruction of a header element Groups related header elements into subsystems or componentsĪn asynchronous message between header elementsĪ block representing a loop or conditional for a particular header elementĪ call (procedure) message between header elementsĪ "create" message that creates a header element (represented by lifeline going from dashed to solid pattern) Represents an interface or boundary between subsystems,Ĭomponents or units (e.g., air interface, Logical entity in the system (may or may not be implemented by objects) Represents a subsystem, component, unit, or other Represents an object in the system or one of its components Represents an external person or entity that interacts with the system Objects of the system being modeled and are laid out horizontally at the The header portion of the sequence diagram represents the components or Specification and may not be supported by other UML tools. Sequence Diagram Editor tool, some are not part of the UML This tutorial describes the basic drawing elements used in sequenceĭiagrams and when they are used. UML sequence diagramsĪre useful design tools because they provide a dynamic view of the systemīehavior which can be difficult to extract from static diagrams or specifications. To be performed to complete a task or scenario. Used primarily to design, document and validate the architecture, interfacesĪnd logic of the system by describing the sequence of actions that need What is a UML sequence diagram?ĭiagrams are used to represent or model the flow of messages, eventsĪnd actions between the objects or components of a system. Although UML sequenceĭiagrams are used to describe object-oriented software systems, they areĪlso extremely useful as system engineering tools to design systemĪrchitectures, in business process engineering as process flow diagrams,Īs message sequence charts and call flows for telecom/wireless systemĭesign, and for protocol stack design and analysis. Showing the sequence of interactions of the header elements, which areĭisplayed horizontally at the top of the diagram. Time is represented in the vertical direction UML sequence diagrams are used to document the interactions between theĬomponents of a system. ![]()
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