The InteractionOperatorKind opt designates that the CombinedFragment represents a choice of behavior whereĮither the (sole) operand happens or nothing happens. An implicit true guard is implied if the operand Well, a sequence diagram shows the sequence of public method invocations (the horizontal arrows) between defined objects (the vertical lines) necessary to. The chosen operand must have an explicit or implicit guardĮxpression that evaluates to true at this point in the interaction.
Define one or more interface classes for each actor. The InteractionOperatorKind alt designates that the CombinedFragment represents a choice of behavior. Include the actor from the use case diagram in the enhanced sequence diagram. opt and alt are two different operator types and here's how the specification describes them: In the UML specification the meaning is described in section 17.12.15. Create sequence diagrams online using Createlys online tool. alt may be used to describe two variants of payment: using credit card or wire money transfer. Opt is used to describe an optional step in the workflow.įor example, for an online shop purchase sequence diagram you may use opt to describe how the user can add gift wrapping if she wishes. A sequence diagram is a type of interaction diagram because it describes howand in what ordera group of objects works together. A sequence diagram, also known as a sequence diagram, sequential diagram or sequential diagram, is a UML interaction diagram. Only one of the options will be executed. A sequence diagram describes a pattern of interaction among objects, arranged in a chronological order it shows the objects participating in the interaction by their 'lifelines' and the messages that they send to each other. Alt is used to describe alternative scenarios of a workflow.
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