![]() An option is semantically equivalent to an alternativeĬombinedFragment where there is one operand with non-empty content and the second operand is empty. UML Sequence Diagram Examples Online Free to Download Free Sequence Diagram Examples and Step by Step Tutorials Last updated on Februby Norlyn Opinaldo Sequence diagram is one of the best ways to identify the requirements and processes of a system. The InteractionOperatorKind opt designates that the CombinedFragment represents a choice of behavior whereĮither the (sole) operand happens or nothing happens. An example of sequence diagram for Online. An implicit true guard is implied if the operand Online customer can search book catalog, view description of a selected book, add book to shopping cart, do checkout. ![]() The chosen operand must have an explicit or implicit guardĮxpression that evaluates to true at this point in the interaction. The InteractionOperatorKind alt designates that the CombinedFragment represents a choice of behavior. 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. alt may be used to describe two variants of payment: using credit card or wire money transfer. In the case of online shopping, it helps show how the customer navigates from choosing products to completing their purchase. 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 UML Sequence Diagram is a visual representation of the ordering and processing of events to achieve a particular goal. ![]() ![]() Only one of the options will be executed. A UML Sequence Diagram is a visual representation of the ordering and processing of events to achieve a particular goal. Alt is used to describe alternative scenarios of a workflow. ![]()
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