Alternative In Sequence Diagram. The insertion of those alternate flows in a system sequence diagram may be done in stages Initially the exceptions may be indicated in the diagram as well as where they occur Then opt fragments can be produced that is optional parts as shown in Figure 536.
In the previous figure a loop and alternative (alt) interaction operator define the two combined fragments Interaction operands In sequence diagrams an interaction operand is a container that groups the interaction fragments and messages that run if the guard condition is met If there is no guard condition the block always runs.
Create a UML sequence diagram support.microsoft.com
Using Alternative Combined Fragments in Sequence Diagram Create a sequence diagram as follows Sequence diagram Select Alt Combined Fragment in the diagram toolbar Press on the blank area of the diagram and drag to cover the Draw a message from ATM Machine lifeline to Person lifeline in the.
Combined fragments in sequence diagrams
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Difference between alt and opt fragment in sequence …
Besides just showing message calls on the sequence diagram the Figure 4 diagram includes return messages These return messages are optional a return message is drawn as a dotted line with an open arrowhead back to the originating lifeline and above this dotted line you place the return value from the operation.
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In the sequence diagram you can use a combined fragment with an alt operator This allows you to show alternative behaviors Graphically the alternatives are in tiled regions separated by dashed horizotal lines You can document the precise condition for each alternative in a guard (ie [condition] ) Example.