They are helpful when managing complex interactions because of the extra context they provide.Ī sequence fragment is a box around a section of the diagram with a label that describes its purpose. Sequence fragments, a new addition to UML 2.0, provide helpful notation to make sequence diagrams more detailed and accurate. Connect notes to objects with a dotted line. Notes are not required and are not an official sequence diagram element, but they can be used to provide additional information as needed. The length of the activation bar depends on the length of activity. Activation barsĪctivation bars are vertical rectangles on a lifeline that make it clear at a glance when each part of the system is active throughout the process. Some systems even have reflexive messages, meaning a lifeline sends a message back to itself, which is shown with an arrow looping back to the original sender. There are a few other, more specific types of messages, such as “create” and “destroy” messages, but the three listed above are the most commonly used in basic sequence diagrams.
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