The following table describes the elements that you can add to Sequence diagrams. The elements are grouped by Modeling Palette section.
| Element | Icon | Description |
|---|---|---|
| Basic Section | ||
| Lifeline | ![]() |
An individual participant in the Interaction. While Parts and structural features may have multiplicity greater than one, Lifelines represent only one interacting entity.
|
| Actor | ![]() |
A role played by users in your system. |
| Synchronous Message | ![]() |
A message that does not return to its sender until the target process completes. |
| Asynchronous Message | ![]() |
A message that blocks the calling object. This kind of message is capable of creating a new object, creating a new thread, or communicating with an existing thread. |
| Create Message | ![]() |
An element that enables the creation of a lifeline or instance. This is a constructor operation. |
| Message to Self | ![]() |
A message intended for the calling object. |
| Control Section | ||
| Destroy Lifeline | ![]() |
The destruction of an object, located at the bottom of the object's lifeline. Objects can be designed to self-destruct, or you can use messages to trigger the destruction. |
| Combined Fragment | ![]() |
A combined fragment, which lets you specify UML conditions to messages between classes and/or actors. Combined Fragments are a new UML 2.0 convention. For more information, see Working With Sequence Diagram Elements. |
| Comments Section | ||
| Comment | ![]() |
A Notepad notation. Use Comments to record information for an element or link in a diagram. This information is not included in generated code but is for information only. Each Comment can contain unlimited text, and can be numbered. You can also define a stereotype, and enter a noted element. |
| Link Comment | ![]() |
The connection between the comment element and the associated element. |