Sequence Elements

This example shows some possible elements of Sequence diagrams and their stereotyped display.

Element descriptions

Element	Description	See also
Actor	An instance of an actor at runtime; this can be depicted either as the human figure or in rectangle notation.	Actor
Lifeline	An Object element with the stereotype Lifeline.	Lifeline
Boundary	Represents a user interface screen or input/output device.	Boundary
Entity	A persistent element - typically implemented as a database table or element.	Control
Control	The active component that controls what work gets done, when and how.	Entity