Sequence Diagram Elements  
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This topic explores the various types of diagram elements that are available in Sequence Diagram Editor.  
Diagram elements are separated into two types:  
·Header Elements - Displayed in the header section of the diagram  
·Body Elements - Displayed in the diagram body  
Header Elements  

Represents an external person or entity that interacts with the system

Represents an object in the system or one of its components

Represents a subsystem, component, unit, or other non-object entity in the system

Represents an interface or boundary between subsystems

Groups related header elements into subsystems or components
Body Elements  

Represents an action taken by a header element
Asynchronous Message

An asynchronous message between header elements

A block representing a loop or conditional for a particular header element
Block End

Marks the end of a block element
Call Message

A call (procedure) message between header elements
Create Message

A "create" message that creates a header element (represented by lifeline going from dashed to solid pattern)
Destroy Element

Represents the destruction of a header element
Destroy Message

Represents the destruction of a header element as a result of a call from another element
Diagram Link

Represents a section or part of a diagram being treated as a functional block. Similar to a procedure or function call that abstracts functionality or details not shown at this level. Can optionally be linked to another diagram for elaboration.
Else Block

Represents an "else" block portion of a diagram block
Flow Note

Documentation note that is automatically formatted to flow after previous elements
Free Note

Documentation note that is free-flowing and can be placed anywhere in the diagram (can also be anchored relative to a flow element)

A simple message between header elements
Page Break

A page break in the diagram
Return Message

A return message between header elements
Scenario Start

Start of a scenario (set of alternatives)
Scenario Case

Start of an alternative or case in a scenario
Scenario End

End of a scenario

A state change for a header element
Steady State

A steady state in the system
Timer Start

Start of a timer for a particular header element
Timer Stop

Stop of a timer for a particular header element
Timer Expiration

Expiration of a timer for a particular header element
See Also  
Application Workspace | Diagram View | Diagram Tasks  

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