Action
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Represents an action taken by a header element
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Asynchronous Message
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An asynchronous message between header elements
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Block
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A block representing a loop or conditional for a particular header element
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Block End
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Marks the end of a block element
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Call Message
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A call (procedure) message between header elements
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Create Message
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A "create" message that creates a header element (represented by lifeline going from dashed to solid pattern)
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Destroy Element
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Represents the destruction of a header element
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Destroy Message
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Represents the destruction of a header element as a result of a call from another element
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Diagram Link
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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.
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Else Block
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Represents an "else" block portion of a diagram block
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Flow Note
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Documentation note that is automatically formatted to flow after previous elements
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Free Note
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Documentation note that is free-flowing and can be placed anywhere in the diagram (can also be anchored relative to a flow element)
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Message
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A simple message between header elements
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Page Break
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A page break in the diagram
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Return Message
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A return message between header elements
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Scenario Start
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Start of a scenario (set of alternatives)
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Scenario Case
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Start of an alternative or case in a scenario
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Scenario End
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End of a scenario
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State
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A state change for a header element
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Steady State
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A steady state in the system
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Timer Start
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Start of a timer for a particular header element
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Timer Stop
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Stop of a timer for a particular header element
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Timer Expiration
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Expiration of a timer for a particular header element
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