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A TransitionUsage is an ActionUsage representing a triggered transition between ActionUsages [CONTESTED] or StateUsages.

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SysML2.0: ERROR: The Specification body, Annex and multiple SysMLv2 PILOT Github samples show or use in code an incorrect transition from an (empty) entry action of a state (breaks the rules for transitions). Prefer transition from start:StateAction!
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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A TransitionUsage is an ActionUsage representing a triggered transition between ActionUsages or StateUsages.
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This statement is NOT consistent with multiple other statements in the specification nor with the metamodel
Compare with:
SysML2.0: 'The source of a transition usage must be a state usage, but its target may be an action usage other than a state usage.'
SysML2.0: 'State usages can be connected by transition usages, which can activate and deactivate the state usages. The triggering of a transition usage from its source state usage to its target state usage deactivates the source state and activates the target state.'
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State usages can be connected by transition usages, which can activate and deactivate the state usages. The triggering of a transition usage from its source state usage to its target state usage deactivates the source state and activates the target state.
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The source of a transition usage must be a state usage, but its target may be an action usage other than a state usage.
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