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initial - ... It is the source for at most one Transition, which may have an associated effect Behavior, but not an associated trigger or guard.

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uml101 - StateMachines - NOTATION REFERENCE CARD
Pseudostates - initial, fork, join, terminate
UML-2.5.1 does NOT permit a trigger or guard on a Transition from an initial pseudostate in a StateMachine but Cameo/MagicDraw does (please avoid).
Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
CONSTRAINT
UML keywords
PseudostateKind::initial
Transition
Transition::effect
Transition::guard
initial - An initial Pseudostate represents a starting point for a Region; that is, it is the point from which execution of its contained behavior commences when the Region is entered via default activation.
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initial - ... It is the source for at most one Transition, which may have an associated effect Behavior, but not an associated trigger or guard.
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There can be at most one initial Vertex in a Region.
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