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choice – ... If none of the guards evaluates to true, then the model is considered ill formed. To avoid this, it is recommended to define one outgoing Transition with the predefined “else” guard for every choice Pseudostate.

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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
SEMANTIC
TIP
UML keywords
Pseudostate
PseudostateKind::choice
StateMachine
Transition::guard
[else]
ill formed
choice – ... If more than one guard evaluates to true, one of the corresponding Transitions is selected. The algorithm for making this selection is not defined.
Full quote
If none of the guards evaluates to true, then the model is considered ill formed. To avoid this, it is recommended to define one outgoing Transition with the predefined “else” guard for every choice Pseudostate.
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