Consequently, choice is used to realize a dynamic conditional branch. It allows splitting of compound transitions into multiple alternative paths such that the decision on which path to take may depend on the results of Behavior executions performed ...

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uml101 - StateMachines - NOTATION REFERENCE CARD
Pseudostates - choice
Source
Unified Modeling Language 2.5.1
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
SEMANTIC
UML keywords
Pseudostate
PseudostateKind::choice
StateMachine
dynamic conditional branch
Behavior
compound transition
choice – This type of Pseudostate is similar to a junction Pseudostate ... and serves similar purposes, with the difference that the guard Constraints on all outgoing Transitions are evaluated dynamically ...
Full quote
Consequently, choice is used to realize a dynamic conditional branch. It allows splitting of compound transitions into multiple alternative paths such that the decision on which path to take may depend on the results of Behavior executions performed in the same compound transition prior to reaching the choice point.
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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.
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