<assignment-specification> is optional and may be omitted even if the Operation has Parameters. No standard mapping is defined from an assignment specification to the UML abstract syntax. A conforming tool is not required to support this notation. ...

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Figure 14.7 Composite State with two States
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
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NOTATION
UML keywords
CallEvent
Trigger
Operation
<assigned-name> is an implicit assignment of the argument value for the corresponding Parameter of the Operation to a Property or Variable of the context object for the triggered Behavior.
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<assignment-specification> is optional and may be omitted even if the Operation has Parameters. No standard mapping is defined from an assignment specification to the UML abstract syntax. A conforming tool is not required to support this notation. If it does, it may provide a mapping to standard UML abstract syntax, e.g., by implicitly inserting Actions to carry out the behavior implied by the notation.
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A CallEvent is denoted by the name of the triggering Operation, optionally followed by an assignment specification: <call-event> ::= <name> [‘(‘ [<assignment-specification>] ‘)’] <assignment-specification> ::= <assigned-name> [‘,’ <assigned-name>]*
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