When the «optional» stereotype is applied to parameters, the lower multiplicity shall be equal to zero. This means the parameter is not required to have a value for the activity or any behavior to begin or end execution ...

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When the «optional» stereotype is applied to parameters, the lower multiplicity shall be equal to zero. This means the parameter is not required to have a value for the activity or any behavior to begin or end execution. Otherwise, the lower multiplicity shall be greater than zero, which is called "required." The absence of this stereotype indicates a constraint, see below.
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