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If isReplaceAll is true ... The StructuralFeature always has a single value when the Action completes, even if the lower multiplicity of the StructuralFeature is greater than 1.

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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
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RULE
UML keywords
StructuralFeature
AddStructuralFeatureValueAction
StructuralFeatureAction
AddStructuralFeatureValueAction::isReplaceAll
Action
If isReplaceAll is true, then the existing values of the StructuralFeature are removed before the new value is added, except if the StructuralFeature already contains the new value, in which case it is not removed under this option.
Full quote
If isReplaceAll is true ... The StructuralFeature always has a single value when the Action completes, even if the lower multiplicity of the StructuralFeature is greater than 1.
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If isReplaceAll is false and the StructuralFeature is unordered and unique, then adding a value that is already contained in the StructuralFeature has no effect.
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16.8.3.3 Add Structural Feature Value Actions: An AddStructuralFeatureValueAction is a StructuralFeatureAction for adding a value to a StructuralFeature of an object.
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If the insertAt InputPin is present, it has type UnlimitedNatural and multiplicity 1..1
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