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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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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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SEMANTIC
UML keywords
StructuralFeature
AddStructuralFeatureValueAction
StructuralFeatureAction
AddStructuralFeatureValueAction::isReplaceAll
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.
Full quote
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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Related snippets
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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