The semantics are undefined for adding a value that violates the upper multiplicity of the StructuralFeature, and for adding a new value to a StructuralFeature with isReadonly=true after initialization of the object that would have the value.

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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::insertAt
StructuralFeature::isReadonly
MultiplicityElement::/upper
MultiplicityElement::upperValue
The insertion point is ignored if it is used when isReplaceAll=true.
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The semantics are undefined for adding a value that violates the upper multiplicity of the StructuralFeature, and for adding a new value to a StructuralFeature with isReadonly=true after initialization of the object that would have the value.
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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
An insertion point that is a positive integer less than or equal to the current number of values means to insert the new value at that position in the sequence of existing values, with the integer 1 meaning the new value will be first in the sequence.
If a StructuralFeature is marked with isReadOnly true, then it may not be updated once it has been assigned an initial value.
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