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The semantics are undefined for a value of 0 or an integer greater than the number of existing values

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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
Snippet kind
SEMANTIC
UML keywords
StructuralFeature
AddStructuralFeatureValueAction
StructuralFeatureAction
AddStructuralFeatureValueAction::insertAt
A value of unlimited (“*”) for the insertion point means to insert the new value at the end of the sequence.
Full quote
The semantics are undefined for a value of 0 or an integer greater than the number of existing values
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Reinserting an existing value at a new position in an ordered, unique StructuralFeature moves the value to that position (this works because such StructuralFeature values are ordered sets).
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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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.
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