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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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
If the insertAt InputPin is present, it has type UnlimitedNatural and multiplicity 1..1
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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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A value of unlimited (“*”) for the insertion point means to insert the new value at the end of the sequence.
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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.
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.
A value of unlimited (“*”) for the insertion point means to insert the new value at the end of the sequence.
The semantics are undefined for a value of 0 or an integer greater than the number of existing values
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).
The insertion point is ignored if it is used when isReplaceAll=true.
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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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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