This page identifies a possible issue, inconsistency, concern, error, or bug!
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This contradicts itself: it says 'insertAt' is 'required', then it says it is not always 'required': Adding a value to an ordered StructuralFeature requires an insertion point for the new value given in the insertAt InputPin, which is required for ordered StructuralFeatures when isReplaceAll is false and omitted for unordered StructuralFeatures..
The 'insertAt' attribute is [0..1].