Explanation of error A cycle of uml:OwnedElement exists

This error is reported when a cycle is found in the values of the property Element:ownedElement.

The error is identified during validation; it prevents Canonical XMI diffing where that test would be applicable. The check for cycles here is equivalent in intent to the constraint Element:not_own_self() but is more robust than the implementation of that found in the UML spec.

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