Explanation of error Multiplicity violation
The value of a property violates the multiplicity constraint
of the property. The required multiplicity (i.e. cardinality) is declared in
the UML metamodel. This error report is also produced when a value was
provided as a reference to an xmi:id, but the file did not contain the referent.
There will be an additional error report to this effect if there was no referent
('Referenced object not found').
This error is reported in post-processing
of the Model.
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