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The Relationships metamodel contains the following enumerated type:
• AggregationKind An enumeration that denotes what kind of aggregation an Association defines.
When placed on a target end, specifies the relationship of the target end to the source end. AggregationKind defines an enumeration
whose values are:
• ak_none -The end is not an aggregate.
• ak_aggregate -The end is an aggregate; therefore, the other end is a part and must have the aggregation value of none. The part may be contained in other aggregates.
• ak_composite -The end is a composite; therefore, the other end is a part and must have the aggregation value of none. The part is strongly owned by the composite and may not be part of any other composite.
The default value is ak_none.