The Aggregation relationship indicates that a concept groups a number of other concepts.

Unlike Composition, Aggregation does not imply an existence dependency between the aggregating and aggregated concepts.

Aggregation is always possible between two instances of the same element type.

## Category:

Structural.

## Examples:

A Car Insurance Business Product aggregates a Business Contract and some Business Services.
"Customer File" aggregates an "Insurance Policy" and "Insurance Claim"