AggregationType - Aggregation type (internal data type)

An aggregation type is an object type, which inherits from a classification. In order to provide aggregated values when being applied on a collection, the aggregation type defines one or more (aggregation) properties (characteristics). Aggregation types may inherit from typed classifications, only.

Aggregation properties usually contain aggregated data when applying on an individual object collection containing objects of the classifications object type. Aggregation properties define the aggregation rule (derivation rule) as method of the classification's object type.

Each instance of an aggregation type is identified by a category of its classification.