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PARTITIONING/CLASSIFIER

For each partitioning of an entity type or subtype, there is a partitioning object. Within the partitioning object is a foreign key of the parent entity type or subtype.

Each partitioning object is the parent of the entity subtypes. Therefore, within each subtype is a foreign key of the partitioning to which it belongs. The classifier contains foreign keys of both the partitioning and the attribute that serves as the classifier.