You can associate a Partitioning with a classifying Attribute. A classifying attribute is one whose value determines which Entity Subtype an entity belongs to.
If a partitioning is fully enumerated, every entity belonging to the entity type it divides must belong to one of the subtypes in the partitioning. Every value of the classifying Attribute identifies an Entity Subtype, and every parent Entity Type occurrence is an occurrence of an Entity Subtype.
For example, Job Type could be fully enumerated because company employees are either managers or staff. Job Status could be not fully enumerated because Job Status could also be LEAVE OF ABSENCE.
Life Cycle Partitioning specifies the states an entity can pass through from creation to archiving or deletion. For example, in time NEW EMPLOYEE becomes RETIRED EMPLOYEE or FORMER EMPLOYEE.
An Entity Type can have only one life cycle Partitioning, which must be fully enumerated. Life Cycle Partitioning is used in Life Cycle Analysis.
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