Attributes that are not identifiers and are not associated with a partitioning of the entity type can be moved from one entity type to a subtype within that entity, or vice versa. The identifier is the unique characteristic that distinguishes one occurrence of an entity type from other occurrences.
To move the attribute to a subtype within the entity type, remove it from the identifier of the attribute's parent. Move the attribute and if necessary, add it to the identifier of the subtype.
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