Object identifiers are not reused. Object identifiers are not based upon the object's location within the database. Describe the size and format and object identifiers. Describe how object identifiers are used to identify a specific object. A.1.1.3 Classes Classes are used to define the database schema.
Classes define the external view of an object.
Class extents are supported. A.1.1.4 Attributes Provides instance attributes. Provides class attributes. Supports basic attribute types. Supports fixed length arrays as attribute types.