The schema provided by IBM is based on the industry work (see previous section) in addition to what is needed to support IBM products that exploit the directory service. The schema is logically divided into several categories for ease of understanding and discussion:
directory server objects such as top and subschema (also, some object classes included in this category are for convenience, although they are not just used by a directory server).
white pages, which includes objects such as person, group, country, organization, organizational unit and role, locality, state, and so on.
security, which includes the objects necessary for authorization, authentication, accounting, and audit.
policy and profile, which include objects ...