active directory - Choosing an RDN for new objectClasses in LDAP? -

What are the best practices for choosing an RDN when creating new object classes in LDAP? I know that you can choose from UID, CN, OUU, and so on, but what practices should follow?

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The same principle applies to RDN essentially (part of) your primary key:

• There is something unique about entry (or combination of things).
• Not something that does not change (or not changed much).