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Each entry has a unique name relative to its parent called its 'relative distinguished name' or RDN.

Relative distinguished name (RDN) MUST be unique among all its siblings.

Example

The world { relative name 'dc=com' , description = 'The world' }
    |
    |
    ---- A company { relative name = 'o=gerard nico', web address = 'www.gerardnico.com'  }
            |
            |
            ----- A person { relative name = 'cn=Nico', favorite drink = 'martini' }
            |
            ----- A person { relative name = 'cn=Trudi', favorite drink = 'beer' }
            |
            ----- A person { relative name = 'cn=Jay', favorite drink = 'mineral water' }

The RDN of Nico would be: 

cn=Nico

CN = RDN ??? as the CN attribute MUST be used to form the RDN of the subschema entry. See in the standard 3.2.2. Subschema Entries and Subentries