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3.1.1.3.1.3.5 Searches Using the objectCategory Attribute

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When an LDAP search filter F contains a clause C of the form "(objectCategory=V)", if V is not a DN but there exists an object O such that O!objectClass = classSchema and O!lDAPDisplayName = V, then the server treats the search filter as if clause C was replaced in F with the clause "(objectCategory=V')", where V' is O!defaultObjectCategory.

For example, if the LDAP search filter contains clause "(objectCategory=contact)", because the defaultObjectCategory of class contact is CN=person,CN=schema,CN=configuration,DC=Fabrikam,DC=com, Active Directory will treat the clause as "(objectCategory=CN=person,CN=schema,CN=configuration,DC=Fabrikam,DC=com)".