"Universal Schema Reference":

Directory Server Object Classes
Releases 1.x, 3.x, and 4.0


certificationAuthority
Supported by LDAP
Definition Object class used to store information about Certificate Authorities (CAs) in the directory. Reserved for use by the directory server.
Superior Class top
OID 2.5.6.16


Required Attributes	Description
objectClass	Specifies the objects for this object class.
cACertificate	Certificate, in binary form, from a certification authority.


Allowed Attributes	Description
authorityRevocationList	List, in binary form, of CA certificates that have been revoked and are no longer considered valid or secure.
certificateRevocationList	List, in binary form, of user certificates that have been revoked.
crossCertificatePair	Used when two CAs certify each other so that they can be trusted.