http://www.rfc-editor.org/rfc/rfc2256.txt
RFC 2256: A Summary of the X.500(96) User Schema for use with LDAPv3, M. Wahl1997-12-01T23:00:00-00:00This document provides an overview of the attribute types and object classes defined by the ISO and ITU-T committees in the X.500 documents, in particular those intended for use by directory clients. [STANDARDS-TRACK]