http://www.rfc-editor.org/rfc/rfc4511.txt
RFC 4511: Lightweight Directory Access Protocol (LDAP): The Protocol, J. Sermersheim2006-06-01T23:00:00-00:00This document describes the protocol elements, along with their semantics and encodings, of the Lightweight Directory Access Protocol (LDAP). LDAP provides access to distributed directory services that act in accordance with X.500 data and service models. These protocol elements are based on those described in the X.500 Directory Access Protocol (DAP). [STANDARDS-TRACK]