The RFCs that support the LDAP development efforts:
RFC 1558: A String Representation of LDAP Search Filters
RFC 1777: Lightweight Directory Access Protocol
RFC 1778: The String Representation of Standard Attribute Syntaxes
RFC 1779: A String Representation of Distinguished Names
RFC 1781: Using the OSI Directory to Achieve User Friendly Naming
RFC 1798: Connectionless LDAP
RFC 1823: The LDAP Application Programming Interface
RFC 1959: An LDAP URL Format
RFC 1960: A String Representation of LDAP Search Filters
RFC 2251: Lightweight Directory Access Protocol (v3)
RFC 2307: LDAP as a Network Information Service