http://www.rfc-editor.org/rfc/rfc1308.txt
RFC 1308: Executive Introduction to Directory Services Using the X.500 Protocol, C. Weider, J. Reynolds1992-03-01T23:00:00-00:00This document is an Executive Introduction to Directory Services using the X.500 protocol. It briefly discusses the deficiencies in currently deployed Internet Directory Services, and then illustrates the solutions provided by X.500. This memo provides information for the Internet community. It does not specify an Internet standard.