http://www.rfc-editor.org/rfc/rfc1275.txt
RFC 1275: Replication Requirements to provide an Internet Directory using X.500, S.E. Hardcastle-Kille1991-11-01T23:00:00-00:00This RFC considers certain deficiencies of the 1988 X.500 standard, which need to be addressed before an effective open Internet Directory can be established using these protocols and services [CCI88]. This memo provides information for the Internet community. It does not specify an Internet standard.