X500

The X.500 protocol is a method for structuring directory databases, typically databases of names of individuals and/or organisations. The X.500 specification is available at [|www.itu.int/itudoc/itu-t/rec/x/x500up/x500.html]

X.500 Information technology - Open Systems Interconnection - The Directory: Overview of concepts, models and services http://www.itu.int/rec/T-REC-X.500/en

X.Imp500 Directory Implementors' Guide http://www.itu.int/rec/T-REC-X.Imp500/en