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- From: John Cowan <cowan@locke.ccil.org>
- To: XML Dev <xml-dev@ic.ac.uk>
- Date: Thu, 22 Oct 1998 15:14:54 -0400
In a private mail I was asked for references on the X.500 schema.
The best short introduction I know is by Paul Barker at UCL:
http://homes.ukoln.ac.uk/~lisap/ccsap/Directory/Docs/prep.html .
RFC 1274 (http://www.isi.edu/in-notes/rfc1274.txt)
gives the whole deal for all the various ISO, Quipu, and
Pilot object classes.
Note that "classes" in X.500 are
more like Java interfaces: they allow multiple inheritance, and
an entry can belong to more than one class. Attributes are
multiple-valued, can be mandatory (not null) or optional
(may be null). "Attribute types" are essentially like Notations;
they specify the classes to which (immutable) values like names,
numbers, etc. belong.
Finally, RFC 2256 (http://www.isi.edu/in-notes/rfc2256.txt) gives
attribute-by-attribute guidance on meaning and usage for ISO
object classes.
--
John Cowan http://www.ccil.org/~cowan cowan@ccil.org
You tollerday donsk? N. You tolkatiff scowegian? Nn.
You spigotty anglease? Nnn. You phonio saxo? Nnnn.
Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5)
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