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Re: Non-existent syntax 18.104.22.168.4.1.1422.214.171.124.51 referenced (ITS#2029)
Kurt D. Zeilenga wrote:
> Applications should use subschema discovery to check whether
> the server supports the schema elements they intend to use
> and, hence, already knows.
Well, let's assume an application has knowledge about how to deal
with attribute type 126.96.36.199. It wants to know whether
'teletexTerminalIdentifier' is supported by the server. It happily
reads the declaration from attributeTypes in sub schema sub entry.
But the syntax used in the attribute type declaration is not
supported by the server.
The conclusion by the application MUST be:
=> The attribute type is not supported by this server because the
client application has to assume that the server does not even
know how to handle data with syntax 188.8.131.52.4.1.14184.108.40.206.51
(not to speak of matching).
=> All object classes containing the attribute
'teletexTerminalIdentifier' are not supported.
If you are referring to non-existing syntaxes you should leave out
attribute ldapSyntaxes in sub schema sub entry completely. In this
case an application could assume that the server does not make any
statements about which syntaxes it supports and reasonable
defaults could be applied.
> Applications should not use
> schema which they don't have any knowledge of, except for
> some definition provided in a subschema.
Can you elaborate on this? Phrases starting with "except for"
usually opens a big can of worms...
> Subschema doesn't
> provide the application with knowledge of semantics.
I'm not talking about semantics at all.