[JDEV] case-sensitive of JID

David Waite mass at akuma.org
Wed Feb 13 15:53:58 CST 2002

Alexandre N. Safiullin wrote:

>Hash: SHA1
>>>>>>"a" == admin  <admin at jabber.fsinf.de> writes:
> a> On Tue, 12 Feb 2002, Matthias Wimmer wrote:
> >>> I believe that JIDs are not case sensitive, but case should be retained
> >>> for display.
> >> The user and domain part is not case sensitive - the resource part is.
> a> Note that some transports are buggy. At least AIM-t and ICQv7-t both are
> a> case sensitive concerning JIDs. 
> Yeah.. In order to properly fix it plz tell me whether user (and server ;) )
> parts of JID can be non-ASCII (i.e. UTF8)?
Tough question :-)
Case insensitivity is only done in most implementations based on 
US7ASCII characters, i.e À != à.

I do not think DNS allows for non-US7ASCII characters at all currently 
(at least if you go by RFCs), but the host portion is meant to have the 
exact same restrictions as DNS names. I believe that some 
implementations will allow you to declare local components named with 
extended characters, in this case those same implementations would most 
probably default to case-sensitive comparisons of those characters. 
Completely undefined behavior :-)

-David Waite

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