Re: [EAI] UTF=x IMAP capabilities

[Alexey Melnikov <[e-mail]>]

On 15/11/2011 13:13, Barry Leiba wrote:
> At today's EAI meeting, I took an action item to start a short
> discussion about the various UTF8=x capabilities in the IMAP doc (
> http://tools.ietf.org/html/draft-ietf-eai-5738bis ).  We've agreed to
> remove UTF8=USER and UTF8=APPEND,
> so I wanted to analyze the remaining
> ones, and look at the implications.
>
> UTF8=ACCEPT says that the server accepts UTF8 strings and allows
> selection of mailboxes in UTF8 mode.  It's the basic "I support the
> EAI UTF8 stuff" capability.  Good.
>
> I presume the intent is that when a client that supports EAI talks to
> a server that supports EAI, it will just use the UTF8 commands
> throughout, yes?
>
> Given that, I see little value in UTF8=ALL.  This says "all mailboxes
> can be UTF8 SELECTed." What value is there to a client in knowing
> that?  I suppose it can eliminate the need to use the UTF8 options in
> the extended LIST command...  and there's no benefit at all if
> extended LIST isn't supported.  I suggest that we also eliminate
> UTF8=ALL.
Works for me.
> That leaves UTF8=ONLY, which is reasonable to leave.  And so we have
> three cases:
>
> 1.  No EAI support (no UTF8=x capabilities listed).
>
> 2.  EAI support, but also support of non-UTF8 versions (UTF8=ACCEPT).
>
> 3.  EAI support, and it's all there is (UTF8=ONLY).
>
> So I suggest that we just spell it out that way, and make UTF8=ACCEPT
> and UTF8=ONLY be mutually exclusive: there can be one, the other, or
> neither, but never both.
>
> Barry