Re: [Fwd: Re: Questions about IMAP and sequences]

[Ken Hornstein]

>Eww, adding sequences could get complex. Whilst I suppose it might be nice
>for some, do we really need it?

It's actually not that bad.

IMAP has the concept of "message flags", which can be set/read on
a per-message basis.  There's a system one called "\Seen", which
obviously maps to the unseen sequence quite nicely.

You can also manipulate "keywords", which from my reading of the IMAP
specification are simply user-defined flags.  _Depending_ on the IMAP
server implementation and administrative settings, users can create
their own keywords.  Sequences just seem to fall out of that naturally.
I think it's reasonable to only support arbitrary sequences if the
IMAP server supports user-definable keywords.

--Ken