Thomas Schwinge <schwinge-lists-gnus.org-ding <at> nic-nac-project.de> wrote:
> although I was not able to enter the ones whose are containing a
> '\': The were refused with:
> #v+
> Retrieving newsgroup: nnmaildir+nic-nac-project:lists.gnus.org.ding...
> gnus-select-newsgroup: Couldn't activate group nnmaildir+nic-nac-project:lists.gnus.org.ding:
No such group: lists.gnus.org.ding
> #v-

I'm not sure what's happening here.  It works for me, with a CVS
checkout from 2004-01-25.  What version of Gnus are you using?

You could work around it by making a new directory for nnmaildir to
look at, which would contain symlinks to the actual maildirs.  The
symlink names could omit "\".

> The issue remaining to be resolved for me is that I'd like to have the
> status flags synchronized between Gnus and the maildirs

You might find this useful for now:
http://article.gmane.org/gmane.emacs.gnus.general/55100

> I was not yet able to figure out which of the possible marks from
> <URL:http://www.gnus.org/manual/gnus_64.html> are actually used and
> stored on disk by nnmaildir

The ones I know of are 'dormant, 'expire, 'forward, 'read, 'reply,
'save, and 'tick.  Note that there is no one-to-one correspondence
between the "marks" that appear in the user interface and the "marks"
that are stored persistently (either by Gnus or by a specific
backend).  For example, "r", "R", and "O" are all represented by the
'read mark in the persistent storage.

> for the others (dormant, ...)  we could either try to convince DJB
> to add them to the specification or the 'experimental semantics'
> described above could be used.

The experimental semantics wouldn't be useful; that would mean that
the message's info would look like ":1,..." which other MUAs wouldn't
understand.

paul