MML editing improvements (was: Wishlist for oGnus)

[Toby Speight <Toby.Speight@streapadair.freeserve.co.uk>]

Kai> Kai Großjohann <URL:mailto:Kai.Grossjohann@CS.Uni-Dortmund.DE>

0> In article <vafvh4nmvmv.fsf@lucy.cs.uni-dortmund.de>, Kai wrote:

Kai> * Improve editing of MIME messages.  I would like to use html-mode
Kai>   to edit the body of a text/html message, and enriched-mode
Kai>   for text/enriched messages, and so on.  This should go for
Kai>   multipart messages as well.  This is probably a hard one
Kai>   since Emacs currently does not allow several major modes per
Kai>   buffer.

One buffer per part?  Perhaps not ideal for all, but good enough for me.

Kai> * Provide commands for editing MML tags.  For example, there
Kai>   could be a command mml-add-tag-attribute which prompts me for
Kai>   an attribute name (with completion, from the set filename,
Kai>   type, ...), and then for a value.  (This is like `C-c +' in
Kai>   psgml.)  Or there could be a command which showed me all the
Kai>   attributes in an MML tag and allows me to use TAB to move
Kai>   between them, and then to edit each attribute value.  (This is
Kai>   like `C-c C-a' in psgml.)

That would be good.  A suggested interface: make the MML tag read-only
(and perhaps give it some other text property so that we can write
tag-like things in messages without confusing Message - don't know if
we can get this saved in drafts, though) and give it a local keymap so
that, say, RET gives a Customize buffer to edit the attributes.  Not
everyone thinks Customize is the greatest, but it does have the
advantage of making the user-interface consistent across packages.