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Re: enriched-mode and switching major modes.

From: Stefan
Subject: Re: enriched-mode and switching major modes.
Date: Thu, 23 Sep 2004 07:35:36 -0400
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3.50 (darwin)

>     Without thinking too much about it, I'd say that overlays seem to be
>     a better fit: each node is an overlay, the node's attributes can be stored
>     in the overlay's properties, the text corresponding to a node can be 
> stored
>     directly in the buffer and retrieved by (buffer-substring (overlay-start 
> o)
>     (overlay-end o)), ...

> Overlays are no good for this because they will be lost completely
> if you cut and paste.  If you copy the text of a buffer
> to another buffer, the overlays won't come along.  (That is the purpose
> of overlays.)

> This information has to be *part of the text*.

XEmacs's version of overlays (called extents) can be part of the text
(which is a property they call `duplicable').  We could do the same.


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