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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: enriched-mode and switching major modes.
Date: Thu, 23 Sep 2004 05:29:46 -0400
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    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*.