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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Creating recursive customization types / widgets
Date: Sun, 30 Nov 2003 20:45:10 -0500
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    (define-widget 'child 'default
      "Base widget for recursive datastructures.

    You need to set :type to the widget type for the datastructure you
    want to define, and set :match to a function that matches the
    datastructure.  If the datastructure is not recursive, you don't have
    to set :match."

It looks like a good feature, but I can't really understand
that doc string, so it needs to be somewhat clearer.