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From: Richard Stallman <rms@gnu.org>
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Subject: Re: emacs and guile (Re: ehelp woes, or why I hate a module that I love so much)
Date: Fri, 19 Jul 2002 18:35:09 -0600 (MDT)
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    For additional fields, there is 'make-object-property'.  This function
    returns a procedure-with-setter so that can you do, for example,

	(define symbol-foo (make-object-property))

	(symbol-foo 'x)
	=> #f
	(set! (symbol-foo 'x) 123)
	(symbol-foo 'x)
	=> 123

    make-object-property is implemented with a hash table of alists.

If Emacs needs any more than the function and the plist, 
we should provide additional slots in the symbol itself,
or a facility to for an application that uses Guile to request
more of them.