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what does '.' do in (visible . t)?


From: leon
Subject: what does '.' do in (visible . t)?
Date: Sun, 04 Dec 2005 14:39:41 +0000
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

Hi guys,

Here is an expression of lisp that I don't know what it means.
     (visible . t)

Could someone explain the function of '.' a bit?
Thanks in advance.

-- 
.:*~*:._.:*~*:._.:*~*:._.:*~*:._.:*~*:._.:*~*:.
.     *                                       .
.    /.\  excuses are the easiest things      .
.   /..'\     to manufacture                  .
.   /'.'\   and the hardest things to sell    .
.  /.''.'\                                    .
.  /.'.'.\                                    .
. /'.''.'.\                                   .
. ^^^[_]^^^                                   .
.                                             .
.Leon                                         .
.:*~*:._.:*~*:._.:*~*:._.:*~*:._.:*~*:._.:*~*:.


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