about vs. ID

From: Drew McDermott (drew.mcdermott@yale.edu)
Date: 12/14/00 

I thought that ID="..." was used to introduce a new constant, and
about="..." was used to refer to an old one.  But I see in some of the
homework 1 submissions that many people just use "about" everywhere.
Could someone explain the distinction better?

Thanks.

                                             -- Drew McDermott

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