X-VM-v5-Data: ([nil nil nil nil nil nil nil t nil]
	[nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil])
Date:         Mon, 11 Jun 90 16:18:35 CET
From: Rainer Schoepf <BK4@DHDURZ1.bitnet>
Organization: Inst. f. Theor. Physik d. Univ. Heidelberg
Subject:      Optional arguments and hooks
To: LaTeX-L Mailing list <LATEX-L@DHDURZ1.uucp>
In-Reply-To:  Message of Mon, 11 Jun 90 12:41:35 GMT from
 <CA_ROWLEY@VAX.ACS.OPEN.AC.UK>
Status: R
X-Status: 
X-Keywords:                  
X-UID: 130

Chris would like to remove all optional arguments, among other reasons
to avoid the error messages caused by a left square bracket at a point
where an optional argument may appear.  Actually, nearly all these
problems will disappear if spaces are longer permitted before [.  That
is easy to implement and fully covered by the explanation in the LaTeX
book.

Re hooks: does it matter whether a hook is a macro or a token register?
That is an implementation decision.  A simple \add@tohook is most
certainly not sufficient, as Chris pointed out we will need a way
to specify whether the addition is to be entered in front or in back.

At the moment I cannot see a need for something like \subtract@fromhook,
not in the concept of hook I have in mind.  If you find yourself wanting
this, you've already made a mistake )-;  A hook should be used, e.g., to
execute cleanup code.

Rainer