User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2.15)
            Gecko/20110303 Thunderbird/3.1.9
MIME-Version: 1.0
References: <4D738DB1.3020807@gmx.de>           
            <19831.22704.372331.894399@morse.mittelbach-online.de>           
            <56ED2B8C-74D6-4163-A98C-52B8CA052724@frycomm.com>           
            <C3D0B824-A368-4433-8EA1-AD8E3D3D48ED@yahoo.de>
            <F7F52A1C-00A0-4F79-8C17-84CC28CE7C2D@frycomm.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Message-ID:  <4D77B6E9.8060008@morningstar2.co.uk>
Date:         Wed, 9 Mar 2011 17:20:41 +0000
Reply-To: Mailing list for the LaTeX3 project
              <LATEX-L@listserv.uni-heidelberg.de>
Sender: Mailing list for the LaTeX3 project <LATEX-L@listserv.uni-heidelberg.de>
From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: format?
To: LATEX-L@listserv.uni-heidelberg.de
In-Reply-To:  <F7F52A1C-00A0-4F79-8C17-84CC28CE7C2D@frycomm.com>
Precedence: list
Status: R

On 09/03/2011 17:07, William Adams wrote:
>> I thought about this issue, but how should this be done on the technical level? Once you have defined a TeX macro, there is no way to "deactivate" it. I had the hope that it would be possible to require either \NeedsTeXFormat{LaTeX2x} or \usepackage{expl3...}, but I don't think there is a simple way to do this.
> 
> Okay, how about one defines all the macros using in-accessible names, then the \usepackage call \lets them to the proper, accessible names? This should still give the desired time-savings while requiring that \usepackage be called.

At least in the case of expl3 + xparse + xtemplate, the macros only get
used if you actively want to anyway. (Galley-related stuff is
different.) So I'm unclear on what one wants to 'activate', quite apart
from the technical questions.
-- 
Joseph Wrig