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Message-ID:  <AC068C91-2917-414B-9DF9-46634CCCD856@gmail.com>
Date:         Thu, 6 Aug 2009 17:45:07 +0930
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From: Will Robertson <wspr81@GMAIL.COM>
Subject: Re: xparse
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
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Hi again,

Sorry for the flurry of posts.

On 06/08/2009, at 3:23 PM, Joseph Wright wrote:

> Will Robertson wrote:
>>
>> One comment I have here is that in the future I don't see many people
>> defining weird combinations of arguments due to the prevalence of
>> keyval-style argument processing instead. I'd even think about  
>> dropping
>> coordinate-style parenthesis input like "(x,y)" based on this. (Which
>> can be emulated easily enough with "d()" and a clist mapping in the  
>> input.)
>
> The main reason for keeping a letter for (x,y) is that it can be a
> mandatory argument in LaTeX2e, so needs special handling.


If all we're trying to do is be able to emulate LaTeX2e, is there  
anything wrong with writing something like this?:

     ... { d() }{
       \IfNoValueTF {#1} { \ERROR } {
         The real definition
       }
     }

Will
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