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Message-ID:  <4C5EDBDB.6050607@morningstar2.co.uk>
Date:         Sun, 8 Aug 2010 17:31:23 +0100
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From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: optional (#1:#2) with xparse
To: LATEX-L@listserv.uni-heidelberg.de
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Status: R

On 08/08/2010 13:50, Arno Trautmann wrote:
>> Parse the argument first as a 'd', then use \SplitArgument to do the
>> subsequent work:
>
> Nice, I totally forgot about the \SplitArgument …

Just for the 'list record', I should have said earlier that the point 
here is that the '( ... )' is the optional part (and hence 'd' 
specification). Once it is there, then further processing is required, 
which is where \SplitArgument comes in.

> Thanks for your quick answer, that works fine. But unfortunately it does
> not solve my problem due to other reasons.

Could we have a clue :-)
-- 
Joseph Wright