Hi all, again, a question about xparse, still hoping this is the right list for that. I want to do something like \NewDocumentCommand\mycommand{O{#2}m}{#1 and #2.} which should give the same result for \mycommand[a]{a} and \mycommand{a}, i.e. “#1 is equal to #2 if #1 is not given“. Is there a simple way to do this to avoid an if-construct: \IfNoValue{#1}{\def\temp{#2}}{\def\temp{#1}} and then use \temp instead of #1? If not, would this be possible (and wanted) to be implemented? cheers Arno