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