Am 21.04.2011 um 12:28 schrieb Verhaag, G.C.H.M.:

Hi,

I try this example from the wiki page System Macros/Argument handling:

\def\dodefinesomething[#1][#2]%
{\getparameters[\??xx#1][#2]}

\def\definesomething%
{\dodoubleargumentwithset\dodefinesomething}

\starttext
\definesomething[alfa][variable=test]
\stoptext

Running this yields

! Undefined control sequence

I'm trying to write a few macros with optional delimited arguments with key-value sets and started reading the appropriate pages, but can't figure out why this example fails to run.

Anybody any idea?

I guess the message comes from your namespace which is in this form

only allowed in unprotected mode, to enter you need \unprotect before

and \protect after your command declarations. Another problem is that

you use a system namespace (two “?” and two letters) but for modules

we use now four “?” and also more than two letter, e.g.

\def\????something{@@@@something}

\def\definesomething

{\dodoubleargumentwithset\dodefinesomething}

\def\dodefinesomething[#1][#2]%

{\getparameters[\????something#1][#2]}

You should also take a look at the \definenamespace command which

creates the \define… and \setup… commands for you: