At 14:07 21/04/2004, you wrote: >In effect, we could have > \xtxpicfile as the hard one, >with \let\picfile\xtxpicfile implemented by default. such a def is upto the macro package, (most packages implement more advanced schemes anyway), so better is: \ifx\picfile\undefined \let\picfile\xtxpicfile \fi Hans