>> .if x versus .ifx Having `.if x' instead of a new keyword `.ifx' is appealing to me. Assuming that we have a global register to activate a novel interpretation of expressions (as suggested by Colin), we could indeed simply stay with the currently available keywords. A similar approach is already used by Heirloom troff to define various extensions.
Note, however, that it gets tricky if groff tries to execute `modern'
macros in compatibility mode (.cp 0), cf. `.de1' and friends.
Werner
