Barry Jay writes:

Drawings and diagrams differ fundamentally on the issue of who decides the position of picture elements. In a drawing package the user decides, in a diagram the program decides.

Obviously there are many situations where control is shared in a limited way, but I believe that this difference is sufficiently fundamental to warrant separate packages and syntax for each purpose.

A sufficiently expressive drawing package would allow a diagram package to be implemented on top of it, rather than implementing both independently in TeX. (Cf. the implementation of LaTeX on top of TeX.) Personally, while I use category-diagram-like pictures, I also use pictures that are beyond the capabilities of any TeX package I know of. What I want (if I'm going to use TeX at all, but that's a separate theological issue) is a TeX-compatible drawing package that can do, say, at least everything that a program like MacDraw can do. For category diagrams, I find Paul Taylor's package sufficient. It's the only one I've used, so that isn't a comment on the relative merits of the others. -- ____ Richard Kennaway __\_ / School of Information Systems Internet: jrk@sys.uea.ac.uk \ X/ University of East Anglia uucp: ...mcsun!ukc!uea-sys!jrk \/ Norwich NR4 7TJ, U.K. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++