[OT] Professional Prolog

[Simon Wilcox]

Nothing to do with Perl this but that never usually stops anyone :-)

Does anybody know of any companies that can provide support and 
development for Prolog based systems ?

This is *ahem* for a friend *cough* I have no more details than that, 
I'm assuming it's some sort of expert system but that's just a wild guess.

Any first hand recommendations would be very welcome.

Simon.