The points that were mentioned on the CLIPS history page were 'compatibility' and 'syntax'. I would guess to be compatible one would need to know both syntax a

The points that were mentioned on the CLIPS history page were 'compatibility' and 'syntax'. I would guess to be compatible one would need to know both syntax and semantics (what the constructs are doing and how a rule system executes the rules) of the constructs of ART. Having access to documentation and actual implementations helps with that. I never did say anything about source code or performance. I would also not think that people were stupid - especially since they were smart enough to develop expert systems.