From: hello@spamm.er   
      
   Anyone familiar with ILP (Inductive Logic Programming) probably knows that   
   it is a very Prolog-centric idea. ILP systems generate Prolog programs,   
   they use Prolog programs as background knowledge, training data is provided   
   in Prolog, and the induction phase itself uses many facilities built into   
   Prolog.   
      
   That's why I was surprised to find out that both ILP systems that I've heard   
   of (FOIL6 and PROGOL) are now [re-]written in C! The source code is, of   
   course, huge and looks completely unreadable, compared to, for example,   
   earlier FOIL in Prolog.   
      
   I consider ILP to be one of the most interesting achievements of AI, and one   
   of the most exemplary applications of Prolog, so why was C chosen as a host   
   language for it? Compiler availability can't possibly be an issue, because   
   Prolog programs are still used as input and output.   
      
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