From: santos.lf@gmail.com   
      
   Hi all,   
      
   I'm going to develop an expert system. I would like to know what is the   
   most used way to represent knowledge in current systems and what are   
   the major advantages and drawbacks of each option, like if-then rules,   
   frames, semantic networks,...   
      
   Thanks in advance,   
   Filipe.   
      
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