From: askmeformymail@thanks.com   
      
   Hello,   
      
   I study the possibility of parsing context-free languages with Prolog.   
      
   Head -> Body   
      
   I found the DCG (definite clause grammar).   
      
   I think that is possible with Prolog to handle context-sensitive construct :   
      
   before Head after -> before Body after   
      
   but I seek a *good* exemple in Prolog, perhaps with the langage { a^n   
   b^n c^n } that is known to be context-sensitive (and not context-free).   
      
   Thanks :-)   
      
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