From: horand.gassmann@googlemail.com   
      
   I am working on a large project with multiple parsers for several   
   different XML files. Some of the elements and types in the XML schemas   
   are identical, and I would like to share some of the parser code. I am   
   working in flex/bison and am wondering if there is a way to use   
   include files for bison.   
      
   I understand that I can use #include in the C code section, but this   
   is not what I am talking about. I want to set aside some repeated   
   grammar rules into a separate file and then "paste" that file into   
   several bison parsers via an include statement. Is this sort of thing   
   possible?  How would I do it?   
      
   Thanks   
      
   gus gassmann   
   [I'd use m4 as a preprocessor and feed its output to bison. -John]   
      
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