anchor.diff:  //
  -// Grammer for path expressions
  +// Grammar for path expressions
   //
   
   header {
  
positive.code: IDENTIFIER
      :  ('a'..'z'|'_') ('a'..'z'|'_'|'0'..'9')*
      ;
      
  
negative.code:     : IDENTIFIER
      | bracketedExpr
      ;
  
  bracketedExpr
      : OPEN_PAREN! orExpr CLOSE_PAREN!
      ;
  