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+--# -path=.:prelude
+
+concrete DatabaseEng of Database = open Prelude in {
+
+-- english query language
+
+flags lexer=literals ; unlexer=text ;
+
+-- concrete syntax; greatly simplified - just for test purposes
+
+lin
+ QueryS s = s ;
+ QueryQ q = q ;
+
+ PredA1 np a = prefixSS "is" (cc2 np a) ;
+
+ WhichA1 n a = ss ("which" ++ n.s ++ "are" ++ a.s) ;
+ WhichA2 n q a = ss ("which" ++ n.s ++ "are" ++ q.s ++ a.s) ;
+
+ ComplA2 = cc2 ;
+
+ Every A = ss ("every" ++ A.s) ;
+ Some A = ss ("some" ++ A.s) ;
+ UseInt n = n ;
+
+ Number = ss "numbers" ;
+
+ Even = ss "even" ;
+ Odd = ss "odd" ;
+ Prime = ss "prime" ;
+ Equal = ss ("equal" ++ "to") ;
+ Greater = ss ("greater" ++ "than") ;
+ Smaller = ss ("smaller" ++ "than") ;
+ Divisible = ss ("divisible" ++ "by") ;
+
+-- replies
+
+lin
+ Yes = ss "yes" ;
+ No = ss "no" ;
+
+ None = ss "none" ;
+ List xs = xs ;
+ One n = n ;
+ Cons = cc2 ;
+
+-- general moves
+
+lin
+ Quit = ss "quit" ;
+ Bye = ss "bye" ;
+}