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diff --git a/examples/query/Database.gf b/examples/query/Database.gf
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+-- abstract syntax of a small arithmetic query language
+
+abstract Database = {
+
+cat 
+  Query ; S ; Q ; NP ; CN ; PN ; A1 ; A2 ;
+
+fun 
+  QueryS : S -> Query ; 
+  QueryQ : Q -> Query ;
+
+  PredA1  : NP -> A1 -> S ;
+
+  WhichA1 : CN -> A1 -> Q ;
+  WhichA2 : CN -> NP -> A2 -> Q ;
+
+  ComplA2 : A2 -> NP -> A1 ;
+  UseInt  : Int -> NP ;
+
+  Every   : CN -> NP ;
+  Some    : CN -> NP ;
+
+-- lexicon
+
+  Number : CN ;
+  Even,Odd,Prime : A1 ;
+  Equal,Greater,Smaller,Divisible  : A2 ;
+
+-- replies
+
+cat Answer ; ListInt ;
+
+fun
+  Yes,No : Answer ;
+  None : Answer ;
+  List : ListInt -> Answer ;
+  One : Int -> ListInt ;
+  Cons : Int -> ListInt -> ListInt ;
+
+-- general moves
+fun
+  Quit : Query ;
+  Bye : Answer ;
+
+}