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+open Sexplib.Std
+
+type function_predicate = {
+ name : string;
+ schema : (string * string) list;
+ symbol : string;
+ purity : Conventions.Purity.t;
+ cardinality : Conventions.Cardinality.t;
+}
+[@@deriving sexp]
+
+type statement =
+ | LoadLibrary of string
+ | DefineFunctionPredicate of function_predicate
+ | ListFunctionPredicates
+[@@deriving sexp]