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diff --git a/lib/checks/default.ml b/lib/checks/default.ml
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+(** Default implementation which does nothing. 
+
+This module is expected to be used when you only need to implement an analyze
+over a limited part of the whole syntax. *)
+
+module S = Qsp_syntax.S
+module T = Qsp_syntax.T
+module Report = Qsp_syntax.Report
+
+module type T = sig
+  type t
+
+  val default : t
+end
+
+module Expression (T' : T) = struct
+  (** 
+      Describe a variable, using the name in capitalized text, and an optionnal
+      index.
+
+      If missing, the index should be considered as [0].
+   *)
+
+  type t' = T'.t
+
+  let ident : (S.pos, T'.t) S.variable -> T'.t = fun _ -> T'.default
+
+  (*
+        Basic values, text, number…
+   *)
+
+  let integer : S.pos -> string -> T'.t = fun _ _ -> T'.default
+  let literal : S.pos -> T'.t T.literal list -> T'.t = fun _ _ -> T'.default
+
+  (** Call a function. The functions list is hardcoded in lib/lexer.mll *)
+  let function_ : S.pos -> T.function_ -> T'.t list -> T'.t =
+   fun _ _ _ -> T'.default
+
+  (** Unary operator like [-123] or [+'Text']*)
+  let uoperator : S.pos -> T.uoperator -> T'.t -> T'.t = fun _ _ _ -> T'.default
+
+  (** Binary operator, for a comparaison, or an operation *)
+  let boperator : S.pos -> T.boperator -> T'.t -> T'.t -> T'.t =
+   fun _ _ _ _ -> T'.default
+end