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+type t
+
+val get_process_order : ImportConf.Syntax.t -> t list
+(** Extract the file list to process, following the identified dependancies.
+    Try to load first the document which does not required another spreadsheet,
+    and keep going in the topological order  
+
+    Raise [Unknown_source file] if a source is referenced but is not declared.
+    The order matter : the exception will be raised in a source is referenced
+    before the declaration (when chaining differents externals) *)
+
+val table : t -> ImportDataTypes.Table.t
+(** Get the table to proceed. *)
+
+val columns : t -> ImportContainers.IntSet.t
+(** A set of columns loaded in this table. Thoses columns may not need
+            reported in the final export. 
+
+            Each column is identified by is index in the Excel document. 
+
+            This set does not include the columns used in the keys. They can be
+            fetched with the [keys] function *)
+
+type key = {
+  name : string;  (** This is the name of the target table we are pointed to *)
+  expression : ImportDataTypes.Path.column ImportExpression.T.t;
+      (** The expression used as key *)
+  columns : ImportContainers.IntSet.t Lazy.t;
+      (** The list of columns used in the key. All the columns are referenced
+            in the expression. We can have many columns used inside a single
+            key when a function is used (for example for joining multiple
+            columns into a single key)  *)
+}
+(** This type describe the join key in a table. The name is the refering table
+    using this key (the key name in the datable is key_"name" ), and the
+    expression describe how to build the key. *)
+
+val keys : t -> key list
+(** [keys] is the list of columns pointed by another one. They are
+          considered as join key between the diffrent tables. *)