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diff --git a/src/analysis/scan/expr.h b/src/analysis/scan/expr.h
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+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * expr.h - prototypes pour la définition d'une expression servant aux conditions de correspondance
+ *
+ * Copyright (C) 2022 Cyrille Bagard
+ *
+ *  This file is part of Chrysalide.
+ *
+ *  Chrysalide is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Chrysalide is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#ifndef _ANALYSIS_SCAN_EXPR_H
+#define _ANALYSIS_SCAN_EXPR_H
+
+
+#include <glib-object.h>
+#include <stdbool.h>
+
+
+#include "context.h"
+#include "scope.h"
+
+
+
+#define G_TYPE_SCAN_EXPRESSION            g_scan_expression_get_type()
+#define G_SCAN_EXPRESSION(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), G_TYPE_SCAN_EXPRESSION, GScanExpression))
+#define G_IS_SCAN_EXPRESSION(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), G_TYPE_SCAN_EXPRESSION))
+#define G_SCAN_EXPRESSION_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), G_TYPE_SCAN_EXPRESSION, GScanExpressionClass))
+#define G_IS_SCAN_EXPRESSION_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), G_TYPE_SCAN_EXPRESSION))
+#define G_SCAN_EXPRESSION_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj), G_TYPE_SCAN_EXPRESSION, GScanExpressionClass))
+
+
+/* Expression d'évaluation généraliste (instance) */
+typedef struct _GScanExpression GScanExpression;
+
+/* Expression d'évaluation généraliste (classe) */
+typedef struct _GScanExpressionClass GScanExpressionClass;
+
+
+/* Etat de l'expression vis à vis des réductions */
+typedef enum _ScanReductionState
+{
+    SRS_PENDING,                            /* Nature à déterminer         */
+    SRS_REDUCED,                            /* Nature compacte finale      */
+    SRS_WAIT_FOR_SCAN,                      /* Nature vouée à évoluer      */
+    SRS_UNRESOLVABLE,                       /* Nature indéterminable       */
+
+} ScanReductionState;
+
+
+/* Indique le type défini pour une expression de validation. */
+GType g_scan_expression_get_type(void);
+
+/* Indique l'état de réduction d'une expression. */
+ScanReductionState g_scan_expression_get_state(const GScanExpression *);
+
+/* Réduit une expression à une forme plus simple. */
+ScanReductionState g_scan_expression_reduce(GScanExpression *, GScanContext *, GScanScope *, GScanExpression **);
+
+/* Réduit une expression à une forme booléenne. */
+bool g_scan_expression_reduce_to_boolean(GScanExpression *, GScanContext *, GScanScope *, GScanExpression **);
+
+/* Détermine si l'expression peut représenter un ensemble. */
+bool g_scan_expression_handle_set_features(const GScanExpression *);
+
+/* Dénombre les éléments portés par une expression. */
+bool g_scan_expression_count_items(const GScanExpression *, GScanContext *, size_t *);
+
+/* Fournit un élément donné issu d'un ensemble constitué. */
+bool g_scan_expression_get_item(const GScanExpression *, size_t, GScanContext *, GScanExpression **);
+
+/* Réalise l'intersection entre deux ensembles. */
+GScanExpression *g_scan_expression_intersect(GScanExpression *, const GScanExpression *, GScanContext *, GScanScope *);
+
+
+
+#endif  /* _ANALYSIS_SCAN_EXPR_H */