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diff --git a/src/analysis/scan/item.h b/src/analysis/scan/item.h
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+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * item.h - prototypes pour la définition d'un élément appelable lors de l'exécution d'une règle
+ *
+ * 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_ITEM_H
+#define _ANALYSIS_SCAN_ITEM_H
+
+
+#include <glib-object.h>
+#include <stdbool.h>
+
+
+#include "context.h"
+#include "expr.h"
+
+
+
+#define G_TYPE_SCAN_REGISTERED_ITEM            g_scan_registered_item_get_type()
+#define G_SCAN_REGISTERED_ITEM(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), G_TYPE_SCAN_REGISTERED_ITEM, GScanRegisteredItem))
+#define G_IS_SCAN_REGISTERED_ITEM(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), G_TYPE_SCAN_REGISTERED_ITEM))
+#define G_SCAN_REGISTERED_ITEM_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), G_TYPE_SCAN_REGISTERED_ITEM, GScanRegisteredItemClass))
+#define G_IS_SCAN_REGISTERED_ITEM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), G_TYPE_SCAN_REGISTERED_ITEM))
+#define G_SCAN_REGISTERED_ITEM_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj), G_TYPE_SCAN_REGISTERED_ITEM, GScanRegisteredItemClass))
+
+
+/* Expression d'évaluation généraliste (instance) */
+typedef struct _GScanRegisteredItem GScanRegisteredItem;
+
+/* Expression d'évaluation généraliste (classe) */
+typedef struct _GScanRegisteredItemClass GScanRegisteredItemClass;
+
+
+/* Indique le type défini pour un élément appelable et enregistré. */
+GType g_scan_registered_item_get_type(void);
+
+/* Indique le nom associé à une expression d'évaluation. */
+char *g_scan_registered_item_get_name(const GScanRegisteredItem *);
+
+/* Lance une résolution d'élément à solliciter. */
+bool g_scan_registered_item_resolve(GScanRegisteredItem *, const char *, GScanContext *, GScanScope *, GScanRegisteredItem **);
+
+/* Réduit une expression à une forme plus simple. */
+bool g_scan_registered_item_reduce(GScanRegisteredItem *, GScanContext *, GScanScope *, GScanExpression **);
+
+/* Effectue un appel à une fonction enregistrée. */
+bool g_scan_registered_item_run_call(GScanRegisteredItem *, GScanExpression **, size_t, GScanContext *, GScanScope *, GObject **);
+
+/* Effectue une extraction d'élément à partir d'une série. */
+GObject *g_scan_registered_item_extract_at(GScanRegisteredItem *, GScanExpression *, GScanContext *, GScanScope *);
+
+
+
+#endif  /* _ANALYSIS_SCAN_ITEM_H */