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diff --git a/Source/charon/payloads/proposal_substructure.h b/Source/charon/payloads/proposal_substructure.h
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+++ b/Source/charon/payloads/proposal_substructure.h
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+/**
+ * @file proposal_substructure.h
+ * 
+ * @brief Declaration of the class proposal_substructure_t. 
+ * 
+ * An object of this type represents an IKEv2 PROPOSAL Substructure and contains transforms.
+ * 
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program 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.
+ */
+
+#ifndef PROPOSAL_SUBSTRUCTURE_H_
+#define PROPOSAL_SUBSTRUCTURE_H_
+
+
+#include "../types.h"
+#include "payload.h"
+
+/**
+ * Object representing an IKEv2- PROPOSAL SUBSTRUCTURE
+ * 
+ * The PROPOSAL SUBSTRUCTURE format is described in RFC section 3.3.1.
+ * 
+ */
+typedef struct proposal_substructure_s proposal_substructure_t;
+
+struct proposal_substructure_s {
+	/**
+	 * implements payload_t interface
+	 */
+	payload_t payload_interface;
+	
+	/**
+	 * @brief Destroys an proposal_substructure_t object.
+	 *
+	 * @param this 	proposal_substructure_t object to destroy
+	 * @return 		
+	 * 				SUCCESS in any case
+	 */
+	status_t (*destroy) (proposal_substructure_t *this);
+};
+
+/**
+ * @brief Creates an empty proposal_substructure_t object
+ * 
+ * @return			
+ * 					- created proposal_substructure_t object, or
+ * 					- NULL if failed
+ */
+ 
+proposal_substructure_t *proposal_substructure_create();
+
+
+
+#endif /*PROPOSAL_SUBSTRUCTURE_H_*/