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diff --git a/src/libstrongswan/utils/enumerator.h b/src/libstrongswan/utils/enumerator.h
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+++ b/src/libstrongswan/utils/enumerator.h
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+/**
+ * @file enumerator.h
+ * 
+ * @brief Interface of enumerator_t.
+ * 
+ */
+
+/*
+ * Copyright (C) 2007 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 ENUMERATOR_H_
+#define ENUMERATOR_H_
+
+#include <library.h>
+
+typedef struct enumerator_t enumerator_t;
+
+/**
+ * @brief Enumerate is simpler, but more flexible than iterator.
+ */
+struct enumerator_t {
+
+	/**
+	 * @brief Enumerate collection.
+	 *
+	 * The enumerate function takes a variable argument list containing 
+	 * pointers where the enumerated values get written.
+	 *
+	 * @param ...	variable list of enumerated items, implementation dependant
+	 * @return		TRUE if pointers returned
+	 */
+	bool (*enumerate)(enumerator_t *this, ...);
+		
+	/**
+     * @brief Destroy a enumerator instance.
+     */
+    void (*destroy)(enumerator_t *this);
+};
+
+/**
+ * @brief Create an enumerator which enumerates over nothing
+ */
+enumerator_t* enumerator_create_empty();
+
+#endif /* ENUMERATOR_H_ */