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diff --git a/src/libstrongswan/resolver/rr_set.h b/src/libstrongswan/resolver/rr_set.h
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+/*
+ * Copyright (C) 2012 Reto Guadagnini
+ * 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.
+ */
+
+/**
+ * @defgroup rr_set rr_set
+ * @{ @ingroup resolver
+ */
+
+#ifndef RR_SET_H_
+#define RR_SET_H_
+
+typedef struct rr_set_t rr_set_t;
+
+#include <library.h>
+#include <collections/enumerator.h>
+#include <collections/linked_list.h>
+
+/**
+ * A set of DNS Resource Records.
+ *
+ * Represents a RRset as defined in RFC 2181. This RRset consists of a set of
+ * Resource Records with the same label, class and type but different data.
+ *
+ * The DNSSEC signature Resource Records (RRSIGs) which sign the RRs of this set
+ * are also part of an object of this type.
+ */
+struct rr_set_t {
+
+	/**
+	 * Create an enumerator over all Resource Records of this RRset.
+	 *
+	 * @note The enumerator's position is invalid before the first call
+	 * to enumerate().
+	 *
+	 * @return			enumerator over Resource Records
+	 */
+	enumerator_t *(*create_rr_enumerator)(rr_set_t *this);
+
+	/**
+	 * Create an enumerator over all RRSIGs of this RRset
+	 *
+	 * @note The enumerator's position is invalid before the first call
+	 * to enumerate().
+	 *
+	 * @return			enumerator over RRSIG Resource Records,
+	 * 					NULL if there are no RRSIGs for this RRset
+	 */
+	enumerator_t *(*create_rrsig_enumerator)(rr_set_t *this);
+
+	/**
+	 * Destroy this RRset with all its Resource Records.
+	 */
+	void (*destroy) (rr_set_t *this);
+};
+
+/**
+ * Create an rr_set instance.
+ *
+ * @param list_of_rr		list of Resource Records which form this RRset
+ * @param list_of_rrsig		list of the signatures (RRSIGs) of the
+ * 							Resource Records of this set
+ * @return					Resource Record set, NULL on failure
+ */
+rr_set_t *rr_set_create(linked_list_t *list_of_rr,
+						linked_list_t *list_of_rrsig);
+
+#endif /** RR_SET_H_ @}*/