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diff --git a/gee/sortedmap.vala b/gee/sortedmap.vala
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+/* sortedset.vala
+ *
+ * Copyright (C) 2009-2011  Maciej Piechotka
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library 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
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ * 	Maciej Piechotka <uzytkownik2@gmail.com>
+ */
+
+public interface Gee.SortedMap<K,V> : Gee.Map<K,V> {
+	/**
+	 * Returns map containing pairs with key strictly lower the the argument.
+	 */
+	public abstract SortedMap<K,V> head_map (K before);
+
+	/**
+	 * Returns map containing pairs with key equal or larger then the argument.
+	 */
+	public abstract SortedMap<K,V> tail_map (K after);
+
+	/**
+	 * Returns right-open map (i.e. containing all pair which key is strictly
+	 * lower then the second argument and equal or bigger then the first one).
+	 *
+	 * Null as one parameter means that it should include all from this side.
+	 */
+	public abstract SortedMap<K,V> sub_map (K before, K after);
+
+	/**
+	 * Returns the keys in ascending order.
+	 */
+	public abstract SortedSet<K> ascending_keys { owned get; }
+
+	/**
+	 * Returns the entries in ascending order.
+	 */
+	public abstract SortedSet<Map.Entry<K,V>> ascending_entries { owned get; }
+
+	/**
+	 * The read-only view this map.
+	 */
+	public new abstract SortedMap<K,V> read_only_view { owned get; }
+
+	/**
+	 * Returns an immutable empty map.
+	 *
+	 * @return an immutable empty map
+	 */
+	public static Map<K,V> empty<K,V> () {
+		return new TreeMap<K,V> ().read_only_view;
+	}
+}
+