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diff --git a/aapl/avlitree.h b/aapl/avlitree.h
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+/*
+ *  Copyright 2002 Adrian Thurston <thurston@complang.org>
+ */
+
+/*  This file is part of Aapl.
+ *
+ *  Aapl 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.
+ *
+ *  Aapl 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 Aapl; if not, write to the Free Software Foundation, Inc., 59
+ *  Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _AAPL_AVLITREE_H
+#define _AAPL_AVLITREE_H
+
+#include "compare.h"
+#include "dlistmel.h"
+
+/**
+ * \addtogroup avlitree
+ * @{
+ */
+
+/**
+ * \class AvliTree
+ * \brief Linked AVL tree.
+ *
+ * AvliTree is the standard linked by-structure AVL tree. To use this
+ * structure the user must define an element type and give it the necessary
+ * properties. At the very least it must have a getKey() function that will be
+ * used to compare the relative ordering of elements and tree management data
+ * necessary for the AVL algorithm. An element type can acquire the management
+ * data by inheriting the AvliTreeEl class.
+ *
+ * AvliTree does not presume to manage the allocation of elements in the tree.
+ * The destructor will not delete the items in the tree, instead the elements
+ * must be explicitly de-allocated by the user if necessary and when it is
+ * safe to do so. The empty() routine will traverse the tree and delete all
+ * items. 
+ *
+ * Since the tree does not manage the elements, it can contain elements that
+ * are allocated statically or that are part of another data structure.
+ *
+ * \include ex_avlitree.cpp
+ */
+
+/*@}*/
+
+#define BASE_EL(name) name
+#define BASEKEY(name) name
+#define BASELIST DListMel< Element, AvliTreeEl<Element> >
+#define AVLMEL_CLASSDEF class Element, class Key, class Compare = CmpOrd<Key>
+#define AVLMEL_TEMPDEF class Element, class Key, class Compare
+#define AVLMEL_TEMPUSE Element, Key, Compare
+#define AvlTree AvliTree
+#define WALKABLE
+
+#include "avlcommon.h"
+
+#undef BASE_EL
+#undef BASEKEY
+#undef BASELIST
+#undef AVLMEL_CLASSDEF
+#undef AVLMEL_TEMPDEF
+#undef AVLMEL_TEMPUSE
+#undef AvlTree
+#undef WALKABLE
+
+#endif /* _AAPL_AVLITREE_H */