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diff --git a/aapl/avlimel.h b/aapl/avlimel.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_AVLIMEL_H
+#define _AAPL_AVLIMEL_H
+
+#include "compare.h"
+#include "dlistmel.h"
+
+/**
+ * \addtogroup avlitree 
+ * @{
+ */
+
+/**
+ * \class AvliMel
+ * \brief Linked AVL tree for element appearing in multiple trees.
+ *
+ * AvliMel allows for an element to simultaneously be in multiple trees without
+ * the trees interferring with one another. For each tree that the element is
+ * to appear in, there must be a distinct set of AVL Tree management data that
+ * can be unambiguously referenced with some base class name. This name
+ * is passed to the tree as a template parameter and is used in the tree
+ * algorithms.
+ *
+ * The element must use the same key type and value in each tree that it
+ * appears in. If distinct keys are required, the AvliMelKey structure is
+ * available.
+ *
+ * AvliMel does not assume ownership of elements in the tree. The destructor
+ * will not delete the elements. If the user wishes to explicitly deallocate
+ * all the items in the tree the empty() routine is available. 
+ *
+ * \include ex_avlimel.cpp
+ */
+
+/*@}*/
+
+#define BASE_EL(name) BaseEl::name
+#define BASEKEY(name) name
+#define BASELIST DListMel< Element, BaseEl >
+#define AVLMEL_CLASSDEF class Element, class Key, \
+		class BaseEl, class Compare = CmpOrd<Key>
+#define AVLMEL_TEMPDEF class Element, class Key, \
+		class BaseEl, class Compare
+#define AVLMEL_TEMPUSE Element, Key, BaseEl, Compare
+#define AvlTree AvliMel
+#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_AVLIMEL_H */