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diff --git a/glib/grel.h b/glib/grel.h
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+++ b/glib/grel.h
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+/* GLIB - Library of useful routines for C programming
+ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * 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 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/*
+ * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
+ * file for a list of people on the GLib Team.  See the ChangeLog
+ * files for a list of changes.  These files are distributed with
+ * GLib at ftp://ftp.gtk.org/pub/gtk/. 
+ */
+
+#ifndef __G_REL_H__
+#define __G_REL_H__
+
+#include <gtypes.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GRelation       GRelation;
+typedef struct _GTuples         GTuples;
+
+struct _GTuples
+{
+  guint len;
+};
+
+/* GRelation
+ *
+ * Indexed Relations.  Imagine a really simple table in a
+ * database.  Relations are not ordered.  This data type is meant for
+ * maintaining a N-way mapping.
+ *
+ * g_relation_new() creates a relation with FIELDS fields
+ *
+ * g_relation_destroy() frees all resources
+ * g_tuples_destroy() frees the result of g_relation_select()
+ *
+ * g_relation_index() indexes relation FIELD with the provided
+ *   equality and hash functions.  this must be done before any
+ *   calls to insert are made.
+ *
+ * g_relation_insert() inserts a new tuple.  you are expected to
+ *   provide the right number of fields.
+ *
+ * g_relation_delete() deletes all relations with KEY in FIELD
+ * g_relation_select() returns ...
+ * g_relation_count() counts ...
+ */
+
+GRelation* g_relation_new     (gint         fields);
+void       g_relation_destroy (GRelation   *relation);
+void       g_relation_index   (GRelation   *relation,
+                               gint         field,
+                               GHashFunc    hash_func,
+                               GCompareFunc key_compare_func);
+void       g_relation_insert  (GRelation   *relation,
+                               ...);
+gint       g_relation_delete  (GRelation   *relation,
+                               gconstpointer  key,
+                               gint         field);
+GTuples*   g_relation_select  (GRelation   *relation,
+                               gconstpointer  key,
+                               gint         field);
+gint       g_relation_count   (GRelation   *relation,
+                               gconstpointer  key,
+                               gint         field);
+gboolean   g_relation_exists  (GRelation   *relation,
+                               ...);
+void       g_relation_print   (GRelation   *relation);
+
+void       g_tuples_destroy   (GTuples     *tuples);
+gpointer   g_tuples_index     (GTuples     *tuples,
+                               gint         index,
+                               gint         field);
+
+G_END_DECLS
+
+#endif /* __G_REL_H__ */
+