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diff --git a/src/libicalss/icalspanlist.h b/src/libicalss/icalspanlist.h
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+/* -*- Mode: C -*- */
+/*======================================================================
+ FILE: icalspanlist.h
+ CREATOR: eric 21 Aug 2000
+
+
+ $Id: icalspanlist.h,v 1.8 2008-01-02 20:07:42 dothebart Exp $
+ $Locker:  $
+
+ (C) COPYRIGHT 2000, Eric Busboom, http://www.softwarestudio.org
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of either: 
+
+    The LGPL as published by the Free Software Foundation, version
+    2.1, available at: http://www.fsf.org/copyleft/lesser.html
+
+  Or:
+
+    The Mozilla Public License Version 1.0. You may obtain a copy of
+    the License at http://www.mozilla.org/MPL/
+
+
+ =========================================================================*/
+#ifndef ICALSPANLIST_H
+#define ICALSPANLIST_H
+
+#include <libical/ical.h>
+#include "icalset.h"
+
+/** @file icalspanlist.h
+ *  @brief Code that supports collections of free/busy spans of time
+ */
+
+typedef struct icalspanlist_impl icalspanlist;
+
+
+/** @brief Constructor
+ * Make a free list from a set of component. Start and end should be in UTC 
+ */
+
+icalspanlist* icalspanlist_new(icalset *set, 
+				struct icaltimetype start,
+				struct icaltimetype end);
+
+/** @brief Destructor
+ */
+void icalspanlist_free(icalspanlist* spl);
+
+/* Unimplemented functions */
+icalcomponent* icalspanlist_make_free_list(icalspanlist* sl);
+icalcomponent* icalspanlist_make_busy_list(icalspanlist* sl);
+
+/** Get first next free time after time t. all times are in UTC. */
+struct icalperiodtype icalspanlist_next_free_time(icalspanlist* sl,
+						struct icaltimetype t);
+/** Get first next busy time after time t. all times are in UTC. */
+struct icalperiodtype icalspanlist_next_busy_time(icalspanlist* sl,
+						struct icaltimetype t);
+
+void icalspanlist_dump(icalspanlist* s);
+
+/** @brief Return a valid VFREEBUSY component for this span */
+icalcomponent *icalspanlist_as_vfreebusy(icalspanlist* s_in,
+					 const char* organizer,
+					 const char* attendee);
+
+/** @brief Return an integer matrix of total events per delta_t timespan */
+int *icalspanlist_as_freebusy_matrix(icalspanlist* span, int delta_t);
+
+/** @brief Construct an icalspanlist from a VFREEBUSY component */
+icalspanlist *icalspanlist_from_vfreebusy(icalcomponent* c);
+
+#endif
+				    
+
+