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diff --git a/src/libical/icalperiod.h b/src/libical/icalperiod.h
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+/* -*- Mode: C -*- */
+/*======================================================================
+ FILE: icalperiod.h
+ CREATOR: eric 26 Jan 2001
+
+
+ $Id: icalperiod.h,v 1.6 2008-01-15 23:17:41 dothebart Exp $
+ $Locker:  $
+
+ (C) COPYRIGHT 2000, Eric Busboom <eric@softwarestudio.org>
+     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/
+
+ The Original Code is eric. The Initial Developer of the Original
+ Code is Eric Busboom
+
+
+======================================================================*/
+
+#ifndef ICALPERIOD_H
+#define ICALPERIOD_H
+
+#include "icaltime.h"
+#include "icalduration.h"
+
+struct icalperiodtype 
+{
+	struct icaltimetype start; 
+	struct icaltimetype end; 
+	struct icaldurationtype duration;
+};
+
+struct icalperiodtype icalperiodtype_from_string (const char* str);
+
+const char* icalperiodtype_as_ical_string(struct icalperiodtype p);
+char* icalperiodtype_as_ical_string_r(struct icalperiodtype p);
+
+struct icalperiodtype icalperiodtype_null_period(void);
+
+int icalperiodtype_is_null_period(struct icalperiodtype p);
+
+int icalperiodtype_is_valid_period(struct icalperiodtype p);
+
+#endif /* !ICALTIME_H */
+
+
+