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diff --git a/comm/calendar/base/public/calIEvent.idl b/comm/calendar/base/public/calIEvent.idl
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+++ b/comm/calendar/base/public/calIEvent.idl
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+/* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "calIItemBase.idl"
+
+interface calIDuration;
+
+//
+// calIEvent
+//
+// An interface for an event (analogous to a VEVENT)
+//
+
+[scriptable, uuid(5ab15c1c-e295-4d8e-a9a9-ba5bc848b59a)]
+interface calIEvent : calIItemBase
+{
+  // these attributes are marked readonly, as the calIDates are owned
+  // by the event; however, the actual calIDate objects are not read
+  // only and are intended to be manipulated to adjust dates.
+
+  /**
+   * The (inclusive) start of the event.
+   */
+  attribute calIDateTime startDate;
+
+  /**
+   * The (non-inclusive) end of the event.
+   * Note that for all-day events, non-inclusive means that this will be set
+   * to the day after the last day of the event.
+   * If startDate.isDate is set, endDate.isDate must also be set.
+   */
+  attribute calIDateTime endDate;
+
+  /**
+   * The duration of the event.
+   * equal to endDate - startDate
+   */
+  readonly attribute calIDuration duration;
+
+};