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diff --git a/comm/calendar/base/public/calIRecurrenceRule.idl b/comm/calendar/base/public/calIRecurrenceRule.idl
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+++ b/comm/calendar/base/public/calIRecurrenceRule.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 "nsISupports.idl"
+
+#include "calIRecurrenceItem.idl"
+
+interface calIItemBase;
+interface calIDateTime;
+
+// an interface implementing a RRULE
+
+[scriptable, uuid(e965a91a-49fa-41b5-b668-1a824a73bdbf)]
+interface calIRecurrenceRule : calIRecurrenceItem
+{
+  //
+  // rule-based recurrence
+  //
+
+  // null/"", "SECONDLY", "MINUTELY", "HOURLY", "DAILY", "WEEKLY",
+  // "MONTHLY", "YEARLY"
+  attribute AUTF8String type;
+
+  // repeat every N of type
+  attribute long interval;
+
+  // These two are mutually exclusive; whichever is set
+  // invalidates the other.  It's only valid to read the one
+  // that was set; the other will throw NS_ERROR_FAILURE.  Use
+  // isByCount to figure out whether count or untilDate is valid.
+  // Setting count to -1 or untilDate to null indicates infinite
+  // recurrence.
+  attribute long count;
+  attribute calIDateTime untilDate;
+
+  // if this isn't infinite recurrence, this flag indicates whether
+  // it was set by count or not
+  readonly attribute boolean isByCount;
+
+  // The week start for this rule, used for certain calculations. This is a
+  // value from 0=Sunday to 6=Saturday.
+  attribute short weekStart;
+
+  // the components defining the recurrence
+  // "BYSECOND", "BYMINUTE", "BYHOUR", "BYDAY",
+  // "BYMONTHDAY", "BYYEARDAY", "BYWEEKNO", "BYMONTH",
+  // "BYSETPOS"
+  Array<short> getComponent (in AUTF8String aComponentType);
+  void setComponent (in AUTF8String aComponentType, in Array<short> aValues);
+
+};