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RFC 2445 defines protocols for interoperability between calendar applications, and this library provides java implementations for a number of RFC 2445 primitives including those that describe how events repeat. Start by taking alook at the compat packages.

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// Copyright (C) 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.jresearch.ical.values;

/**
 * possible recurrence frequencies.  Names correspond to RFC2445 literals.
 *
 * According to section 4.3.10 of RFC 2445:
 * 
 * The FREQ rule part identifies the type of recurrence rule. This rule
 * part MUST be specified in the recurrence rule. Valid values include
 * SECONDLY, to specify repeating events based on an interval of a
 * second or more; MINUTELY, to specify repeating events based on an
 * interval of a minute or more; HOURLY, to specify repeating events
 * based on an interval of an hour or more; DAILY, to specify repeating
 * events based on an interval of a day or more; WEEKLY, to specify
 * repeating events based on an interval of a week or more; MONTHLY, to
 * specify repeating events based on an interval of a month or more; and
 * YEARLY, to specify repeating events based on an interval of a year or
 * more.
 * 
 *
 * @author [email protected] (Mike Samuel)
 */
public enum Frequency {
  // in order of increasing length
  SECONDLY,
  MINUTELY,
  HOURLY,
  DAILY,
  WEEKLY,
  MONTHLY,
  YEARLY,
  ;
}