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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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.apache.poi.poifs.property;

/**
 * This interface defines methods for finding and setting sibling
 * Property instances
 *
 * @author Marc Johnson (mjohnson at apache dot org)
 */

public interface Child {
    /**
     * Get the next Child, if any
     *
     * @return the next Child; may return null
     */

    public Child getNextChild();

    /**
     * Get the previous Child, if any
     *
     * @return the previous Child; may return null
     */

    public Child getPreviousChild();

    /**
     * Set the next Child
     *
     * @param child the new 'next' child; may be null, which has the
     *              effect of saying there is no 'next' child
     */

    public void setNextChild(final Child child);

    /**
     * Set the previous Child
     *
     * @param child the new 'previous' child; may be null, which has
     *              the effect of saying there is no 'previous' child
     */

    public void setPreviousChild(final Child child);
}