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 * 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
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package org.apache.cocoon;

 * This interface is implemented by those classes that change
 * their behavior/results over time (non-ergodic).
 * @author <a href="">Stefano Mazzocchi</a>
 * @author <a href="">Pierpaolo Fumagalli</a>
 * @version CVS $Id: 433543 2006-08-22 06:22:54Z crossley $
public interface Modifiable
     * Queries the class to estimate its ergodic period termination.
     * <br>
     * This method is called to ensure the validity of a cached product. It
     * is the class responsibility to provide the fastest possible
     * implementation of this method or, whether this is not possible and the
     * costs of the change evaluation is comparable to the production costs,
     * to return <b>true</b> directly with no further delay, thus reducing
     * the evaluation overhead to a minimum.
     * @return <b>true</b> if the class ergodic period is over and the class
     *         would behave differently if processed again, <b>false</b> if the
     *         resource is still ergodic so that it doesn't require
     *         reprocessing.
    boolean modifiedSince( long date );
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