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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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package freemarker.cache;

import freemarker.template.Configuration;

/**
 * Interface that can be implemented by template loaders that maintain some 
 * sort of internal state (i.e. caches of earlier lookups for performance 
 * optimization purposes etc.) and support resetting of their state. 
 * @author Attila Szegedi
 * @version $Id: StatefulTemplateLoader.java,v 1.1.2.1 2007/04/03 18:06:07 szegedia Exp $
 */
public interface StatefulTemplateLoader extends TemplateLoader
{
    /**
     * Invoked by {@link Configuration#clearTemplateCache()} to instruct this
     * template loader to throw away its current state and start afresh. 
     */
    public void resetState();
}