Source for file Interface.class.php

<?php
/**
 * Cgiapp2 - Framework for building reusable web-applications
 *
 * A PHP5 port of perl's CGI::Application, a framework for building reusable web
 * applications.
 *
 * @package Cgiapp2
 * @author Matthew Weier O'Phinney <mweierophinney@gmail.com>; based on
 *  CGI::Application, by Jesse Erlbaum <jesse@erlbaum.net>, et. al.
 * @copyright (c) 2004 - present, Matthew Weier O'Phinney
 * @license BSD License (http://www.opensource.org/licenses/bsd-license.php)
 * @category Tools and Utilities
 * @tutorial Cgiapp2/Cgiapp2.cls
 * @version $Id:$
 */
 
/**
 * Cgiapp2_Error Observer Interface
 *
 * {@link Cgiapp2_Error} implements an Observer pattern. This interface
 * describes what an observer should implement.
 *
 * @package Cgiapp2
 * @author Matthew Weier O'Phinney <mweierophinney@gmail.com>
 * @copyright (c) 2006 - present Matthew Weier O'Phinney
 * @version @release-version@
 */
interface Cgiapp2_Error_Observer_Interface
{
    public static function event(Cgiapp2_Error $e);
}