http://xml.apache.org/commons/components/external/: xml-commons provides an Apache-hosted set of DOM, SAX, and JAXP interfaces for use in other xml-based projects. Our hope is that we can standardize on both a common version and packaging scheme for these critical XML standards interfaces to make the lives of both our developers and users easier. The External Components portion of xml-commons contains interfaces that are defined by external standards organizations. For DOM, that's the W3C; for SAX it's David Megginson and sax.sourceforge.net; for JAXP it's Sun. 
/*
 * Copyright (c) 2000 World Wide Web Consortium,
 * (Massachusetts Institute of Technology, Institut National de
 * Recherche en Informatique et en Automatique, Keio University). All
 * Rights Reserved. This program is distributed under the W3C's Software
 * Intellectual Property License. This program is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.
 * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
 */

package org.w3c.dom.events;


 Event operations may throw an EventException as specified in 
their method descriptions. 

See also the Document Object Model (DOM) Level 2 Events Specification.

Since:DOM Level 2
/**
 *  Event operations may throw an <code>EventException</code> as specified in 
 * their method descriptions. 
 * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113'>Document Object Model (DOM) Level 2 Events Specification</a>.
 * @since DOM Level 2
 */
public class EventException extends RuntimeException {
    public EventException(short code, String message) {
       super(message);
       this.code = code;
    }
    public short   code;
    // EventExceptionCode
    
 If the Event's type was not specified by initializing the 
event before the method was called. Specification of the Event's type 
as null or an empty string will also trigger this 
exception. 

/**
     *  If the <code>Event</code>'s type was not specified by initializing the 
     * event before the method was called. Specification of the Event's type 
     * as <code>null</code> or an empty string will also trigger this 
     * exception. 
     */
    public static final short UNSPECIFIED_EVENT_TYPE_ERR = 0;

}