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) 2004 World Wide Web Consortium,
 *
 * (Massachusetts Institute of Technology, European Research Consortium for
 * Informatics and Mathematics, Keio University). All Rights Reserved. This
 * work is distributed under the W3C(r) Software License [1] 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.
 *
 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 */

package org.w3c.dom;


 DOMErrorHandler is a callback interface that the DOM 
implementation can call when reporting errors that happens while 
processing XML data, or when doing some other processing (e.g. validating 
a document). A DOMErrorHandler object can be attached to a 
Document using the "error-handler" on the 
DOMConfiguration interface. If more than one error needs to 
be reported during an operation, the sequence and numbers of the errors 
passed to the error handler are implementation dependent. 

 The application that is using the DOM implementation is expected to 
implement this interface. 

See also the Document Object Model (DOM) Level 3 Core Specification.

Since:DOM Level 3
/**
 *  <code>DOMErrorHandler</code> is a callback interface that the DOM 
 * implementation can call when reporting errors that happens while 
 * processing XML data, or when doing some other processing (e.g. validating 
 * a document). A <code>DOMErrorHandler</code> object can be attached to a 
 * <code>Document</code> using the "error-handler" on the 
 * <code>DOMConfiguration</code> interface. If more than one error needs to 
 * be reported during an operation, the sequence and numbers of the errors 
 * passed to the error handler are implementation dependent. 
 * <p> The application that is using the DOM implementation is expected to 
 * implement this interface. 
 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object Model (DOM) Level 3 Core Specification</a>.
 * @since DOM Level 3
 */
public interface DOMErrorHandler {
    
This method is called on the error handler when an error occurs.

 If an exception is thrown from this method, it is considered to be 
equivalent of returning true. 

Params:
  • error –  The error object that describes the error. This object 
  may be reused by the DOM implementation across multiple calls to 
  the handleError method.
Returns: If the handleError method returns 
  false, the DOM implementation should stop the current 
  processing when possible. If the method returns true, 
  the processing may continue depending on 
  DOMError.severity.
/**
     * This method is called on the error handler when an error occurs.
     * <br> If an exception is thrown from this method, it is considered to be 
     * equivalent of returning <code>true</code>. 
     * @param error  The error object that describes the error. This object 
     *   may be reused by the DOM implementation across multiple calls to 
     *   the <code>handleError</code> method. 
     * @return  If the <code>handleError</code> method returns 
     *   <code>false</code>, the DOM implementation should stop the current 
     *   processing when possible. If the method returns <code>true</code>, 
     *   the processing may continue depending on 
     *   <code>DOMError.severity</code>. 
     */
    public boolean handleError(DOMError error);

}