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) 1998 World Wide Web Consortium, (Massachusetts Institute of
 * Technology, Institut National de Recherche en Informatique et en
 * Automatique, Keio University).
 * All Rights Reserved. http://www.w3.org/Consortium/Legal/
 */

package org.w3c.dom.html;

import org.w3c.dom.*;


Group options together in logical subdivisions. See the OPTGROUP element 
definition in HTML 4.0.

/**
 * Group options together in logical subdivisions. See the OPTGROUP element 
 * definition in HTML 4.0.
 */
public interface HTMLOptGroupElement extends HTMLElement {
  
The control is unavailable in this context. See the disabled attribute 
definition in HTML 4.0.

/**
   * The control is unavailable in this context. See the disabled attribute 
   * definition in HTML 4.0.
   */
  public boolean            getDisabled();
  public void               setDisabled(boolean disabled);
  
Assigns a label to this option group. See the label attribute definition 
in HTML 4.0.

/**
   * Assigns a label to this option group. See the label attribute definition 
   * in HTML 4.0.
   */
  public String             getLabel();
  public void               setLabel(String label);
}