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.*;


All HTML element interfaces derive from this class. Elements that only 
exposethe HTML core attributes are represented by the base
HTMLElement interface. These elements are as follows:HEAD
special: SUB, SUP, SPAN, BDOfont: TT, I, B, U, S, STRIKE, BIG, SMALL
phrase: EM, STRONG, DFN, CODE, SAMP, KBD, VAR, CITE, ACRONYM, ABBRlist: 
DD, DTNOFRAMES, NOSCRIPTADDRESS, CENTER
Note. The style attribute for thisinterface is reserved for 
future usage. 

/**
 * All HTML element interfaces derive from this class. Elements that only 
 * exposethe HTML core attributes are represented by the base
 * <code>HTMLElement</code> interface. These elements are as follows:HEAD
 * special: SUB, SUP, SPAN, BDOfont: TT, I, B, U, S, STRIKE, BIG, SMALL
 * phrase: EM, STRONG, DFN, CODE, SAMP, KBD, VAR, CITE, ACRONYM, ABBRlist: 
 * DD, DTNOFRAMES, NOSCRIPTADDRESS, CENTER
 * Note. The <code>style</code> attribute for thisinterface is reserved for 
 * future usage. 
 */
public interface HTMLElement extends Element {
  
The element's identifier. See the id attribute definition in HTML 4.0.

/**
   * The element's identifier. See the id attribute definition in HTML 4.0.
   */
  public String             getId();
  public void               setId(String id);
  
The element's advisory title. See the title attribute definition in HTML 
4.0.

/**
   * The element's advisory title. See the title attribute definition in HTML 
   * 4.0.
   */
  public String             getTitle();
  public void               setTitle(String title);
  
Language code defined in RFC 1766. See the lang attribute definition in 
HTML 4.0.

/**
   * Language code defined in RFC 1766. See the lang attribute definition in 
   * HTML 4.0.
   */
  public String             getLang();
  public void               setLang(String lang);
  
Specifies the base direction of directionally neutraltext and the 
directionality of tables. See the dir attribute definition in HTML 4.0.

/**
   * Specifies the base direction of directionally neutraltext and the 
   * directionality of tables. See the dir attribute definition in HTML 4.0.
   */
  public String             getDir();
  public void               setDir(String dir);
  
The class attribute of the element. This attribute has been renameddue to 
conflicts with the "class" keyword exposed by many languages. See the 
class attribute definition in HTML 4.0.

/**
   * The class attribute of the element. This attribute has been renameddue to 
   * conflicts with the "class" keyword exposed by many languages. See the 
   * class attribute definition in HTML 4.0.
   */
  public String             getClassName();
  public void               setClassName(String className);
}