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.css;

import org.w3c.dom.DOMException;


 The CSSCharsetRule interface represents a @charset rule in a 
CSS style sheet. The value of the encoding attribute does 
not affect the encoding of text data in the DOM objects; this encoding is 
always UTF-16. After a stylesheet is loaded, the value of the 
encoding attribute is the value found in the 
@charset rule. If there was no @charset in the 
original document, then no CSSCharsetRule is created. The 
value of the encoding attribute may also be used as a hint 
for the encoding used on serialization of the style sheet. 

 The value of the @charset rule (and therefore of the 
CSSCharsetRule) may not correspond to the encoding the 
document actually came in; character encoding information e.g. in an HTTP 
header, has priority (see CSS document representation) but this is not 
reflected in the CSSCharsetRule. 

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

Since:DOM Level 2
/**
 *  The <code>CSSCharsetRule</code> interface represents a @charset rule in a 
 * CSS style sheet. The value of the <code>encoding</code> attribute does 
 * not affect the encoding of text data in the DOM objects; this encoding is 
 * always UTF-16. After a stylesheet is loaded, the value of the 
 * <code>encoding</code> attribute is the value found in the 
 * <code>@charset</code> rule. If there was no <code>@charset</code> in the 
 * original document, then no <code>CSSCharsetRule</code> is created. The 
 * value of the <code>encoding</code> attribute may also be used as a hint 
 * for the encoding used on serialization of the style sheet. 
 * <p> The value of the @charset rule (and therefore of the 
 * <code>CSSCharsetRule</code>) may not correspond to the encoding the 
 * document actually came in; character encoding information e.g. in an HTTP 
 * header, has priority (see CSS document representation) but this is not 
 * reflected in the <code>CSSCharsetRule</code>. 
 * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113'>Document Object Model (DOM) Level 2 Style Specification</a>.
 * @since DOM Level 2
 */
public interface CSSCharsetRule extends CSSRule {
    
 The encoding information used in this @charset rule. 

/**
     *  The encoding information used in this <code>@charset</code> rule. 
     */
    public String getEncoding();
    
 The encoding information used in this @charset rule. 

Throws:
  • DOMException – 
  SYNTAX_ERR: Raised if the specified encoding value has a syntax error 
  and is unparsable.
  
    NO_MODIFICATION_ALLOWED_ERR: Raised if this encoding rule is 
  readonly.
/**
     *  The encoding information used in this <code>@charset</code> rule. 
     * @exception DOMException
     *   SYNTAX_ERR: Raised if the specified encoding value has a syntax error 
     *   and is unparsable.
     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this encoding rule is 
     *   readonly.
     */
    public void setEncoding(String encoding)
                           throws DOMException;

}