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;


The ProcessingInstruction interface represents a "processing 
instruction", used in XML as a way to keep processor-specific information 
in the text of the document.

 No lexical check is done on the content of a processing instruction and 
it is therefore possible to have the character sequence 
"?>" in the content, which is illegal a processing 
instruction per section 2.6 of [XML 1.0]. The 
presence of this character sequence must generate a fatal error during 
serialization. 

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

/**
 * The <code>ProcessingInstruction</code> interface represents a "processing 
 * instruction", used in XML as a way to keep processor-specific information 
 * in the text of the document.
 * <p> No lexical check is done on the content of a processing instruction and 
 * it is therefore possible to have the character sequence 
 * <code>"?&gt;"</code> in the content, which is illegal a processing 
 * instruction per section 2.6 of [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>]. The 
 * presence of this character sequence must generate a fatal error during 
 * serialization. 
 * <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>.
 */
public interface ProcessingInstruction extends Node {
    
The target of this processing instruction. XML defines this as being 
the first token following the markup that begins the processing 
instruction.

/**
     * The target of this processing instruction. XML defines this as being 
     * the first token following the markup that begins the processing 
     * instruction.
     */
    public String getTarget();

    
The content of this processing instruction. This is from the first non 
white space character after the target to the character immediately 
preceding the ?>.

/**
     * The content of this processing instruction. This is from the first non 
     * white space character after the target to the character immediately 
     * preceding the <code>?&gt;</code>.
     */
    public String getData();
    
The content of this processing instruction. This is from the first non 
white space character after the target to the character immediately 
preceding the ?>.

Throws:
  • DOMException – 
  NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
/**
     * The content of this processing instruction. This is from the first non 
     * white space character after the target to the character immediately 
     * preceding the <code>?&gt;</code>.
     * @exception DOMException
     *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
     */
    public void setData(String data)
                                   throws DOMException;

}