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;


This interface represents a notation declared in the DTD. A notation either 
declares, by name, the format of an unparsed entity (see section 4.7 of the XML 1.0 specification [XML 1.0]), or is 
used for formal declaration of processing instruction targets (see section 2.6 of the XML 1.0 specification [XML 1.0]). The 
nodeName attribute inherited from Node is set 
to the declared name of the notation.

The DOM Core does not support editing Notation nodes; they 
are therefore readonly.

A Notation node does not have any parent.

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

/**
 * This interface represents a notation declared in the DTD. A notation either 
 * declares, by name, the format of an unparsed entity (see <a href='http://www.w3.org/TR/2004/REC-xml-20040204#Notations'>section 4.7</a> of the XML 1.0 specification [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>]), or is 
 * used for formal declaration of processing instruction targets (see <a href='http://www.w3.org/TR/2004/REC-xml-20040204#sec-pi'>section 2.6</a> of the XML 1.0 specification [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>]). The 
 * <code>nodeName</code> attribute inherited from <code>Node</code> is set 
 * to the declared name of the notation.
 * <p>The DOM Core does not support editing <code>Notation</code> nodes; they 
 * are therefore readonly.
 * <p>A <code>Notation</code> node does not have any parent.
 * <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 Notation extends Node {
    
The public identifier of this notation. If the public identifier was 
not specified, this is null.

/**
     * The public identifier of this notation. If the public identifier was 
     * not specified, this is <code>null</code>.
     */
    public String getPublicId();

    
The system identifier of this notation. If the system identifier was 
not specified, this is null. This may be an absolute URI 
or not.

/**
     * The system identifier of this notation. If the system identifier was 
     * not specified, this is <code>null</code>. This may be an absolute URI 
     * or not.
     */
    public String getSystemId();

}