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/*
 * 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.xpath;

import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * The XPathNamespace interface is returned by 
 * XPathResult interfaces to represent the XPath namespace node 
 * type that DOM lacks. There is no public constructor for this node type. 
 * Attempts to place it into a hierarchy or a NamedNodeMap result in a 
 * DOMException with the code HIERARCHY_REQUEST_ERR
 * . This node is read only, so methods or setting of attributes that would 
 * mutate the node result in a DOMException with the code 
 * NO_MODIFICATION_ALLOWED_ERR.
 * The core specification describes attributes of the Node 
 * interface that are different for different node types but does not 
 * describe XPATH_NAMESPACE_NODE, so here is a description of 
 * those attributes for this node type. All attributes of Node 
 * not described in this section have a null or 
 * false value.
 * 
ownerDocument matches the ownerDocument of the 
 * ownerElement even if the element is later adopted.
 * 
nodeName is always the string "#namespace".
 * 
prefix is the prefix of the namespace represented by the 
 * node.
 * 
localName is the same as prefix.
 * 
nodeType is equal to XPATH_NAMESPACE_NODE.
 * 
namespaceURI is the namespace URI of the namespace 
 * represented by the node.
 * 
nodeValue is the same as namespaceURI.
 * 
adoptNode, cloneNode, and 
 * importNode fail on this node type by raising a 
 * DOMException with the code NOT_SUPPORTED_ERR.
 * 
Note: In future versions of the XPath specification, the 
 * definition of a namespace node may be changed incomatibly, in which case 
 * incompatible changes to field values may be required to implement 
 * versions beyond XPath 1.0.
 * See also the Document Object Model (DOM) Level 3 XPath Specification.
 */
public interface XPathNamespace extends Node {
    // XPathNodeType
    /**
     * The node is a Namespace.
     */
    public static final short XPATH_NAMESPACE_NODE      = 13;

    /**
     * The Element on which the namespace was in scope when it 
     * was requested. This does not change on a returned namespace node even 
     * if the document changes such that the namespace goes out of scope on 
     * that element and this node is no longer found there by XPath.
     */
    public Element getOwnerElement();

}