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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 <code>XPathNamespace</code> interface is returned by
 * <code>XPathResult</code> 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
 * <code>DOMException</code> with the code <code>HIERARCHY_REQUEST_ERR</code>
 * . This node is read only, so methods or setting of attributes that would
 * mutate the node result in a DOMException with the code
 * <code>NO_MODIFICATION_ALLOWED_ERR</code>.
 * <p>The core specification describes attributes of the <code>Node</code>
 * interface that are different for different node types but does not
 * describe <code>XPATH_NAMESPACE_NODE</code>, so here is a description of
 * those attributes for this node type. All attributes of <code>Node</code>
 * not described in this section have a <code>null</code> or
 * <code>false</code> value.
 * <p><code>ownerDocument</code> matches the <code>ownerDocument</code> of the
 * <code>ownerElement</code> even if the element is later adopted.
 * <p><code>nodeName</code> is always the string "<code>#namespace</code>".
 * <p><code>prefix</code> is the prefix of the namespace represented by the
 * node.
 * <p><code>localName</code> is the same as <code>prefix</code>.
 * <p><code>nodeType</code> is equal to <code>XPATH_NAMESPACE_NODE</code>.
 * <p><code>namespaceURI</code> is the namespace URI of the namespace
 * represented by the node.
 * <p><code>nodeValue</code> is the same as <code>namespaceURI</code>.
 * <p><code>adoptNode</code>, <code>cloneNode</code>, and
 * <code>importNode</code> fail on this node type by raising a
 * <code>DOMException</code> with the code <code>NOT_SUPPORTED_ERR</code>.
 * <p ><b>Note:</b> 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.
 * <p>See also the <a href='http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226'>Document Object Model (DOM) Level 3 XPath Specification</a>.
 */
public interface XPathNamespace extends Node {
    // XPathNodeType
    /**
     * The node is a <code>Namespace</code>.
     */
    public static final short XPATH_NAMESPACE_NODE      = 13;
 
    /**
     * The <code>Element</code> 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();
 
}