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  /*
   * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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  /*
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   * Copyright (c) 2002 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.xpath;
  
  
  /**
   * The <code>XPathNSResolver</code> interface permit <code>prefix</code>
   * strings in the expression to be properly bound to
   * <code>namespaceURI</code> strings. <code>XPathEvaluator</code> can
   * construct an implementation of <code>XPathNSResolver</code> from a node,
   * or the interface may be implemented by any application.
   * <p>See also the <a href='http://www.w3.org/2002/08/WD-DOM-Level-3-XPath-20020820'>Document Object Model (DOM) Level 3 XPath Specification</a>.
   */
  public interface XPathNSResolver {
      /**
       * Look up the namespace URI associated to the given namespace prefix. The
       * XPath evaluator must never call this with a <code>null</code> or
       * empty argument, because the result of doing this is undefined.
       * @param prefix The prefix to look for.
       * @return Returns the associated namespace URI or <code>null</code> if
       *   none is found.
       */
      public String lookupNamespaceURI(String prefix);
  
  }