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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;

/**

 * 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/TR/2004/NOTE-DOM-Level-3-XPath-20040226'>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);

}