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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.

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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 XPathNSResolver interface permit prefix 
 * strings in the expression to be properly bound to 
 * namespaceURI strings. XPathEvaluator can 
 * construct an implementation of XPathNSResolver from a node, 
 * or the interface may be implemented by any application.
 * See also the Document Object Model (DOM) Level 3 XPath Specification.
 */
public interface XPathNSResolver {
    /**
     * Look up the namespace URI associated to the given namespace prefix. The 
     * XPath evaluator must never call this with a null 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 null if 
     *   none is found.
     */
    public String lookupNamespaceURI(String prefix);

}