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/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/NamespaceContext.java,v 1.10 2006/07/03 11:58:06 elharo Exp $
 * $Revision: 1.10 $
 * $Date: 2006/07/03 11:58:06 $
 *
 * ====================================================================
 *
 * Copyright 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 
 *   * Neither the name of the Jaxen Project nor the names of its
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id: NamespaceContext.java,v 1.10 2006/07/03 11:58:06 elharo Exp $
 */


package org.navimatrix.jaxen;

/** Resolves namespace prefixes to namespace URIs.
 *
 *  

* The prefixes used within an XPath expression are * independent of those used within any target document. * When evaluating an XPath against a document, only * the resolved namespace URIs are compared, not their * prefixes. *

* *

* A NamespaceContext is responsible for * translating prefixes as they appear in XPath expressions * into URIs for comparison. A document's prefixes are * resolved internal to the document based upon its own * namespace nodes. *

* *

* Implementations of this interface should implement Serializable. *

* * @see BaseXPath * @see Navigator#getElementNamespaceUri * @see Navigator#getAttributeNamespaceUri * * @author bob mcwhirter */ public interface NamespaceContext { /** Translate the provided namespace prefix into * the matching bound namespace URI. * *

* In XPath, there is no such thing as a 'default namespace'. * The empty prefix always resolves to the empty * namespace URI. This method should return null for the * empty prefix. * Similarly, the prefix "xml" always resolves to * the URI "http://www.w3.org/XML/1998/namespace". *

* * @param prefix the namespace prefix to resolve * * @return the namespace URI bound to the prefix; or null if there * is no such namespace */ String translateNamespacePrefixToUri(String prefix); }




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