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Xerces2 provides high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces continues to build upon the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 provides fully conforming XML Schema 1.0 and 1.1 processors. An experimental implementation of the "XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010)" is also provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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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;

/**
 *  
 * DOM Level 3 WD Experimental:
 * The DOM Level 3 specification is at the stage 
 * of Working Draft, which represents work in 
 * progress and thus may be updated, replaced, 
 * or obsoleted by other documents at any time. 

* 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.Null / * empty prefix passed to XPathNSResolver should return default * namespace.Do not permit nullto be passed in invocation, * allowing the implementation, if shared, to do anything it wants with * a passed null.It would be confusing to specify more than * this since the resolution of namespaces for XPath expressions never * requires the default namespace.Null returns are problematic.No change. * They should be adequately addressed in core. Some implementations * have not properly supported them, but they will be fixed to be * compliant. Bindings are still free to choose alternative * representations of nullwhere required. * @param prefix The prefix to look for. * @return Returns the associated namespace URI or null if * none is found. */ public String lookupNamespaceURI(String prefix); }





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