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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces 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 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are 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) 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;

/**
 *  The DOMImplementationList interface provides the abstraction 
 * of an ordered collection of DOM implementations, without defining or 
 * constraining how this collection is implemented. The items in the 
 * DOMImplementationList are accessible via an integral index, 
 * starting from 0. 
 * See also the Document Object Model (DOM) Level 3 Core Specification.
 * @since DOM Level 3
 */
public interface DOMImplementationList {
    /**
     *  Returns the indexth item in the collection. If 
     * index is greater than or equal to the number of 
     * DOMImplementations in the list, this returns 
     * null. 
     * @param index Index into the collection.
     * @return  The DOMImplementation at the index
     *   th position in the DOMImplementationList, or 
     *   null if that is not a valid index. 
     */
    public DOMImplementation item(int index);

    /**
     *  The number of DOMImplementations in the list. The range 
     * of valid child node indices is 0 to length-1 inclusive. 
     */
    public int getLength();

}