001    /*
002     * Copyright (c) 2004 World Wide Web Consortium,
003     *
004     * (Massachusetts Institute of Technology, European Research Consortium for
005     * Informatics and Mathematics, Keio University). All Rights Reserved. This
006     * work is distributed under the W3C(r) Software License [1] in the hope that
007     * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
008     * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
009     *
010     * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
011     */
012    
013    package org.w3c.dom;
014    
015    /**
016     *  The <code>DOMImplementationList</code> interface provides the abstraction 
017     * of an ordered collection of DOM implementations, without defining or 
018     * constraining how this collection is implemented. The items in the 
019     * <code>DOMImplementationList</code> are accessible via an integral index, 
020     * starting from 0. 
021     * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object Model (DOM) Level 3 Core Specification</a>.
022     * @since DOM Level 3
023     */
024    public interface DOMImplementationList {
025        /**
026         *  Returns the <code>index</code>th item in the collection. If 
027         * <code>index</code> is greater than or equal to the number of 
028         * <code>DOMImplementation</code>s in the list, this returns 
029         * <code>null</code>. 
030         * @param index Index into the collection.
031         * @return  The <code>DOMImplementation</code> at the <code>index</code>
032         *   th position in the <code>DOMImplementationList</code>, or 
033         *   <code>null</code> if that is not a valid index. 
034         */
035        public DOMImplementation item(int index);
036    
037        /**
038         *  The number of <code>DOMImplementation</code>s in the list. The range 
039         * of valid child node indices is 0 to <code>length-1</code> inclusive. 
040         */
041        public int getLength();
042    
043    }