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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 <code>DOMImplementationList</code> interface provides the abstraction

 * of an ordered collection of DOM implementations, without defining or

 * constraining how this collection is implemented. The items in the

 * <code>DOMImplementationList</code> are accessible via an integral index,

 * starting from 0.

 * <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>.

 * @since DOM Level 3

 */

public interface DOMImplementationList {

    /**

     *  Returns the <code>index</code>th item in the collection. If

     * <code>index</code> is greater than or equal to the number of

     * <code>DOMImplementation</code>s in the list, this returns

     * <code>null</code>.

     * @param index Index into the collection.

     * @return  The <code>DOMImplementation</code> at the <code>index</code>

     *   th position in the <code>DOMImplementationList</code>, or

     *   <code>null</code> if that is not a valid index.

     */

    public DOMImplementation item(int index);

    /**

     *  The number of <code>DOMImplementation</code>s in the list. The range

     * of valid child node indices is 0 to <code>length-1</code> inclusive.

     */

    public int getLength();

}