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/*

 * Copyright (c) 2000 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.css;

/**

 *  The <code>CSSRuleList</code> interface provides the abstraction of an

 * ordered collection of CSS rules.

 * <p> The items in the <code>CSSRuleList</code> are accessible via an

 * integral index, starting from 0.

 * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113'>Document Object Model (DOM) Level 2 Style Specification</a>.

 * @since DOM Level 2

 */

public interface CSSRuleList {

    /**

     *  The number of <code>CSSRules</code> in the list. The range of valid

     * child rule indices is <code>0</code> to <code>length-1</code>

     * inclusive.

     */

    public int getLength();

    /**

     *  Used to retrieve a CSS rule by ordinal index. The order in this

     * collection represents the order of the rules in the CSS style sheet.

     * If index is greater than or equal to the number of rules in the list,

     * this returns <code>null</code>.

     * @param index Index into the collection

     * @return The style rule at the <code>index</code> position in the

     *   <code>CSSRuleList</code>, or <code>null</code> if that is not a

     *   valid index.

     */

    public CSSRule item(int index);

}