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Backend for the W3C CSS Validation Service

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//
// $Id$
// From Philippe Le Hegaret ([email protected])
//
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html
/*
 * AtRule.java
 * $Id$
 */
package org.w3c.css.parser;

/**
 * @author Philippe Le Hegaret
 * @version $Revision$
 */
public abstract class AtRule {

    /**
     * Returns the at rule keyword
     */
    public abstract String keyword();

    /**
     * The second must be exactly the same of this one
     */
    public abstract boolean canApply(AtRule atRule);

    /**
     * The second must only match this one
     */
    public abstract boolean canMatch(AtRule atRule);

    public abstract boolean isEmpty();

    public String lookupPrefix() {
        return keyword();
    }
}