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JAXB (JSR 222) reference implementation - JAXB1 build

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/*
 * @(#)$Id: Grammar.java,v 1.4 2003/06/09 20:37:17 kk122374 Exp $
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */
package com.sun.msv.grammar;

/**
 * base interface of the "grammar".
 * 
 * This interface characterizes very basic part of grammar.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public interface Grammar extends java.io.Serializable {
    /**
     * gets top-level expression.
     * This expression shall be the constraint over the document element.
     * Never return null.
     */
    Expression getTopLevel();
    
    /**
     * gets ExpressionPool object which was used to construct this grammar.
     * Never return null.
     */
    ExpressionPool getPool();
}