/*
* @(#)$Id: Grammar.java,v 1.3 2001/05/29 23:03:30 Bear 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 <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
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();
}