/** tests the existence of all messages */
    public void testMessages() throws Exception {
        
        final REDocumentDeclaration decl = new REDocumentDeclaration(null,null);
        
        Checker checker = new Checker(){
            public void check( String propertyName ) {
                // if the specified property doesn't exist, this will throw an error
                System.out.println(
                    decl.localizeMessage(propertyName,new Object[]{"@@@","@@@","@@@","@@@","@@@"}));
            }