* @exception  IOException
     *     Thrown if a error ocurred reading the document.
     */
    public Doc getDoc() throws IOException;

    /**
     * Go to the multidoc object that contains the next doc object in the
     * sequence of doc objects.
     *
     * @return  Multidoc object containing the next doc object, or null if
     * there are no further doc objects.
     *
     * @exception  IOException
     *     Thrown if an error occurred locating the next document
     */
    public MultiDoc next() throws IOException;

}