* represent a class file this method returns {@code null}.
     *
     * @return the nesting kind, or {@code null} if the nesting kind
     * is not known
     */
    NestingKind getNestingKind();

    /**
     * Provides a hint about the access level of the class represented
     * by this file object.  If the access level is not known or if
     * this file object does not represent a class file this method
     * returns {@code null}.
     *
     * @return the access level
     */
    Modifier getAccessLevel();

}