* @return {@link FieldDesc}
     */
    FieldDesc getFieldDesc(String fieldName);

    /**
     * Returns the {@link FieldDesc}.
     *
     * @param index
     *            The index of the {@link FieldDesc}
     * @return {@link FieldDesc}
     */
    FieldDesc getFieldDesc(int index);

    /**
     * Returns the number of {@link FieldDesc}.
     *