(1) Every convention application shall--
         (a) be accompanied by a complete specification; and
         (b) specify the date on which and the convention country in which the application for protection, or as the case may be, the first of such applications was made; and
         (c) state that no application for protection in respect of the invention had been made in a convention country before that date by the applicant or by any person from whom he derives title.
     (2) Subject to the provisions contained in section 10, a complete specification filed with a convention application may include claims in respect of developments of, or additions to, the invention in respect of which the application for protection was made in a convention country, being developments or additions in respect of which the applicant would be entitled under the provisions of section 6 to make a separate application for a patent.
     (3) A convention application shall not be post-dated under sub-section (1) of section 17 to a date later than the date on which under the provisions of this Act the application could have been made.