While it might have be issued in 1985, the Austrian Staatsbürgerschaftsgesetz has been amended on many occasions.
The Staatsbürgerschaftsgesetz 1985 related to the fact that the recasting of the Austrian Citizenship Act took place in 1985. It has been amended on many occasions since then, with Articles and paras. than no longer apply being repealed or amended accordingly. Similarly the same has happened to the British Nationality Act of 1981.