The negotiation of the MLI was concluded in November, 2016, and it was open for signature afterwards. Thereafter, a first signing ceremony of the multilateral convention was announced for June 2017.
The government had indicated a desire to be among the first group of countries to sign this instrument. In preparing to sign, the department undertook an analysis of the provisions and of the relative benefits of the provisions and was aware that a provisional indication had to be listed in June 2017, but that it could be updated at a later date.
The government took a very prudent approach on signature and picked up all the minimum standards in the convention, in addition to binding arbitration, with the view that it would continue to study the other detailed provisions of the MLI and how they interacted with the large treaty network with a view to updating its position prior to ratification.
Following that review the government took the decision to adopt additional optional provisions that will be proposed to be adopted on ratification of the treaty. They were announced by the government in the press release that came out, I believe, the day the notice of ways and means motion was tabled in the House.