Opinion 1/17: Opinion of the Court (Full Court) of 30 April 2019 — Kingdom of Belgium (Opinion pursuant to Article 218(11) TFEU — Comprehensive Economic and Trade Agreement between Canada, of the one part, and the European Union and its Member States, of the other part (CETA) — Investor-State Dispute Settlement (ISDS) — Establishment of a Tribunal and an Appellate Tribunal — Compatibility with primary EU law — Requirement to respect the autonomy of the EU legal order — Level of protection of public interests determined, in accordance with the EU constitutional framework, by the EU institutions — Equal treatment of Canadian investors and EU investors — Charter of Fundamental Rights of the European Union — Article 20 — Access to the above Tribunals and their independence — Article 47 of the Charter — Financial accessibility — Commitment to guarantee that accessibility for natural persons and small and medium-sized enterprises — External and internal aspects of the requirement of independence — Appointment, remuneration and ethics of the Members — Role of the CETA Joint Committee — Binding interpretations of the CETA determined by that Committee)