Case C-234/17: Judgment of the Court (Grand Chamber) of 24 October 2018 (request for a preliminary ruling from the Oberster Gerichtshof — Austria) — XC, YB, ZA (Reference for a preliminary ruling – Principles of EU law – Sincere cooperation – Procedural autonomy – Principles of equivalence and effectiveness – National legislation laying down a remedy allowing criminal proceedings to be reheard in the event of infringement of the European Convention for the Protection of Human Rights and Fundamental Freedoms – No obligation to extend that procedure to cases of alleged infringement of the fundamental rights enshrined in EU law)