Revocation of a preliminary injunction that had stayed the proceedings of an arbitration proceeding on the grounds of the absence of an agreement to arbitrate. "Adopting the precedent of the Superior Court of Justice (STJ), to the effect that in the case of a 'full' clause the terms of reference [agreement to arbitrate] are dispensed with." Inadmissibility of interference by the judiciary. Jurisdiction of the arbitral tribunal to hear "questions concerning the legality of the arbitrators' own acts":