Action to annul an arbitration award. Allegation that the dispute was decided by equity, in disregard of the arbitration agreement. Inadmissibility. Award based on interpretation of a contractual clause. Absence of adjudication by equity and legal infringement. Arbitral tribunal not "bound to the best interpretation of the wording of the contract, in accordance with the guidelines of the case law of domestic courts." Nullity of the arbitration award limited to the provisions of Article 32 of the Brazilian Arbitration Act: