Agreement in a lawsuit converting it into arbitration, with the appointment of a technical arbitrator by the judge, "to survey the areas of each party, measurements, boundaries and abutments, presenting a conclusive report that would be accepted by the litigants without any challenge." Application of the Brazilian Arbitration Act to the conduct of the technical arbitrator and to the "award," which was ratified by the court. Granting of the appeal to annul the ratification and the arbitral award due to the absence of a clear definition of the subject matter of the agreement to arbitrate: