Writ of mandamus invoking compliance with an arbitration award for the maintenance of a permit to use municipal space for street vending. Petitioner who failed to prove the existence of an arbitration agreement or the municipality's participation in the arbitration proceedings. Arbitration proceedings in which, moreover, the lawyer representing the petitioner would appear as arbitrator, in violation of Article 14 of the Brazilian Arbitration Act. Municipal permit that depends on the mere discretion of the public authority: