Real property purchase and sale promise contract with an arbitration clause. Filing, by the seller and by the buyer, of lawsuits for rescission of the contract with a claim for damages and, again by the buyer, of an action to enforce the same contract. First-instance judgment dismissing all lawsuits on the basis of the arbitration clause. Granting of the parties' appeals for the continuation of the lawsuits before the judiciary. Arbitration clause that is the product of party autonomy and may be set aside by the contracting parties: