Any clause contained in the contract and all special agreements entered into before the damage occurred by which the parities purport to infringe the rules laid down by this Convention, whether by decoding the law to be applied, or by altering the rules as to jurisdiction, shall be null and void. Nevertheless or (the carriage of cargo arbitration Clauses are allowed, subject Ito this Convention, if the arbitration is to take place within one of She jurisdictions referred to in the first paragraph of Article 28.