15The Court has further held with regard to the initial version of Article 17 that, by making the validity of a jurisdiction clause subject to the existence of an ‘agreement’ between the parties, Article 17 imposes on the court before which the matter is brought the duty of examining, first, whether the clause conferring jurisdiction upon it was in fact the subject of consensus between the parties, which must be clearly and precisely demonstrated, and that the purpose of the requirements as to form imposed by Article 17 is to ensure that consensus between the parties is in fact established (Estasis Salotti, paragraph 7, and Segoura, paragraph 6).