"1. If the parties, one or more of whom is domiciled in a Member State, have agreed that a court or the courts of a Member State are to have jurisdiction to settle any disputes which have arisen or which may arise in connection with a particular legal relationship, that court or those courts shall have jurisdiction. Such jurisdiction shall be exclusive unless the parties have agreed otherwise. Such an agreement conferring jurisdiction shall be either: (a) in writing or evidenced in writing; or ... (c) in international trade or commerce, in a form which accords with a usage of which the parties are or ought to have been aware and which in such trade or commerce is widely known to, and regularly observed by, parties to contracts of the type involved in the particular trade or commerce concerned."
"Jurisdiction clause. The commercial court of Nantes shall have exclusive jurisdiction regarding all disputes relating to our sales. By accepting our deliveries you are required to comply with this condition."
"The test to be applied requires the party who alleges that there be an applicable agreement on jurisdiction to have the better of the argument on the materials before the court at the time of the challenge." 6. "
"As to the requirements as to formality, these requirements are to be construed strictly because their purpose is to ensure that parties have indeed consented to a clause derogating from the ordinary jurisdictional role -see The Conflict of Laws, paras 12-112-111 to 12-115 and Civil Jurisdiction and Judgments, paras 2.92 to 2.95."