An agreement conferring jurisdiction is not to be regarded as having been concluded for the benefit of only one of the parties, within the meaning of the third paragraph of Article 17 of the Convention of 27 September 1968 on Jurisdiction and the Enforcement of Judgments in Civil and Commercial Matters, where all that is established is that the parties have agreed that a court or the courts of the Contracting State in which that party is domiciled are to have jurisdiction.