28It must be pointed out, at the outset, that whereas it is for the national court to interpret the jurisdiction clause invoked before it in order to determine which disputes fall within its scope (judgment of 21 May 2015 in CDC Hydrogen Peroxide, C‑352/13, EU:C:2015:335, paragraph 67 and the case-law cited), the jurisdiction of a court or courts of a Member State, agreed by the contracting parties in such a clause, is, according to the terms of Article 23(1) of the Brussels I Regulation, in principle exclusive (see, to that effect, judgment of 21 May 2015 in El Majdoub, C‑322/14, EU:C:2015:334, paragraph 24).
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