52Having subsequently been asked about the relationship between Article 21 of the Brussels Convention and Article 17 thereof, relating to exclusive jurisdiction pursuant to a jurisdiction clause, which corresponds to Article 23 of Regulation No 44/2001, it is true that the Court held in Gasser that the fact that the jurisdiction of the court other than the court first seised is assessed under Article 17 of that Convention cannot call in question the application of the procedural rule contained in Article 21 of the Convention, which is based clearly and solely on the chronological order in which the courts involved are seised.
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