Artikel 27

A Contracting State which has two or more territorial units in which different systems of law apply in relation to marriage may, at the time of signature, ratification, acceptance, approval or accession, declare that the Convention shall apply to all its territorial units or only to one or more of them, and may extend its declaration at any time thereafter.
These declarations shall be notified to the Ministry of Foreign Affairs of the Kingdom of the Netherlands, and shall state expressly the territorial unit to which the Convention applies.