28That conclusion cannot be invalidated by the fact that the children involved in the main proceedings also have the nationality of the Member State in which they have been resident since their birth and which, according to the authorities of that State, is by virtue of that fact the only nationality recognised by the latter. It is not permissible for a Member State to restrict the effects of the grant of the nationality of another Member State by imposing an additional condition for recognition of that nationality with a view to the exercise of the fundamental freedoms provided for in the Treaty (see in particular, to that effect, Case C-369/90 Micheletti and Others [1992] ECR I-4239, paragraph 10). Furthermore, Article 3 of the Hague Convention, on which the Kingdom of Belgium relies in recognising only the nationality of the forum where there are several nationalities, one of which is Belgian, does not impose an obligation but simply provides an option for the contracting parties to give priority to that nationality over any other.
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