59It is settled case-law that the power, as resulting from that provision, to provide interpretations by way of preliminary rulings extends only to rules which are part of European Union law (see to this effect, inter alia, Case C-130/95 Giloy [1997] ECR I-4291, paragraph 21; Case C-222/04 Cassa di Risparmio di Firenze and Others [2006] ECR I-289, paragraph 63; and Case C-453/04 innoventif [2006] ECR I-4929, paragraph 29).
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