33Article 177 of the Treaty is based on a clear separation of functions between the national courts and the Court of Justice, so that, when ruling on the interpretation or validity of Community provisions, the latter is empowered to do so only on the basis of the facts which the national court puts before it (see, inter alia, Case C-30/93 ACATE L Electronics Vertriebs [1994] ECR I-2305, paragraph 16, and Case C-326/96 Levez [1998] ECR I-7835, paragraph 26).
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