31So far as concerns the contesting of certain facts by Airport Bolzano-Bozen AG, it should be remembered that Article 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 Case C-30/93 AC-ATEL Electronics Vertriebs v Hauptzollamt München-Mitte [1994] ECR I-2305, paragraph 16, and Case C-326/96 Levez v TH. Jennings (Harlow Pools) [1998] ECR I-7835, paragraph 25).
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