25It should be borne in mind that, in proceedings under Article 177 of the Treaty, which is based on a clear separation of functions between the national courts and the Court of Justice, any assessment of the facts in the case is a matter for the national court (see Case 104/77 Oehlschläger v Hauptzollamt Emmerich [1978] ECR 791, paragraph 4; Case 36/79 Denkavit Futtermittel v Finanzamt Warendorf [1979] ECR 3439, paragraph 12). The Court of Justice is thus empowered to rule on the interpretation or validity of Community provisions only on the basis of the facts which the national court puts before it (see Case C-30/93 AC-ATEL Electronics Vertriebs ν Hauptzollamt München-Mitte [1994] ECR I-2305, paragraph 16; Case C-352/95 Phytheron International w Jean Bourdon [1997] ECR I-1729, paragraph 11).
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