35It should be noted, first, that it is not the function of the Court of Justice to rule on the interpretation of national provisions, that being within the exclusive jurisdiction of the national courts. In addition, when hearing a reference for a preliminary ruling from a national court, the Court of Justice must base its reasoning on the interpretation of national law as described to it by that court (Case C-115/08 ČEZ [2009] ECR I-10265, paragraph 57 and case-law cited).
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