43In this regard, it must be recalled that, in proceedings under Article 234 EC, which are 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 Similarly, it is solely for the national court before which the dispute has been brought, and which must assume responsibility for the subsequent judicial decision, to determine in the light of the particular circumstances of the case both the need for a preliminary ruling in order to enable it to deliver judgment and the relevance of the questions which it submits to the Court. Consequently, where the questions submitted concern the interpretation of Community law, the Court is in principle bound to give a ruling (see, inter alia, Case C-326/00 IKA [2003] ECR I-1703, paragraph 27; Case C-145/03 Keller [2005] ECR I-2529, paragraph 33; and Case C-419/04 Conseil général de la Vienne [2006] ECR I-5645, paragraph 19).
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