36Secondly, it is settled case-law that, in proceedings under Article 267 TFEU, 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 by the national court concern the interpretation of Union law, the Court of Justice is, in principle, bound to give a ruling (see, in particular, Case C-379/98 PreussenElektra [2001] ECR I-2099, paragraph 38, and Case C-169/07 Hartlauer [2009] ECR I-1721, paragraph 24).
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