28In that regard, it should be borne in mind that, according to settled case-law of the Court, questions on the interpretation of EU law referred by a national court in the factual and legislative context which that court is responsible for defining and the accuracy of which is not a matter for the Court to determine enjoy a presumption of relevance. The Court may refuse to rule on a question referred for a preliminary ruling from a national court only where it is quite obvious that the interpretation of EU law that is sought bears no relation to the actual facts of the main action or its purpose, where the problem is hypothetical, or where the Court does not have before it the factual or legal material necessary to give a useful answer to the questions submitted to it, which requires the national court to define the factual and legal context of the questions it is asking or, at the very least, to explain the factual circumstances on which those questions are based (judgments of 21 September 2016, Etablissements Fr. Colruyt, C‑221/15, EU:C:2016:704, paragraph 14, and of 31 May 2018, Zheng, C‑190/17, EU:C:2018:357, paragraph 48 and the case-law cited).
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