31In the first place, it is apparent from Article 267 TFEU that, while it may be convenient, in certain circumstances, for the facts of the case to be established and for questions of purely national law to be settled at the time the reference is made to the Court (see judgments in Creamery Milk Suppliers Association and Others, 36/80 and 71/80, EU:C:1981:62, paragraph 6; Meilicke, C‑83/91, EU:C:1992:332, paragraph 26; and JämO, C‑236/98, EU:C:2000:173, paragraph 31), national courts have the widest discretion in referring matters to the Court if they consider that a case pending before them raises questions involving interpretation of provisions of EU law, or consideration of their validity, necessitating a decision on their part (see, inter alia, judgments in Mecanarte, C‑348/89, EU:C:1991:278, paragraph 44; Cartesio, C‑210/06, EU:C:2008:723, paragraph 88; Melki and Abdeli, C‑188/10 and C‑189/10, EU:C:2010:363, paragraph 41; and A, C‑112/13, EU:C:2014:2195, paragraph 35).
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