8It is apparent from the documents before the Court that although the question submitted expressly relates only to the interpretation of Article 15 of the contested regulation, the national court is in fact uncertain of the validity of that provision in the light, in particular, of Article 86 of the Treaty. It should be noted, moreover, that the wording of Article 15 leaves no room for doubt that it prohibits traders from marking the eggs marketed by them with the date on which they were laid; nor has that interpretation been challenged either in the written observations or at the hearing. It must therefore be concluded that the question referred to the Court relates in substance to the validity of Article 15.