50From that viewpoint, it should be borne in mind that the principle of fiscal neutrality – a particular expression of the principle of equal treatment at the level of secondary EU law and in the specific area of taxation (see, to that effect, NCC Construction Danmark, paragraph 44) – is not a rule of primary law against which it is possible to test the validity of an exemption provided for under Article 13 of the Sixth Directive. Nor does that principle make it possible for the scope of such an exemption to be extended in the absence of an unequivocal provision to that effect (see, to that effect, VDP Dental Laboratory, paragraphs 35 to 37, and Deutsche Bank, paragraph 45).
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