39That interpretation is corroborated by that of Article 4(3)(c) of the Aarhus Convention, which provides for an exception to the right of access to environmental information in relation to documents in the course of completion, and by the explanations contained in the document entitled The Aarhus Convention: An implementation guide (second edition, 2014) published by the United Nations Economic Commission for Europe, which, although it has no normative value, is one of the elements that may guide the interpretation of that convention (see, to that effect, judgment of 16 February 2012, Solvay and Others, C‑182/10, EU:C:2012:82, paragraph 27).