141In the first place, it must be determined whether the requested documents form part of the same category or are of the same nature. In that regard, it is sufficient to observe that it is common ground that those documents are all part of the same administrative file, namely the file in the ongoing procedure initiated pursuant to Article 29 of the framework directive, and that they therefore form part of the same category (see, to that effect, judgment of 16 July 2015, ClientEarth v Commission, C‑612/13 P, EU:C:2015:486, paragraphs 74 and 78).