There's also ISO/IEC 21320-1 (https://www.iso.org/standard/60101.html https://www.iso.org/standard/60101.html, available as a free download at https://standards

There's also ISO/IEC 21320-1 (https://www.iso.org/standard/60101.html https://www.iso.org/standard/60101.html, available as a free download at https://standards.iso.org/ittf/PubliclyAvailableStandards/index.html https://standards.iso.org/ittf/PubliclyAvailableStandards/in...), which subsets APPNOTE.TXT by forbidding several less common features of the file format (like multiple volumes, encryption, or compression methods other than DEFLATE). Unfortunately, as far as I can see even that standard doesn't forbid self-extracting archives, non-empty zip file comments, or local file headers which don't match the central directory. It would be great if that standard were updated to also forbid these problematic features of the ZIP format, so that archive files created following that standard could be parsed without ambiguity. Then it would be a matter of updating other ZIP-using standards like OpenDocument to reference this simplified standard.