Ummm... OpenDocument, which is an ISO standard?
https://www.oasis-open.org/tc-opendocument/
Standard doesn't mean good. Win32 is a better API than POSIX. MSOffice used to work much better than LibreOffice. Linux is better than UNIX.
alt Hacker News
Standard doesn't mean good. Win32 is a better API than POSIX. MSOffice used to work much better than LibreOffice. Linux is better than UNIX.