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Тот же gnumeric пишет поддержку и как ни странно хвалит, а не ругает формат, говорит, что проще им его поддержать чем odf (а для них оба формата не родные, так что их опыт тут вполне интересен).
How hard was it to implement ODF support compared to OOX ?
it was significantly more difficult. To be clear, ODF support was nowhere near as much work as the old binary filters, we are talking about XML here. However, while Import filters start with parsing the structure, in the end, extracting the basic state is no more than the ante for the real work. You need to handle the impedance mismatches between the concepts in the file format, and your implementation. ODF’s model of ‘chartness’ didn’t fit well with Gnumeric. In contrast XLSX may be ugly, but it’’s concepts were very familiar from XLS. We already had much of the code required to handle it.
I suspect most spreadsheet implementers are in the same position.
OOXML парализовал-таки работу ISO