From what I've heard from some developers of Abiword and Gnumeric, the ODF formats end up being reflections of openoffice.org's internal structure rather than well-designed formats. One even said that Microsoft's spreadsheet format was better designed (licensing issues aside of course).
While Jones is correct in her assessment of the viability of MS' XML, the ODF grassroots appear to me to be made of OO.o astroturf.
Corrections welcome of course -- I'm pretty ignorant about the topic.
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