So, if you look at a doc as a set of objects, OnlyOffice's object models corresponds to OOXML specifications, while Libre's object model corresponds to ODF's ones.' The makers of OnlyOffice claimed that 'all the objects present in OnlyOffice are created strictly according to MS Office format specs. Some Microsoft Office rivals made the decision to use Microsoft's formats as their own native formats.

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The library also notes the interest in converting documents from OOXML to ODF and said: 'Although simple documents can be effectively converted, a round-trip to an identical document should never be expected.' docx, which it considers an 'acceptable format for textual works,' unlike the older binary Microsoft Office formats. Regarding ODF, it said: 'Despite official mandates and recommendations, adoption of ODF formats has been slow, particularly in the US,' and reveals that the library has 'around 52,000 files' with formats in the ODF family.Īs for OOXML, the library said that it has nearly 800,000 files in.

The US Library of Congress has some pragmatic notes on these formats. In practice, therefore, the Strict format is less well supported than Transitional – even though Microsoft has offered Strict as an option since 2012. This is the issue referenced by The Document Foundation above yet LibreOffice itself saves in the Transitional format, and an open issue to support Strict gets little attention. A further complication is that in theory a variety of OOXML called Strict is the preferred standard, but in practice everyone (including Microsoft) uses OOXML Transitional, and realistically it seems that the period of transition may never end.

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