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On 16/03/2014, Italo Vignoli <> wrote:
ODF as implemented by OpenOffice and then LibreOffice has always been
the "extended" version, and not the "strict standard" version, although
it has always been possible to choose the latter. ODF become a standard
in 2006, based on OOo 2.0 (2005) file format, but OOo was already
shipping some additional features which have been integrated in ODF 1.2
(consolidated in 2008, and standardized in 2011).

Thanks for this information. The difference between extended and
strict allows for confusion to occur. In the option
"load/save,general", there is no option "strict standard", only 10/11,
12, 12extended.

Today, LibreOffice integrates some additional features in ODF 1.2, which
will hopefully become part of ODF 1.3 (like font embedding). In general,
saving as ODF 1.2 Extended does not create problem to users of other ODF
compatible software, as the format is backward compatible (so font
embedding will not create problems, but will not be recognized by other

How can font-embed occur if affected by licence restrictions on a font
(e.g. font x is licenced to be used only on gpl systems)?

This is the reason why LibreOffice suggests ODF 1.2 Extended, and not
the ODF 1.2 "strict" version. Being the format XML based, the tags will
not be recognized if they belong to ODF 1.2, but this will not create
problems to the document.

So how are non-standard elements treated when ignored?

It seems safer to select either odf 10/11 or 12"strict". Is there a
definitive list of these LO 12extended "features" so that users can
decide if it beneficial to use them, or revert to standard odf?

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