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e-letter wrote:
On 17/03/2014, Italo Vignoli <> wrote:

Nothing happens when XML tags are ignored, to systems which are not
supporting the ODF 1.2 Extended document format. This is the reason why
we can suggest to use ODF 1.2 Extended as the preferred format, because
backward compatibility is maintained.

Thanks to the odf implementor notes web page, how can this claim be
true when these LO "features" break odf validation?

I haven't seen anything to say that the extensions prevent validation of ODF documents. The implementer notes you refer to say, under Extension namespaces, "Elements and attributes that are not defined in an ODF specification yet... have to be written with an extension namespace, otherwise validators will complain about invalid elements or attributes." This suggests that the standard and validators allow for extensions to the format.

Presumably extensions to the format would be ignored by applications not supporting that extension, but the rest of the document show as intended. e.g. with the extension for font embedding, applications supporting the extension would use the embedded fonts, while others would ignore the embedded fonts and use those on the system (as if the fonts were not embedded at all).

Somewhere in the wiki there is a list of the extended features, but
please remember that we are speaking of a document format and not of
software features. So, most of the new LibreOffice features do not
impact the document format.

If LO "feature" (most likely designed to provide some sort of
"compatibility" with m$) prevent odf validation, the document format
must be impacted. Or is this a false conclusion?

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