For a given document, saved as OpenDocument, in LibreOffice, is there a hopefully convenient way to *locally* (no cloud service) find out which (if any) features it uses which can not be represented in the strict standard ODF format but only in Extended? (For example: if one switches from ODF "1.4 Extended" to "1.4" what's lost?)

It's fine if it's just a list like "this document uses the following features somewhere that require Extended".

#DuckDuckFedi #AskFedi #LibreOffice #OpenDocument #ODF

@mkj I was under the impression that Libre office saved always using extended as per latest Oasis specs.
Had to check that time ago with a related pandoc issue working with ODTs
@ricardo There's a setting for that (Tools > Options > Load/Save > General > Default File Format and ODF Settings, in the version on my system). Extended is recommended but strict standards-conforming is possible.
@mkj Yes, that's what I was referring to, depending on the version of LibreOffice you're using you will have more modern ODF versions, which if I'm not mistaken, include the previous "extended" in the latest released "standard"
https://www.heise.de/en/news/OASIS-ratifies-Open-Document-Format-1-4-as-a-standard-11102424.html
OASIS ratifies Open Document Format 1.4 as a standard

The standardization organization OASIS has ratified ODF 1.4. The open document format offers some new features for office suites.

heise online

@ricardo Yes, that's the general idea as I understand it. But "1.4 Extended", also as I understand it, includes things that are not in 1.4 and may or may not be in, but certainly likely won't be using the same schema, in a future 1.5.

My ultimate goal is to use the current actual standard if at all possible. Since that means that anything not covered by the current standard can't be represented, I want to know what, if anything, I'm actually doing in a document that's *not* thus representable.