Here is an example of file exported by NixNote:
https://framabin.org/p/?f1259f5bb5aaaee5#yvegrxKeAj3Jp+ctQ1iKOP7ckFwArW1BAfl4nDNCIRI=
The differences with Evernote export:
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some tags are different “NixNote” instead of “en”
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some tags are capitalised (e.g. < Note > or < Content >) and crash Joplin import.
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Date + hours format are different “1527160939843” = “20180524T112219Z” ! NixNote strange format crashes Joplin import.