Overwriting? You mean that if there is already a <dc:identifier id="bookid">urn:uuid:KEY</dc:identifier> in my content.opf file, I can't add the ISBN aswell in the way I've been doing it? Dang, how come I don't know that and FlightCrew never told me?
Quote:
Originally Posted by DiapDealer
One more reason to use Sigil's GUI metadata editor to initially add new metadata. You can always alter the details manually later if need be.
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Whoa! I'm not very proud to say that I
never noticed that there was a 'More' box in the metadata editor that gave access to something else than title/author/language...

Is that something new? I can't believe I never saw that. Thank you for that. In my specific case, for example, is there a way to add those two separate dates — original-publication and epub-publication — with the GUI editor? Doesn't seem so. Closest match is "Date of publication".
Well... Thanks a lot. This was quite helpful. Good thing I posted this question, it was about time I learn about this GUI medata editor! Karma for you!