Is this what we're talking about?:
<dc:identifier opf:scheme="UUID" id="BookId">urn:uuid:3f219299-e69b-41b7-b163-17aeb2668e9b</dc:identifier>
It's an epub2, and it passes Epubcheck.
I always split by placing the cursor, left-clicking, then clicking on the file-split icon in the second menu line. If that's a bad idea, why is the option there and so easy to use?
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