Um, I'm not sure if you people are helping me, or confusing me even more.
I thought I'd go looking for an example of "valid" metadata in epub3 format, if only to see how they do those items in question, and came across this page...
https://code.google.com/p/epub-sampl...UB/package.opf
For that aforementioned ISBN item, where before I had this...
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<dc:identifier xmlns:ns2="http://www.idpf.org/2007/opf" ns2:scheme="ISBN">978-0-9680573-5-3</dc:identifier>
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...on that example page they had this...
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<dc:identifier id="pub-identifier">urn:isbn:9781449328030</dc:identifier>
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...so I just switched out my code for theirs (with my ISBN number, of course).
The other two metadata items that I had which had the word "scheme" in them were...
Quote:
<dc:identifier opf:scheme="calibre">ab26fb4c-2009-488d-9299-5711d36d9663</dc:identifier>
<dc:identifier xmlns:ns1="http://www.idpf.org/2007/opf" ns1:scheme="calibre">ab26fb4c-2009-488d-9299-5711d36d9663</dc:identifier>
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I certainly didn't put those in, in my original epub that I made in Sigil -- Calibre must have inserted those. So I delete them, saved my book, and with my book still open nothing changes.
But then I close my book, open it again -- and they're BACK! Calibre obviously inserts those things on its own, even if you delete them.
I find all this epub3 stuff absolutely exasperating. I can't believe that there's not some simple software that could easily convert an ebook from epub 2 to 3 -- or at least a decent, NON-confusing tutorial to explain how -- never mind epubcheck, too, which only runs in a command line and which I find frustrating to use. I don't know why someone hasn't made a GUI version of that, too.
I really appreciate everyone's help with this, but I think I'm just too old (or stupid) to learn how to get this book converted to epub3 -- at least, not without having to surmount what is a VERY steep learning curve for me. It's unfortunate to not add in that nice audio file to go along with my sheet music, but until they come up with an easier, simpler way of making epub3 books (for old dummies like me), I guess I'll just have to live with that. :/
Of course, with that said, I'm still open to suggestions for how to actually
do this -- at least, if it's an easy/easily-understood one.