Quote:
Originally Posted by kovidgoyal
Open the book in the calibre editor, open the content.opf file in the book. Look for prefix="something" from that something delete the calibre:... part
And before doing this in the editor preferences, under integration with calibre turn off the setting to update metadata. This will prevent opening the book in the editor re-adding the calibre prefixes.
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Thanks for your time, Kovid

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That got rid of [ERROR]OEBPS/content.opf: 2,213: URL expected instead of calibre:
But--
[ERROR]OEBPS/content.opf: 22,46: Undecleared prefix: calibre
remains.
I'm guessing from my research that I need to remove some part of this line in the opf:
<meta property="calibre:author_link_map">{"Susan Larson": ""}</meta>
</metadata>
Can you please advise?
And thanks for the info on turning off "update metadata" The return of text that I had edited out was driving me wild.