Quote:
Originally Posted by Snekguy
Just in case anyone else comes across the same issue, here's a summary of what went wrong and how I was able to resolve it.
Problem: EPUBcheck looks for XHTML file extensions and doesn't find them.
Solution: Export the EPUB as version 2 instead of version 3, bypassing the XHTML requirement.
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Better solution: Rename the files to xhtml from html. With either Sigil or calibre's e-book editor, it's pretty trivial. This allows you to use epub3 enhancements especially the accessibility related ones.