Thanks to all who replied!
When I delete "+xhtml" from the "application/oebps-package+xml" path and then try to validate the ePub, I get about 30 error messages. I originally included "xhtml" because most of the files in the OEBPS folder are XHTML, not XML.
Also, the "package.opf" file is in the OEBPS folder so I don't think that's the problem.
|