Calibre puts in <dc:contributor id="id-6"/>
Calibre keeps putting in this line and its accompanying line.
<opf:meta property="role" refines="#id-6" scheme=
<dc:contributor id="id-6"/> fails epub checker and I figured out why
The line should be <dc:contributor id="id-6">String length of at least 1</dc:contributor>
If I fix that line like that, then Calibre would put in
<dc:contributor id="id-7"/> and
<opf:meta property="role" refines="#id-7" scheme=
If I delete those two lines, save, close the editor, and reopen the editor they magically return.
The work around would be to get as far as I can, then open the epub file manually and remove the lines, but as soon as I have to go back into Calibre, it will put the lines in and that means epub checker failure.
Calibre 2.72 64-bit on Win 7 Pro 64-bit