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Old 02-14-2015, 01:00 AM   #1
zz2000
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EpubCheck

Immediately after calibre conversion, my epub validated using EpubCheck version 3.0.1

But after removing calibre_bookmarks.txt with the editor, the following problem was found.
Type File Line Position Message
ERROR content.opf 17 14 element "metadata" incomplete; missing required element "dc:language"

Please help
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Old 02-14-2015, 01:34 AM   #2
kovidgoyal
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Specify a language for the book in its metadata.
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Old 02-14-2015, 01:50 AM   #3
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chronology of incidents

1. It is there generated by calibre during convesion from zip to epub
<meta name="dc.language" content="English"/>

2. Validated ok

3. Removed calibre_bookmarks.txt with calibre editor

4. Did not validate, with ERROR content.opf 17

Last edited by zz2000; 02-14-2015 at 01:54 AM. Reason: incomplete post
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Old 02-14-2015, 02:03 AM   #4
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<meta name="dc.language" content="English"/>

cannot validate OK. What you need is a language declaration in the OPF file, that looks like

<dc:language>en</dc:language>
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Old 02-14-2015, 02:15 AM   #5
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<meta name="dc.language" content="English"/> was added by calibre.

How do I add <dc:language>en</dc:language>
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Old 02-14-2015, 02:37 AM   #6
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Quote:
Originally Posted by zz2000 View Post
<meta name="dc.language" content="English"/> was added by calibre.

How do I add <dc:language>en</dc:language>
@zz2000 - in Metadata Edit select Language(s) from the drop down list, save changes, and Polish the EPUB. That should put the dc:language element into the EPUB's content.opf file.

BR
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Old 04-09-2015, 01:35 AM   #7
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My problem is solved. I'm documenting this for others who may face the same problem.

If calibre conversion is successful, your epub should validate.

However, if you browse your epub with calibre, some changes will be made to your epub, causing the already validated epub to fail validation.

If you need to check your epub before submission to Amazon, smashwords ... whatever, make a COPY of your epub file and check that.
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Old 04-09-2015, 03:37 AM   #8
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The only change that should be made is adding the bookmarks file, and that can be disabled in the preferences.
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