ERROR(NCX-001) - NCX identifier Not Match
Q
How to fix the "ERROR(NCX-001) - NCX identifier ... does not match OPF identifier ..." error?
✍: FYIcenter.com
A
When you validate a EPUB 2.0 package with EpubCheck, you may see
the following error:
C:\fyicenter> java -jar epubcheck.jar Error-NCX-ID-Not-Match-2.0.epub
Validating using EPUB version 2.0.1 rules.
ERROR(NCX-001): Error-NCX-ID-Not-Match.epub/navigation.xml(-1,-1):
NCX identifier ("Hello") does not match
OPF identifier ("fyicenter.com.epub.hello").
Check finished with errors
Messages: 0 fatals / 1 error / 0 warnings / 0 infos
EPUBCheck completed
Download Error-NCX-ID-Not-Match-2.0.epub, and unzip it. You see the package file "package.opf" defines "fyicenter.com.epub.hello" as the EPUB package's unique identifier:
...
<package xmlns="http://www.idpf.org/2007/opf" version="2.0"
unique-identifier="MyID">
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:title>Hello</dc:title>
<dc:identifier id="MyID">fyicenter.com.epub.hello</dc:identifier>
<dc:language>en-US</dc:language>
</metadata>
...
But the navigation file (or NCX file) refers it as "Hello":
<?xml version="1.0" encoding="utf-8"?>
<!-- navigation.xml
Copyright (c) 2018 FYIcenter.com
-->
<ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1">
<head>
<meta content="Hello" name="dtb:uid"/>
</head>
<docTitle>
<text>Hello</text>
</docTitle>
<navMap>
<navPoint id="link1">
<navLabel>
<text>Hello</text>
</navLabel>
<content src="/content.xhtml"/>
</navPoint>
</navMap>
</ncx>
You can fix the error by changing content="Hello" to content="fyicenter.com.epub.hello".
⇒ Errors in GeographyofBliss_oneChapter.epub
⇐ ERROR(OPF-030) - unique-identifier Not Found
2022-11-04, ∼1786🔥, 0💬
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