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I do not have an empty NCX. Here is my NCX:
<?xml version='1.0' encoding='utf-8'?>
<ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1" xml:lang="en">
<head>
<meta content="98160948-0367-400e-ad9b-07537e37a9ef" name="dtb:uid"/>
<meta content="2" name="dtb:depth"/>
<meta content="calibre (0.8.51)" name="dtb:generator"/>
<meta content="0" name="dtb:totalPageCount"/>
<meta content="0" name="dtb:maxPageNumber"/>
</head>
<docTitle>
<text>Foo</text>
</docTitle>
<navMap>
<navPoint id="deb7899f-3f43-42e1-aba4-be8924c74e48" playOrder="1">
<navLabel>
<text>Start</text>
</navLabel>
<content src="foo_split_001.html"/>
</navPoint>
</navMap>
</ncx>
The complete ebook gives several validation errors for the actual content (apparently Calibre has some bugs), but it makes no complaint about the toc.ncx or any other part of the navigation apparatus. (To be clear: the EPUB as originally output by Calibre gives exactly the same validation errors as the EPUB I produce by editing the TOC.)
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