Adding Dorsum The Ncx Inward Epub 3

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Why NCX again?

The role of an NCX file, almost unremarkably toc.ncx, is non required inward the EPUB iii standard. However, preparing files for library agents I was required to include an NCX for backwards compatibility. So hither are a few notes in addition to links to example files for reference.

Things to remember

Aside from creating an NCX file, it is besides necessary to add together the attribute toc="ncx" to your spine element, similar so,
<spine toc="ncx">
within your OPF file in addition to to include a link to the ncx within the OPF's manifest tags equally well, e.g. 
<item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml" />
Note: The actual value of the spine element's toc attribute is arbitrary, it must only jibe the id of the exceptional that is the toc.

The ncx volition hold upwardly ignored past times EPUB iii reading systems, which instead of relying on the spine toc attribute for navigation await for the "nav" holding applied to an exceptional within the manifest tags of the OPF file, e.g. 
<item id="toc" href="toc.xhtml" media-type="application/xhtml+xml" properties="nav" />

Notes

1. In the NCX file, a navpoint must hold upwardly unique inward its number, lodge in addition to content, in addition to fifty-fifty nested navpoints cannot accept the same content source.

2. The unique identifier used inward the NCX must jibe the unique identifier inward the OPF file. In the NCX file this appears inward the caput of the document similar so: 
<meta name="dtb:uid" content="6536f2b5-62b2-4659-bbef-27131f211d30"/>

2. The NCX file must non incorporate a type declaration:
<!DOCTYPE ncx PUBLIC "-//NISO//DTD ncx 2005-1//EN"    "http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">
So if the inward a higher house is introduce inward the file delete it.

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