Hvad er en NCX fil?
NCX-filen forkortet som en Navigation Control-fil til XML, normalt kaldet toc.ncx. Denne fil består af den hierarkiske indholdsfortegnelse for en EPUB-fil. Specifikationen for NCX er udviklet til Digital Talking Book (DTB), og dette filformat vedligeholdes af DAISY Consortium og er ikke en del af EPUB-specifikationen. NCX-filen indeholder en mime-type af application/x-dtbncx+xml i den.
NCX-specifikation
The NCX file contains various kinds of XML tags. The meta tags like meta name="dtb:uid" is used to mention the ID. The meta name="d-datb:depth" element is set equal to the depth of the navMap tag element. The navPoint elements can be nested to create a hierarchical table of contents. The content of navLabel is the text that appears in the table of contents generated by reading systems that use the .ncx. The content of navPoint element points to a content document listed in the manifest and can also include an element identifier
A description of certain exceptions to the NCX specification as used in EPUB. Here you can view the example of an NCX file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ncx PUBLIC "-//NISO//DTD ncx 2005-1//EN"
"http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">
<ncx version="2005-1" xml:lang="en" xmlns="http://www.daisy.org/z3986/2005/ncx/">
<head>
<!-- The following four metadata items are required for all NCX documents,
including those that conform to the relaxed constraints of OPS 2.0 -->
<meta name="dtb:uid" content="123456789X"/> <!-- same as in .opf -->
<meta name="dtb:depth" content="1"/> <!-- 1 or higher -->
<meta name="dtb:totalPageCount" content="0"/> <!-- must be 0 -->
<meta name="dtb:maxPageNumber" content="0"/> <!-- must be 0 -->
</head>
<docTitle>
<text>Pride and Prejudice</text>
</docTitle>
<docAuthor>
<text>Austen, Jane</text>
</docAuthor>
<navMap>
<navPoint class="chapter" id="chapter1" playOrder="1">
<navLabel><text>Chapter 1</text></navLabel>
<content src="chapter1.xhtml"/>
</navPoint>
</navMap>
</ncx>
