Because this is an EPUB 3.0 document, it has a NAV file (newly defined in EPUB 3).
However, it does not have an NCX file (required for backward compatibility with EPUB 2).
The Nav file (bk01-toc.html) covers the Chapter and Section levels.
O'Reilly produces a large number
of high-quality technical reference works for software developers.
Let's examine their EPUB archive for Accessible EPUB 3.
The file tree contains about 100 files,
about two dozen of which (e.g., HTML) reside in the EPUB directory (tsk).
The images reside in the EPUB/covers and EPUB/images directories.
The spine entry lists the enclosed content files, in the "normal" reading order.
Note that there is no guide section.
The OEBPS/package.opf file contains one indications that bk01-toc.html is the Nav file:
the manifest entry for item htmltoc
bk01-toc.html is an XHTML file,
which guarantees some useful syntactic decorum (e.g., closing tags).
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