According to the
EPUB 2.0.1 OPF specs,
dtb:depth,
dtb:totalPageCount and
dtb:maxPageNumber are no longer required. (Only
dtb:id is required.) In the
previous version, they were still mentioned.
BTW, the
Apple Books Asset Guide mentions that Apple Books
calculates page numbers for TOC entries:
Quote:
Table of Contents
The main Table of Contents in Apple Books is created using a nav element with an epub:type value of "toc". Readers use the Table of Contents to navigate to key locations in the book. Note that you do not define page numbers for each entry. Apple Books calculates those for the reader to accommodate different font and screen sizes.
|
(emphasis mine)
Spoiler:
Code:
Code:
<nav epub:type="toc">
<ol>
<li><a href="chapter1.xhtml">Chapter 1</a>
<ol>
<li><a href="chapter1.xhtml#figure1">Figure 1</a></li>
</ol>
</li>
<li><a href="chapter2.xhtml">Chapter 2</a></li>
</ol>
</nav>
Maybe Apple uses a similar method for NCX TOCs and their validator doesn't like the order of toc entries in the OP's book because they don't match the spine order.