3

I've been looking at a few different ePub3s (programatically, not through ePub-specific software), and notive that the navigation document containing the TOC doesn't seem to be constantly named.

Is there a way of finding it, other than through reading each file for the relevant HTML?

Thanks

Edit: Digging around further, perhaps the package.opf is the answer: <item id="nav_1" href="nav.xhtml" media-type="application/xhtml+xml" properties="nav"></item>?

1

I'll post an answer which seems to be working for me.

I found relevant documentation here: http://www.idpf.org/epub/30/spec/epub30-publications.html#sec-package-documents

Using Ruby and Nokogiri, I decompressed the ePub file, read the package document as HTML, then used an XPath statement:

unzipped_file   = Zip::File.open(epub_file)
package_file    = unzipped_file.glob("*/package.opf").first
package_as_html = Nokogiri::HTML(package_file.get_input_stream.read)
package         = package_as_html.at_xpath("html/body/package")

nav_file_name   = package.
                    at_xpath("manifest/item[@properties='nav']").
                    attribute("href").
                    text

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.