An interesting question popped up on twitter today can anyone in #eprdctn confirm that the nav file can be named something other than nav.xhtml & still operate OK? seeing nothing in spec — Iris Amelia 📎✊🏽 (@epubpupil) January 31, 2017 and it reminded me about how we become so used to the names we assign to files and folders within our EPUB structures that we might forget which are set in stone and which we've assigned or have been arbitrarily assigned by apps like InDesign for us. Thankfully it is fairly clear cut. The mimetype and files within the META-INF folder (along with the folder itself) have fixed names. But the only required one that must be in the folder is the container.xml file and this file identifies the root file of the EPUB package, i.e. the one that identifies the location of all the others. All other files and folders can have their names freely chosen (within the limits of unicode). META-INF/container.xml The IDPF provides the following examp
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