What Is EPUB File Structure

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What Is the EPUB file structure?

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An EPUB file is actually a ZIP archive file that contains the following types of files in sub-folders:

HTML, image and audio files for book contents.
CSS files for presentation.
OPF files for book structure and navigations.
Other resource and meta files.

Here is a list of files and sub-folders in a very simple EPUB file:

|-- mimetype
|-- package.opf
|-- content.xhtml
|-- navigation.xhtml
|-- META-INF
    |-- container.xml

EPUB specification is developed by the W3C EPUB 3 Community Group. Here is a list of EPUB versions and their release dates:

Version      Release Date
----------   ------------
EPUB 3.3     Draft
EPUB 3.2     May  8, 2019
EPUB 3.1     Jan 25, 2017
EPUB 3.0.1   2014
EPUB 3.0     Oct 11, 2011
EPUB 2.0     2007

⇒ What Is OPF

⇐ What Is EPUB

⇑ Introduction to EPUB

⇑⇑ EPUB Tutorials

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