Anatomy of an ePUB

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What is and epub?

"EPUB (electronic publication; also sometimes ePub, EPub, or epub) is a free and open e-book standard, by the International Digital Publishing Forum (IDPF). Files have the extension .epub. EPUB is designed for reflowable content, meaning that the text display can be optimized for the particular display device. The format is meant to function as a single format that publishers and conversion houses can use in-house, as well as for distribution and sale." (source: wikipedia)

Technically, an EPUB is just a compressed ZIP file, containing a bunch of XHTML and XML, so it's easy for anyone to make your own with a wide range of tools (including the most basic text editors) and this simplicity built on top of open standards is an attractive solution for the publishing industry to support it.

Try some epubs

  • download some epubs from Project Gutenberg
  • Test on the various readers
  • unzip the epub - what's inside?