What is ePub?
“.epub” allows publishers to produce and distribute a ‘digital publication’ file and offer consumers interoperability between software and hardware for unencrypted reflowable digital books.
In October 2007 the OPS 2.0 was elevated to an Official IDPF Standard. The “.epub” file extension is an XML file format for reflowable digital books and publications. ePub is composed of three open standards, the Open Publication Structure (OPS), Open Packaging Format (OPF) and Open Container Format (OCF) all produced by the IDPF (International Digital Publishing Forum).
In actuality, the “.epub” file is just a renamed .zip archive. Contained with this archive are the books files, either XHTML or DTBook, and along with a number of XML description and navigation files there are sometimes image/media files.
