The navigation document replaces the epub 2 ncx document ops2. Refer to the idpf issue reporting guidelines for more. I definitely dont want to hobble my mobi files but i have noticed that when using coresource to push files to amazon, amazon is validating against epub 2. Its development was chartered in 2009, and the final standard was approved by the idpf membership as a recommended. Epub enables the creation and transport of reflowable digital books and other types of content as singlefile digital publications that are interoperable between disparate epub compliant reading. This content is built on the open web platform and comes in two flavours. Epub 3 defines a distribution and interchange format for digital. Moving from epub 2 to epub 3 is a breeze, an interview to luc. This document informatively describes the changes in epub 3 from the previous release, epub 2. Epub, electronic publication, version 2 library of congress. Epub 3, the third major revision of epub, is defined by a set of specification documents including this document, which defines publicationlevel semantics and conformance requirements for epub 3. Epub 3 was designed in 2010 by idpf with help from daisy consortium on modern and sustainable standards from the open web platform. This specification, the open container format ocf, is one third of a triumvirate of modular specifications that make up the epub publication format.
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