EPUB 3.0 is the current revision of the EPUB standard. EPUB 3 was developed pursuant to a charter approved by the IDPF Membership in May, 2010. and was approved by the IDPF membership as a final Recommended Specification effective October 11, 2011. EPUB 3.0 supersedes the previous release of EPUB (2.0.1).

EPUB 3 is defined by a set of individual specifications. The best starting point for learning about EPUB 3, including the roadmap to the specification documents, is the EPUB 3 Overview .
The EPUB 3.0 specification was developed by the IDPF EPUB Working Group, consisting of IDPF member representatives and Invited Experts. All Working Group activities were conducted in an "open source" manner: the EPUB 3 Working Group project site is publicly accessible and contains a source code repository for specification and related work products and a Wiki for requirements, solutions, meeting notes, etc.
All comments on EPUB 3 specifications should be submitted via the EPUB 3 Working Group Issue Tracker, hosted on Google Code. NOTE: you must login via a Google Account in order to submit an issue. Please submit spec comments with the label "Type-ReviewComment" and additional label(s) as appropriate for the particular issue, e.g. "Spec-Publications". 

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