Contents 1 History 2 Features 3 Adoption 4 Implementation 4.1 Container 4.2 Publication 4.3 Contents 4.4 Media overlays 5 Software 6 See also 7 References 8 External links

History[edit] This section needs expansion with: What came before 2.0? How was it founded?. You can help by adding to it. (February 2017) A successor to the Open eBook Publication Structure, EPUB 2.0 was approved in October 2007,[4] with a maintenance update (2.0.1) approved in September 2010.[5] The EPUB 3.0 specification became effective in October 2011, superseded by a minor maintenance update (3.0.1) in June 2014.[6] New major features include support for precise layout or specialized formatting (Fixed Layout Documents), such as for comic books,[7] and MathML support. The current version of EPUB is 3.1, effective January 5, 2017.[8] The (text of) format specification underwent reorganization[9] and clean-up; format supports remotely-hosted resources and new font formats (WOFF 2.0 and SFNT)[10] and uses more pure HTML and CSS.[11] In May 2016 IDPF Members approved World Wide Web Consortium (W3C) merger,[12] "to fully align the publishing industry and core Web technology".[13]

Features[edit] The format and many readers support the following: Reflowable document: optimize text for a particular display Fixed-layout content:[14] pre-paginated content can be useful for certain kinds of highly designed content, such as illustrated books intended only for larger screens, such as tablets.[15] Like an HTML web site, the format supports inline raster and vector images, metadata, and CSS styling. Page bookmarking Passage highlighting and notes A library that stores books and can be searched Re-sizable fonts, and changeable text and background colors Support for a subset of MathML[16] Digital rights management—can contain digital rights management (DRM) as an optional layer[17] The EPUB specification does not enforce or suggest a particular DRM scheme. This could affect the level of support for various DRM systems on devices and the portability of purchased e-books. Consequently, such DRM incompatibility may segment the EPUB format along the lines of DRM systems, undermining the advantages of a single standard format and confusing the consumer.[18]

Adoption[edit] EPUB is widely used on software readers such as Google Play Books on Android and Apple iBooks on iOS and Mac, but not by Amazon Kindle e-readers. iBooks also supports the proprietary iBook format, which is based on the EPUB format but depends upon code from the iBooks app to function.[19] Data interchange EPUB is a popular format for ebook creation because it can be an open format and is based on HTML, as opposed to Amazon's proprietary format for Kindle readers. Popular EPUB producers of public domain and open licensed content, include Project Gutenberg, PubMed Central, SciELO and others.

Implementation[edit] An EPUB file is an archive that contains, in effect, a website. It includes HTML files, images, CSS style sheets, and other assets. It also contains metadata. EPUB 3 is the latest version. By using HTML5, publications can contain video, audio, and interactivity, just like websites in web browsers.[15] Container[edit] An ePub publication is delivered as a single file. This file is an unencrypted zipped archive containing a set of interrelated resources.[20] An OCF (Open Container Format) Abstract Container defines a file system model for the contents of the container. The file system model uses a single common root directory for all contents in the container. All (non-remote) resources for publications are in the directory tree headed by the container's root directory, though EPUB mandates no specific file system structure for this. The file system model includes a mandatory directory named META-INF that is a direct child of the container's root directory. META-INF stores container.xml. The first file in the archive must be the mimetype file. It must be unencrypted and uncompressed so that non-ZIP utilities can read the mimetype. The mimetype file must be an ASCII file that contains the string "application/epub+zip". This file provides a more reliable way for applications to identify the mimetype of the file than just the .epub extension.[20] An example file structure: --ZIP Container-- mimetype META-INF/ container.xml OEBPS/ content.opf chapter1.xhtml ch1-pic.png css/ style.css myfont.otf toc.ncx There must be a META-INF directory containing container.xml. This file points to the file defining the contents of the book, the OPF file, though additional alternative rootfile elements are allowed.[20] Apart from mimetype and META-INF/container.xml, the other files (OPF, NCX, XHTML, CSS and images files) are traditionally put in a directory named OEBPS. An example container.xml: <?xml version="1.0" encoding="UTF-8" ?> <container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container"> <rootfiles> <rootfile full-path="OEBPS/content.opf" media-type="application/oebps-package+xml"/> </rootfiles> </container> Publication[edit] The ePUB container must contain:[21] At least one content document. One navigation document. One package document listing all publication resources. This file should use the file extension .opf. It contains metadata, a manifest, fallback chains, bindings, and a spine. This is an ordered sequence of ID references defining the default reading order. The ePUB container may contain: style sheets. PLS Documents. media overlay documents. Contents[edit] Content documents include:[22] HTML 5 content, navigation documents, SVG documents, scripted content documents, and fixed layout documents. Contents also include CSS and PLS documents. Navigation documents supersedes the NCX grammar used in EPUB 2. Media overlays[edit] Books with synchronized audio narration are created in EPUB 3 by using media overlay documents to describe the timing for the pre-recorded audio narration and how it relates to the EPUB Content Document markup. The file format for Media Overlays is defined as a subset of SMIL.[23]

Software[edit] Many editors exist including calibre, Sigil,[24] LaTeX, and Genebook. An open source tool, called epubcheck,[25] can be used for validating and detecting errors in the structural markup (OCF, OPF, OPS), image, and XHTML files. epubcheck can either be run from the command line, used in applications,[26][27][28] used in Java applications as a library,[29] and used online at EPUB Validator.[30] Readers exist for all major hardware platforms with the exception of Amazon Kindle, including Google Play Books (Android and iOS) and Apple iBooks (MacOS and iOS).

See also[edit] MHTML – a webpage archive format used to combine resources in a single document

References[edit] ^ "Specifications". IDPF. Retrieved January 12, 2017.  ^ "OPS 2.0 Elevated to Official IDPF Standard". IDPF. eBooklyn. Oct 15, 2007.  ^ "Endorsement of EPUB 3". BISG. Book Industry Study Group. Retrieved 18 September 2015.  ^ "Older Versions of EPUB | International Digital Publishing Forum". Retrieved 2017-05-10.  ^ "1.1 EPUB Revision History". IDPF. 11 October 2011.  ^ "EPUB 3.0 | International Digital Publishing Forum". Retrieved 2017-01-12.  ^ Rothman, David (July 27, 2008). "The ePub torture test: Starring 'Three Shadows,' a graphic novel". TeleRead: Bring the E-Books Home.  ^ "EPUB 3.1 | International Digital Publishing Forum". Retrieved 2017-01-12.  ^ "EPUB 3.1 Changes from EPUB 3.0.1". Retrieved 2017-01-12.  ^ "EPUB 3.1 Changes from EPUB 3.0.1". Retrieved 2017-01-12.  ^ "EPUB 3.1 Changes from EPUB 3.0.1". Retrieved 2017-01-12.  ^ "IDPF Members Approve W3C Merger - Publishing Perspectives". 9 November 2016.  ^ "World Wide Web Consortium (W3C) and International Digital Publishing Forum (IDPF) Explore Plans to Combine".  ^ "Fixed-Layout Properties". International Digital Publishing Forum. Retrieved 11 September 2015.  ^ a b "Understanding EPUB 3". EPUBZone. International Digital Publishing Forum. Retrieved 11 September 2015.  ^ "Embedded MathML". IDPF. Retrieved 12 September 2015.  ^ "Digital Book Standards FAQs". IDPF. November 20, 2006. Archived from the original on 2009-09-03.  ^ Rothman, David (August 13, 2009). "Adobe-DRMed ePub isn't 'open': Why the New York Times urgently needs to clarify its Sony eBook Store article". TeleRead: Bring the E-Books Home. Archived from the original on October 14, 2009.  ^ Arnold Kim (January 19, 2012). "New ibooks not technically in epub format". MacRumors.  ^ a b c "EPUB Open Container Format (OCF) 3.0 – Recommended Specification". IDPF. Retrieved 11 September 2015.  ^ "EPUB Publications". IDPF. Retrieved 12 September 2015.  ^ "EPUB Content Documents". IDPF. Retrieved 12 September 2015.  ^ "EPUB Media Overlays". IDPF. Retrieved 12 September 2015.  ^ ^ ^ epubcheck GUI ^ ^ ^ ^

External links[edit] EPUB Validator (beta) Article "EPUB" at the MobileRead Wiki ePub Validator - This utility allows validation of the epub file to ePub standard 1.0.5 v t e E-books Formats ePub FictionBook CBR/CBZ Kindle File Format Mobipocket PDF Plain text Reading Devices Amazon Kindle Barnes & Noble Nook Bookeen Elonex ebook enTourage eDGe Hanlin eReader iriver Story Kobo eReader Onyx Boox Plastic Logic Reader PocketBook eReader Rocket eBook SoftBook Smartphones Tablets Tolino Software Adobe Acrobat Adobe Digital Editions Aldiko Blio Bluefire Reader Calibre FBReader Google Play Books iBooks Kindle app Kitabu Kobo Lektz Lucifox Okular OverDrive Media Console Snapplify STDU Viewer Sumatra PDF Editing ABBYY FineReader AbiWord Adobe InDesign Adobe RoboHelp Atlantis Word Processor Booktype Calibre Calligra Author eXeLearning Help & Manual HelpNDoc iBooks Author iStudio Publisher LaTeX LibreOffice MadCap Flare Oxygen XML Editor PagePlus Pages QuarkXPress Scrivener Sigil Writer2epub Vendors Commercial Amazon Kindle Store Baen Free Library Barnes & Noble Booktrack Feedbooks Google Play iBooks Store Kobo Bookstore Sony Reader Store Smashwords Noncommercial HathiTrust Internet Archive Project Gutenberg Australia Canada Wikisource Related topics Academic journal publishing reform Braille e-book Comparison of e-book readers Comparison of iOS e-book reader software Comparison of Android e-book reader software E-book lending Electronic publishing iBooks Author Conference International Digital Publishing Forum Kindle single OPDS Reflowable document Semantic publishing Retrieved from "" Categories: Computer file formatsDocument-centric XML-based standardsE-booksElectronic paper technologyEPUB readersOpen formatsWorld Wide Web ConsortiumHidden categories: Pages using deprecated image syntaxAll articles with unsourced statementsArticles with unsourced statements from February 2017Articles to be expanded from February 2017All articles to be expandedArticles using small message boxes

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