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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Electronic Publication (EPUB)
EPUB logo.svg
Filename extension .epub
Internet media type application/epub+zip
Magic number PK 0x03 0x04
Developed by International Digital Publishing Forum (IDPF)
Initial release September 2007; 10 years ago (2007 -09)
Latest release
3.1
(January 5, 2017; 8 months ago (2017-01-05)[1])
Type of format e-book file format
Contained by OEBPS Container Format (OCF; Zip)
Extended from Open eBook, XHTML, CSS, DTBook
Standard ISO/IEC TS 30135
Open format? Yes
Website www.idpf.org/epub

EPUB is an e-book file format with the extension .epub that can be downloaded and read on devices like smartphones, tablets, computers, or e-readers. It is a technical standard published by the International Digital Publishing Forum (IDPF). The term is short for electronic publication and is sometimes styled ePub. EPUB became an official standard of the IDPF in September 2007, superseding the older Open eBook standard.[2] The Book Industry Study Group endorses EPUB 3 as the format of choice for packaging content and has stated that the global book publishing industry should rally around a single standard.[3] EPUB is the most widely supported vendor-independent XML-based (as opposed to PDF) e-book format; that is, it is supported by the largest number of hardware readers.[citation needed]

History[edit]

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maintenance update (2.0.1) approved in September 2010.[5] The EPUB 3.0 specification became effective in October 2011, superseded by a minor maintenance update (3.0.1) in June 2014.[6] New major features include support for precise layout or specialized formatting (Fixed Layout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 and market share[edit]

It is also widely used on many software readers such as iBooks on iOS and Google Books on Android, but notably not by the 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]

As final product
As in the eBook market PDF format is not generally sold at sites that sell eBooks, the EPUB participation in the eBook market is very low. The main EPUB producers are suppliers of public domain and open licensed content, as Project Gutenberg, PubMed Central, SciELO and many others. In that context is growing and replacing the PDF format.
Data interchange
EPUB is a popular way to feed the ebook creation process, because it is an open format and is based on HTML, while Amazon's format is proprietary. EPUB is the "first step" (initial) format of the content in many production processes and supply chains.

Implementation[edit]

An EPUB file is a ZIP archive that contains, in effect, a website—including 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 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:

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]

  1. ^ "Specifications". IDPF. Retrieved January 12, 2017. 
  2. ^ "OPS 2.0 Elevated to Official IDPF Standard". IDPF. eBooklyn. Oct 15, 2007. 
  3. ^ "Endorsement of EPUB 3". BISG. Book Industry Study Group. Retrieved 18 September 2015. 
  4. ^ "Older Versions of EPUB | International Digital Publishing Forum". idpf.org. Retrieved 2017-05-10. 
  5. ^ "1.1 EPUB Revision History". IDPF. 11 October 2011. 
  6. ^ "EPUB 3.0 | International Digital Publishing Forum". idpf.org. Retrieved 2017-01-12. 
  7. ^ Rothman, David (July 27, 2008). "The ePub torture test: Starring ‘Three Shadows,’ a graphic novel". TeleRead: Bring the E-Books Home. 
  8. ^ "EPUB 3.1 | International Digital Publishing Forum". idpf.org. Retrieved 2017-01-12. 
  9. ^ "EPUB 3.1 Changes from EPUB 3.0.1". www.idpf.org. Retrieved 2017-01-12. 
  10. ^ "EPUB 3.1 Changes from EPUB 3.0.1". www.idpf.org. Retrieved 2017-01-12. 
  11. ^ "EPUB 3.1 Changes from EPUB 3.0.1". www.idpf.org. Retrieved 2017-01-12. 
  12. ^ "IDPF Members Approve W3C Merger - Publishing Perspectives". 9 November 2016. 
  13. ^ "World Wide Web Consortium (W3C) and International Digital Publishing Forum (IDPF) Explore Plans to Combine". 
  14. ^ "Fixed-Layout Properties". International Digital Publishing Forum. Retrieved 11 September 2015. 
  15. ^ a b "Understanding EPUB 3". EPUBZone. International Digital Publishing Forum. Retrieved 11 September 2015. 
  16. ^ "Embedded MathML". IDPF. Retrieved 12 September 2015. 
  17. ^ "Digital Book Standards FAQs". IDPF. November 20, 2006. Archived from the original on 2009-09-03. 
  18. ^ 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. 
  19. ^ Arnold Kim (January 19, 2012). "New ibooks not technically in epub format". MacRumors. 
  20. ^ a b c "EPUB Open Container Format (OCF) 3.0 – Recommended Specification". IDPF. Retrieved 11 September 2015. 
  21. ^ "EPUB Publications". IDPF. Retrieved 12 September 2015. 
  22. ^ "EPUB Content Documents". IDPF. Retrieved 12 September 2015. 
  23. ^ "EPUB Media Overlays". IDPF. Retrieved 12 September 2015. 
  24. ^ https://sigil-ebook.com/
  25. ^ https://github.com/idpf/epubcheck
  26. ^ epubcheck GUI
  27. ^ https://github.com/IDPF/epubcheckGUI
  28. ^ https://www.pagina.gmbh/produkte/epub-checker/
  29. ^ https://github.com/IDPF/epubcheckLibrary
  30. ^ http://validator.idpf.org/

External links[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

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