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Adapted from Wikipedia and Liza Daly atrile  Build a digital book with EPUB published on IBM DeveloperWorks

The EPUB format has gained popularity as a vendor-independent XML-based e-book format. The format can be read by the Kobo eReader, Blackberry Playbook, Apple's iBooks app running on iOS devices such as the iPhone, iPod Touch and iPad, Barnes and Noble Nook and several other devices. It also can be read via the Mozilla Firefox add-on EPUBReader, and Okular

It also can be used as a debugging format for Kindle books as conversion to Kindle format is easy and can be automated.

An EPUB file uses XHTML 1.1 to construct the content of a book as of version 2.0.1.  An EPUB file is ZIP archive containing a group of files that conform to the OPS/OPF standards. The OCF specifies how to organize these files in the ZIP, and defines two additional files that must be included.

A minimally conforming EPUB bundle has several required files root directory and two folders with fixed names:

The specification is quite strict about the format, contents, and location of those files within the EPUB archive. This section explains what you must know when you work with the EPUB standard.

The basic structure of a minimal EPUB file follows the pattern :

mimetype
META-INF/
   container.xml
OEBPS/
  content.opf
  title.html
  content.html
  stylesheet.css
  toc.ncx
  images/
     cover.png

Note: A sample book following this pattern is available from Downloads, but I recommend that you create your own as you follow the tutorial.

To start building your EPUB book, create a directory for the EPUB project. Open a text editor or an IDE such as Eclipse. I recommend using an editor that has an XML mode for example Microsoft XML Editor which is included in Visual Studio Express Web Edition.

The mimetype file

This one's pretty easy: The mimetype file is required and must be named mimetype. The contents of the file are always:

application/epub+zip

Note that the mimetype file cannot contain any newlines or carriage returns.

Additionally, the mimetype file must be the first file in the ZIP archive and must not itself be compressed. You'll see how to include it using common ZIP arguments in Bundling your EPUB file as a ZIP archive. For now, just create this file and save it, making sure that it's at the root level of your EPUB project.

META-INF/container.xml

At the root level of the EPUB, there must be a META-INF directory, and it must contain a file named container.xml. EPUB reading systems will look for this file first, as it points to the location of the metadata for the digital book.

Create a directory called META-INF. Inside it, open a new file called container.xml for writing. The container file is very small, but its structural requirements are strict. Paste the following code   into META-INF/container.xml.

<?xml version="1.0"?>
<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>

The value of full-path (in bold) is the only part of this file that will ever vary. The directory path must be relative to the root of the EPUB file itself, not relative to the META-INF directory.

More about META-INF

The META-INF directory can contain a few optional files, as well. These files allow EPUB to support digital signatures, encryption, and digital rights management (DRM). These topics are not covered in this tutorial. See the OCF specification for more information.

The mimetype and container files are the only two whose location in the EPUB archive are strictly controlled. As recommended (although not required), store the remaining files in the EPUB in a sub-directory. (By convention, this is usually called OEBPS, for Open eBook Publication Structure, but can be whatever you like.)

Next, create the directory named OEBPS in your EPUB project. The following section of this tutorial covers the files that go into OEBPS—the real meat of the digital book: its metadata and its pages.

Open Packaging Format metadata file

Although this file can be named anything, the OPF file is conventionally called content.opf. It specifies the location of all the content of the book, from its text to other media such as images. It also points to another metadata file, the Navigation Center eXtended (NCX) table of contents.

The OPF file is the most complex metadata in the EPUB specification. Create OEBPS/content.opf, and paste the contents

<?xml version='1.0' encoding='utf-8'?>
<package xmlns="http://www.idpf.org/2007/opf"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            unique-identifier="bookid" version="2.0">
  <metadata>
    <dc:title>Hello World: My First EPUB</dc:title>
    <dc:creator>My Name</dc:creator>
    <dc:identifier
id="bookid">urn:uuid:0cc33cbd-94e2-49c1-909a-72ae16bc2658</dc:identifier>
    <dc:language>en-US</dc:language>
    <meta name="cover" content="cover-image" />
  </metadata>
  <manifest>
    <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml"/>
    <item id="cover" href="title.html" media-type="application/xhtml+xml"/>
    <item id="content" href="content.html"
media-type="application/xhtml+xml"/>
    <item id="cover-image" href="images/cover.png" media-type="image/png"/>
    <item id="css" href="stylesheet.css" media-type="text/css"/>
  </manifest>
  <spine toc="ncx">
    <itemref idref="cover" linear="no"/>
    <itemref idref="content"/>
  </spine>
  <guide>
    <reference href="title.html" type="cover" title="Cover"/>
  </guide>
</package>

OPF schemas and namespaces

The OPF document itself must use the namespace http://www.idpf.org/2007/opf, and the metadata will be in the Dublin Core Metadata Initiative (DCMI) namespace, http://purl.org/dc/elements/1.1/.

This would be a good time to add the OPF and DCMI schema to your XML editor. All the schemas used in EPUB are available from IBM Downloads.

Metadata

Dublin Core defines a set of common metadata terms that you can use to describe a wide variety of digital materials; it's not part of the EPUB specification itself. Any of these terms are allowed in the OPF metadata section. When you build an EPUB for distribution, include as much detail as you can here. Minimal variant is below:

...
<metadata>
  <dc:title>Hello World: My First EPUB</dc:title>
  <dc:creator>My Name</dc:creator>
  <dc:identifier id="bookid">urn:uuid:12345</dc:identifier>
  <meta name="cover" content="cover-image" />
</metadata>
...
The two required terms are title and identifier. According to the EPUB specification, the identifier must be a unique value, although it's up to the digital book creator to define that unique value. For book publishers, this field will typically contain an ISBN or Library of Congress number. For other EPUB creators, consider using a URL or a large, randomly generated unique user ID (UUID). Note that the value of the attribute unique-identifier must match the ID attribute of the dc:identifier element.

Other metadata to consider adding, if it's relevant to your content, include:

See Resources for more information on DCMI.

Including a meta element with the name attribute containing cover is not part of the EPUB specification directly, but is a recommended way to make cover pages and images more portable. Some EPUB renderers prefer to use an image file as the cover, while others will use an XHTML file containing an inlined cover image. This example shows both forms. The value of the meta element's content attribute should be the ID of the book's cover image in the manifest, which is the next part of the OPF file.

Manifest

The OPF manifest lists all the resources found in the EPUB that are part of the content (and excluding metadata). This usually means a list of XHTML files that make up the text of the eBook plus some number of related media such as images. EPUB encourages the use of CSS for styling book content, so CSS files are also included in the manifest. Every file that goes into your digital book must be listed in the manifest.

...
<manifest>
  <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml"/>
  <item id="cover" href="title.html" media-type="application/xhtml+xml"/>
  <item id="content" href="content.html" media-type="application/xhtml+xml"/>
  <item id="cover-image" href="images/cover.png" media-type="image/png"/>
  <item id="css" href="stylesheet.css" media-type="text/css"/>
</manifest>
...


Open Container Format 2.0.1

An EPUB book is distibuted as a ZIP file. The OCF specifies how to organize these files in the ZIP, and defines two additional files that must be included.

The mimetype file must be a text document in ASCII that contains the string application/epub+zip. It must also be uncompressed, unencrypted, and the first file in the ZIP archive. This file provides a more reliable way for applications to identify the mimetype of the file than just the .epub extension.[22]

There must be a folder named META-INF, which contains the required file container.xml. This XML file points to the file defining the contents of the book. This is the OPF file, though additional alternative rootfile elements are allowed.

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 file structure:

--ZIP Container--
mimetype
META-INF/
  container.xml
OEBPS/
  content.opf
  chapter1.xhtml
  ch1-pic.png
  css/
    style.css
    myfont.otf

An example container.xml, given the above file structure:

<?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>

Digital rights management

An EPUB file can optionally contain DRM as an additional layer, but it is not required by the specifications. In addition, the specification does not name any particular DRM system to use, so publishers can choose a DRM scheme to their liking.

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.

When present, DRMed EPUB files must contain a file called rights.xml within the META-INF directory at the root level of the ZIP container.

Validation

An open source tool called epubcheck exists for validating and detecting errors in the structural markup (OPS, OPF, OCF) as well as the XHTML and image files. The tool can be run from the command line, or used in webapps and applications as a library. A large part of the original work on the tool was done at Adobe Systems.[31]

Software reading systems

The following software can read and display EPUB files:

Software License Platform DRM formats supported Notes
Adobe Digital Editions Proprietary Windows, Mac OS X Adobe Content Server Requires online activation for ePub files with DRM.
calibre GPL Windows, Mac OS X, GNU/Linux None Open source. Primarily for library management, conversion, and transferring to devices, it includes a reader. "Calibre: About".
FBReader GPL Windows, GNU/Linux, Android, PDAs None Open source.
Google Books Proprietary Web application, Android, iOS Lektz DRM Supports downloading purchased books as ePub and/or PDF.
Okular GPL Windows, Mac OS X, GNU/Linux ? Open source

Editing systems

Software Platform License Notes
calibre Windows, Mac OS X, GNU/Linux GPL Conversion software and e-book organizer. Allows plugins, including for editing EPUB files; there is for instance a plugin to merge several EPUB files into one.[33]
Sigil Windows, GNU/Linux, Mac OS X GPLv3 This application can also open and edit EPUB books, instead of just converting from other formats to EPUB. Since version 0.7, Sigil supports embedding video or audio in EPUB.
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[Jul 21, 2013] An ePub Tutorial - Spontaneous ∂erivation Wiki

At the moment, whenever I create a Mobipocket book for the Kindle, I start off with creating the ePub version, because things are a bit cleaner that way.

This is a step-by-step tutorial, with example, of making a standards-compliant ePub book by hand.

We’ll be using the public domain (in both illustrations and text) book The Velveteen Rabbit. It has the following good qualifications as a tutorial example:

At the moment, whenever I create a Mobipocket book for the Kindle, I start off with creating the ePub version, because things are a bit cleaner that way.

While there are existing ePub tutorials out there, they’re usually not thorough enough to avoid a lot of *headdesk* moments. Currently the best by far is Harrison Ainsworth’s Epub Format Construction Guide, which is referred to by this tutorial from time to time.

If you want to follow along, here’s the final ePub of this process: the_velveteen_rabbit.epub

Sections

Create rich-layout publications in EPUB 3 with HTML5, CSS3, and MathML

Comparison of e-book formats

Wikipedia
The .epub or OEBPS format is an open standard for e-books created by the International Digital Publishing Forum (IDPF). It combines three IDPF open standards:

The EPUB format has gained some popularity as a vendor-independent XML-based e-book format. The format can be read by the Kobo eReader, Blackberry Playbook, Apple's iBooks app running on iOS devices such as the iPhone, iPod Touch and iPad, Barnes and Noble Nook,

Another other Sony Reader, BeBook, Bookeen Cybook Gen3 (with firmware v. 2 and up), COOL-ER,

Adobe Digital Editions, Lexcycle Stanza, BookGlutton, AZARDI, FBReader, Aldiko, Moon+ Reader and WordPlayer on Android,

Freda on Windows Mobile and Windows Phone 7,

the Mozilla Firefox add-on EPUBReader, and Okular. Several other desktop reader software programs are currently implementing support for the format, such as dotReader, Mobipocket, uBook.

The only notable device lacking integrated support for the ePUB format is the Amazon Kindle, although there has recently been speculation that the Kindle will soon support this format.[4]

Adobe Digital Editions uses .epub format for its e-books, with DRM protection provided through their proprietary ADEPT mechanism. The recently developed ADEPT framework and scripts have been reverse-engineered to circumvent this DRM system.[5]

DSLibris, a Sourceforge.net project, is able to decode e-books in .epub and .xht format for reading on Nintendo DS systems.

The ePUB Format for eBooks - How to Read and Convert ePUB files

This article describes how you can download ebooks in epub format for free, how to read epub ebooks on your desktop or mobile phones and how to convert PDF, Word and other documents into the ePUB ebook format.

epub format ePub is a standard e-book file format that is supported by all popular e-book reading device including the Sony Reader, BeBook, IREX Reader, iPhone and the Nook from Barnes & Noble’s.

Amazon Kindle reader uses a proprietary format (AZW) and cannot read ePub files directly though there are free tools to convert ePub into MOBI (or even PDF) which is a format that your Kindle can read.

Other than hardware devices, you can also read .epub books on your desktop or mobile phone using free e-reader software like Mobipocket, FBReader (for Linux), Aldiko (for Android) or Adobe Digital Editions.

Download Books in ePub Format

If you are looking to download classic titles in ePub format to read offline, the best place is Google Books (select the “public domain only” option).

google books in epubGoogle Books has more than a million public domain (out of copyright) books in the EPUB format that are completely free and they aren’t protected by DRM so you can read these ebook titles on any device / computer without restrictions.

Project Gutenberg and FeedBooks are some other useful sites that offers most of their titles in the EPUF format.

Read ePub e-books inside Firefox

Firefox users can download EPUBReader, a free add-on that lets you read the contents of any ePub book right inside their favorite browser without requiring any special software.

epub reader ePub is basically a zip file that contains a collection of text files and images. This add-on will simply uncompress that zip file and display the contents inside your browser.

In regular course, if you click on a link that points to an ePub file, Firefox will prompt you to to save that file onto the hard-drive but with this add-on installed, the ebook will directly open inside your Firefox tab like any other web page.

Additionally, you can open any ePub file that’s on your desktop using the File -> Open File menu in Firefox. All the ebook are automatically stored in your Firefox profile under a separate sub-directory.

How to Create ePub eBooks

epub editor and converter If you want to publish your own books or blog in ePUB format, the easiest option is that you compose the text in Word (or Google Docs), save it as an RTF file and then you use Amazon’s Stanza program to convert that document into an ePUB ebook.

Before publishing, you should also use the EpubCheck tool from Adobe to make sure that the markup in your ePUB file is valid after conversion.

Alternatively, you may use the free Calibre program to convert virtually any document format into ePUB in a batch. Calibre is available for Linux, Windows and Mac OS X. And for editing ePUB files, you should try Sigil – a WYSIWYG editor that also runs on Windows, Linux and Mac

Download Google Books with Sony Desktop Reader

sony reader for epub While you can download ePUB books directly from the Google Books website, Sony offers an excellent desktop application (for Mac and PC) that is nice integrated with Google Books and you don’t have to own the Sony Reader for using that application.

You can then search public domain titles on Google Books directly from the desktop and save them to your local library in ePUB format.

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