EPUB？规范是数字出版物和文档的分发和交换格式标准。EPUB定义了一种表示、打包和编码结构化和语义增强的Web内容（包括HTML5、CSS、SVG、图像和其他资源）的方法，以便以单个文件格式分发。EPUB 3是该标准的第三个主要版本，由一组四个规范组成，每个规范定义了整个EPUB出版物的一个重要组件:-EPUB Publications 3.0【Publications30】，它定义了EPUB出版物的出版物级语义和总体一致性要求。-EPUB内容文档3.0【ContentDocs30】，它定义了在EPUB出版物的上下文中使用的XHTML、SVG和CSS的配置文件。-EPUB开放容器格式（OCF）3.0【OCF3】，它定义了一种文件格式和处理模型，用于将一组相关资源封装到单个-文件（ZIP）EPUB容器。-EPUB Media Overlays 3.0【MediaOverlays30】，它定义了文本和音频同步的格式和处理模型。EPUB已被广泛采用为数字图书（电子书）的格式，这些新规范显著增加了格式的功能，以便更好地支持更广泛的出版要求，包括复杂的布局、富媒体和交互性以及全局排版功能。预计EPUB 3将用于广泛的内容，包括书籍、杂志以及教育、专业和科学出版物。本文档为希望理解这些规范的内容作者和软件开发人员提供了一个起点。它由非规范性概述材料组成，包括四个建筑的路线图-组成EPUB 3的块规范文档。另一个非规范性文档，EPUB 3从EPUB 2.0.1的变化【EPUB3Changes】，描述了EPUB 3从以前版本的变化，但主要面向从EPUB 2.0.1迁移到EPUB 3的作者和EPUB阅读系统供应商，以及那些预计支持这两个版本的人。

The EPUB？ specification is a distribution and interchange format standard for digital publications and documents. EPUB defines a means of representing, packaging and encoding structured and semantically enhanced Web content — including HTML5, CSS, SVG, images, and other resources — for distribution in a single-file format.

EPUB 3, the third major release of the standard, consists of a set of four specifications, each defining an important component of an overall EPUB Publication:

-EPUB Publications 3.0 [Publications30], which defines publication-level semantics and overarching conformance requirements for EPUB Publications.

-EPUB Content Documents 3.0 [ContentDocs30], which defines profiles of XHTML, SVG and CSS for use in the context of EPUB Publications.

-EPUB Open Container Format (OCF) 3.0 [OCF3], which defines a file format and processing model for encapsulating a set of related resources into a single-file (ZIP) EPUB Container.

-EPUB Media Overlays 3.0 [MediaOverlays30], which defines a format and a processing model for synchronization of text and audio.

EPUB has been widely adopted as the format for digital books (eBooks), and these new specifications significantly increase the format's capabilities in order to better support a wider range of publication requirements, including complex layouts, rich media and interactivity, and global typography features. The expectation is that EPUB 3 will be utilized for a broad range of content, including books, magazines
and educational, professional and scientific publications.

This document provides a starting point for content authors and software developers wishing to
understand these specifications. It consists of non-normative overview material, including a roadmap to
the four building-block specification documents that compose EPUB 3.

Another non-normative document, EPUB 3 Changes from EPUB 2.0.1 [EPUB3Changes], describes
changes in EPUB 3 from the previous version, but is intended primarily for Authors and EPUB Reading
System vendors migrating from EPUB 2.0.1 to EPUB 3 and for those who anticipate supporting both versions.