本规范EPUB Media Overlays 3.0定义了[SMIL]（同步多媒体）的用法 集成语言）、软件包文档、EPUB？样式表和EPUB内容 用于表示与EPUB内容文档同步的音频的文档。 本规范是构成EPUB 3的一系列相关规范之一，EPUB 3是第三大规范 修订基于XML和Web标准的数字出版物交换和交付格式。信息技术 应与构成EPUB 3的其他规范一起阅读和理解: ·EPUB 3概述[EPUB3概述]，提供EPUB和 EPUB 3文档其余部分的路线图。首先应该阅读概述。 ·EPUB Publications 3.0[Publications30]，定义了发布级语义和 EPUB出版物的总体合规性要求。 ·EPUB Content Documents 3.0[ContentDocs30]，它定义了XHTML、SVG和CSS的配置文件 供EPUB出版物中使用。 ·EPUB Open Container Format（OCF）3.0[OCF3]，它定义了文件格式和处理 用于将一组相关资源封装到单个文件（ZIP）EPUB容器中的模型。

This specification, EPUB Media Overlays 3.0, defines a usage of [SMIL] (Synchronized Multimedia Integration Language), the Package Document, the EPUB？ Style Sheet, and the EPUB Content Document for representation of audio synchronized with the EPUB Content Document. This specification is one of a family of related specifications that compose EPUB 3, the third major revision of an interchange and delivery format for digital publications based on XML and Web Standards. It is meant to be read and understood in concert with the other specifications that make up EPUB 3: · The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and a roadmap to the rest of the EPUB 3 documents. The Overview should be read first. · 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.