EPUB？与印刷书籍或PDF文件不同，文档是为改变而设计的。内容流动或回流以适应 屏幕并适应读者的需要。EPUB 3.0规范说“内容呈现应该 适应用户，而不是用户必须适应内容的特定表示。” 但是这个原则并不适用于所有类型的文档。有时内容和设计是如此交织在一起 他们不能分开。外观的任何变化都有改变意义或失去所有意义的风险。固定布局 文档使内容创建者能够更好地控制演示文稿，而可回流的EPUB则不能 适合内容。 本文档EPUB 3 Fixed-Layout Documents定义了一组元数据属性，以允许声明式 固定的预期渲染行为的表达-在EPUB 3的上下文中布局文档。它还定义了 表达固定布局XHTML和SVG的预期呈现维度的机制[ContentDocs30] 内容以及位图图像。

EPUB？ documents, unlike print books or PDF files, are designed to change. The content flows, or reflows, to fit the screen and to fit the needs of the reader. The EPUB 3.0 Specification says that "content presentation should adapt to the user rather than the user having to adapt to a particular representation of content." But this principle doesn't work for all types of documents. Sometimes content and design are so intertwined they cannot be separated. Any change in appearance risks changing the meaning, or losing all meaning. Fixedlayout documents give content creators greater control over presentation, when a reflowable EPUB is not suitable for the content. This document, EPUB 3 Fixed-Layout Documents, defines a set of metadata properties to allow declarative expression of intended rendering behaviors of fixed-layout documents in the context of EPUB 3. It also defines mechanisms to express the intended rendering dimensions of fixed-layout XHTML and SVG [ContentDocs30] content, as well as bitmap images.