document type specification的意思|示意

Select the appropriate document type (use case specification in this case), and click OK (see Figure 8. Branching - Import document 3).

选择合适的文件类型(在本例中，是用例规约)并点击OK(参见图8，“分支—导入文件3”)。

The specification also treats every part of the document as a node, consisting of a type and a value.

该规范同样将文档的每个部分看成由类型和值组成的节点。

For the sake of brevity, most of the examples in this specification do not begin with the document type declaration that is mandatory at the beginning of each HTML document.

为了保持简洁，尽管HTML DTD要求每个文档都要以文档类型声明开头，本规范绝大部分的例子都没有对文档类型声明进行了省略。

The specification also treats every part of the document as a node consisting of a type and a value.

此规范还将文档的每一部分当成由一个类型和一个值组成的节点来对待。

It's interesting to note that in the XSL specification, the W3C didn't include an official DTD (document Type Definition) that you could use to validate an FO document.

有趣的是，在XSL规范中，W3C没有包含一个可用来验证fo文档的正式认可的DTD(文档类型定义)。

The ability to validate XML, or ensure that it satisfies some restriction based on type, is inherent in the language itself; Document Type Definitions are part of the XML specification.

验证 XML 或确保满足基于类型的某些限制是语言自身所固有的能力；Document Type Definitions 是 XML 规范的一部分。