Notice the document type declaration, which is used to load a DTD, which contains any strings that should be localized (basically any natural language strings presented to the user).

请注意文档类型声明，它用于加载一个 DTD，其中包含所有应进行本地化的字符串（基本上包括呈现给用户的所有自然语言字符串）。

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These rules are stored in a separate document called a document Type Declaration (DTD), and are utilized to validate the accuracy of the XHTML document structure.

这些规则存储在一个称为“文档类型声明(Document Type Declaration (DTD))”的单独文档中，并且使用这些规则验证XHTML文档结构的准确性。

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This method is particularly useful when processing element-only content (that is, elements declared as EMTPY in the Document Type Declaration, or DTD).

该方法在处理纯元素(即文档类型声明DTD中声明为EMPTY的元素)内容时尤其有用。

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