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。
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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