An XHTML document is validated against a Document Type Definition.

依靠文档类型定义来校验XHTML文档.

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An HTML document is validated against a Document Type Definition ( DTD ).

HTML文档依靠 DTD 来校验文档是否有效.

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Sets or clears the Mail Merge document type.

设置或清除“邮件合并”文档格式.

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Document Type Definition ( DTD ) should be defined before building Coal Spatial Information System based on XML.

要建立基于XML的煤矿空间信息系统,首先要定义它的文档类型定义 ( DocumentTypeDefinition,DTD ).

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Document Type Definition ( DTD ) should be defined before building Urban Geographic Information System based on XML.

要建立基于XML的城市地理信息系统,首先要定义它的文档类型定义 ( DocumentTypeDefinition,DTD ).

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