To define the structure of an XML document, as well as its element relationships, data types, and content constraints, you use a document type definition (DTD) or schema.是什么意思_To define the structure of an XML document, as well as its element relationships, data types, and content constraints, you use a document type definition (DTD) or schema.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句