The process of validation checks the XML against a Document Type Definition (DTD), which may be part of the XML or external to it.
确认过程根据文档类型定义(DTD)来检查XML, DTD可以是XML的一部分，也可以在它的外部。
The mathematical definition of the transform function guarantees that this process will produce the exact same document state on both server and client.
Transform函数的数学定义确保这一过程将使服务器和客户端产生完全相同文档状态。
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