要验证XML数据，需要定义一个 XML模式，它指定了可接受的 XML元素、它们的次序和数据类型，等等。
To validate XML data, you need to define an XML schema that specifies acceptable XML elements, their order and data types, and so on.
要验证XML数据，需要定义一个 XML模式，它指定了可接受的 XML元素、它们的次序和数据类型，等等。
To validate XML data, you need to define an XML schema that specifies acceptable XML elements, their order and data types, and so on.
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