转义序列不是标记扩展，不受类的支持。
The escape sequence is not a markup extension and is not backed by a class.
即正好位于指示序列化对象开始的开始标记之前。
That is, just before the start tag that indicates the beginning of a serialized object.
即正好位于指示序列化对象开始的开始标记之前。
That is, just before the start tag that indicates the beginning of a serialized object.
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