业务对象中的对应字段将自动设置为空。
The corresponding field in the business object is automatically set to null.
如果不存在,它会将线程静态Stack字段设置为空。
If there aren't, it sets the thread-static Stack field to null.
如果该设置为空,那么使用将要写入的dom流的编码属性。
If that is null, then the encoding attribute of the DOM stream to be written is used.
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