如果用户决定这样做，当树构造完成时可以再回来访问这些部分。
If the user chooses to do so, he can cycle back and access those parts again as if the tree was completely built.
如果没有完成上述过程，可以在本文结束部分下载Order . xsd文件，并使用它创建输出类型树。
Download the Order.xsd file at the bottom of the article if you have not already done so and use it to create the output type tree.
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