XML allows you to use something called namespaces and schemas, which let you predefine the expected structure of a particular named element in the file.

XML允许使用名称空间，允许对文件中特定的元素的期望结构进行预定义。

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If we predefine the organizational structure of a machine, we predefine what problems it can solve.

如果我们预先确定了一台机器的组织结构，也就预先确定了它能解决怎样的问题。

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I predefine the risk of every trade.

每笔交易前，我提前衡量风险。

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