以文档次序处理其所有子元素的模板确保处理自始至终都沿着源树进行。
A template that processes all of its children in document order ensures that processing occurs all the way down the source tree.
这样即使源树没有变化，也可以手动强制进行下一次安排的构建。
This lets you manually force the next scheduled build to happen even if the source tree hasn't changed.
检查是否可以手工构建源树。
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