Like the timeline approach, this one shows multiple states of the same location. The difference is that the before-and-after method shows only two states.
时间轴的方法显示了同一地区的多种状态，而过去和未来的方法与其区别在于只显示同一地区的两种状态。
This method tells you all information you need to know: whether one node is descendant of an ancestor of the other, whether it is before or after, and so on.
这个方法告诉您所有想知道的信息：一个节点是否是另一个节点的祖先的后代，它是在前面还是后面呢，等等。
My application requires three kinds of notification: set attribute value, before method invocation, and after method invocation.
这个应用程序需要三种通知：设置属性值、方法调用之前以及方法调用之后。
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