MediateV.S EventHandler

最近看了一些wiz框架的例子，发现Mediate这个标签用的比较多，只知道它的做用跟EventHandler是同样的，可是二者有什么区别，实在是没搞明白。原觉得这个标签功能更强悍，上网google了一把，才知道在SWIZ1.0以后更偏向用EventHandler，由于Mediate会让人感到有些疑惑，并且不能很好的描述这个标签的意图，用EventHandler就明朗多了.如下是原话：

Mediate will continue to work since it has been around for so long, but it
is being deprecated in favor of the [EventHandler] metadata tag. We decided
that Mediate was just confusing and didn't describe the intent of the tag
very well. EventHandler makes it more obvious what the tag is doing.