重定义和 include 很相似，但是如名称所暗示的，它允许重定义简单类型、复杂类型、元素组和属性组。
Redefine works much like include, but, as its name indicates, it allows you to redefine simple types, complex types, element groups, and attribute groups.
TABLE ONLY选项允许指定数据重分发期间将被重分发的一组表。
The table ONLY option allows you to specify a list of tables that will be redistributed during the data redistribution.
$_SERVER序列变量包含了服务器端变量，允许程序员重定义Accept HTTP头信息。
The $_SERVER array contains the server variables, allowing us to interrogate the Accept HTTP header.
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