You should recognize the first part of the rule extension, because it is almost identical to the category extension previously shown.
您应当识别出规则扩展的第一个部分，这是由于它几乎等同于前面所显示的类别扩展。
Add a new extension to the plug-in as we did for the category.
向插件程序中添加一个新的扩展，就如同我们在类别时所做的那样。
Use extension points and create the category.
使用扩展点并创建类别。
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