包含该类的标签其他属性的所有值与以前相同，除了服务器为窗口的对象ID添加的ID属性。

All of the values of other attributes of the tag containing this class are the same as before, except the ID attribute that is added by server for the object ID of the window.

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在一个类中可以添加一个集合以管理该类使用的对象组。

You can add a collection to one of your classes to manage groups of objects your class uses.

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