Data categories can contain a number of data items, which are linked to the profile items you created earlier on.

数据类别可以包含几个数据项，这些数据项链接到您此前创建的配置项。

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Data categories are like abstract base classes; a category might be able to represent all models of car, for instance.

数据类别类似于抽象基类，比如，一个类别可以表示所有的汽车型号。

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In fact, these data categories are the real thing, and the hierarchy inside each profile is a virtual copy of the same structure.

实际上，这些数据类别是真实的，而配置文件中的结构则是这个结构的虚拟副本。

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Inside each sphere or square are more spheres or squares, subdividing data into finer categories.

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Retail sales data excludes volatile categories like autos, gas and building materials and includes discretionary purchases such as electronics, furniture and apparel.

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But it warned ministers would be able to demand "potentially limitless categories of data" unless the draft bill was amended.

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