尽管指定样式通常意味着指定格式并使其标准化，但也可以用它表示内容的结构和含义。

Although generally meant to specify and standardize formatting, a named style can also convey the structure and meaning of the content.

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然后必须将数据库内容读取到对象模型中，并请求底层框架将其内部的结构编组为xml格式。

You would then have to read the contents of the database into your object model and then request the underlying framework to Marshall its internal structure to an XML format.

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当需要格式，内容或者数据结构变化时，你需要指定这是如何执行的。

Whenever there is a need for a change of format, content, or structure of data, you need to specify how this will be performed.

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