The key is the stylesheet processing instruction (PI) in the second line.
关键是第二行中的样式表处理指令（PI）。
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Listing 2 is the stylesheet.
清单2是样式表。
Listing 4 is the stylesheet itself.
清单4是样式表本身。
Key to the data transformation is the Extensible Stylesheet Language, which provides information to identify what type of device is requesting information and what kind of network it is running on.
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