xmlrow输出是一个表示为xml的行值的序列，xmlgroup函数将所有值集合到一个根节点下。

While the xmlrow output is the sequence of the row values represented as XML, the xmlgroup function groups all the values under a root node.

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根的函数不依赖于任何模型对象，并且gef为根提供了几个现成的实现。

Note that the root's functions are not dependent on any model object and that GEF provides several ready-to-use implementations for roots.

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由于根文件系统是磁盘上的一个文件系统，因此initrd函数会提供一种启动方法来获得对磁盘的访问，并挂载真正的根文件系统。

Because the root file system is a file system on a disk, the initrd function provides a means of bootstrapping to gain access to the disk and mount the real root file system.

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