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.

youdao

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.

youdao

注意：在调用buildzip函数时，仅需要传递根元素。

Notice that we had to pass only the root element when we invoked the buildZip function.

youdao