成功遍历xml树之后，该函数就用PHP关联数组转换和存储了所有的XML元素(根元素和所有的孩子元素)。

At the end of a successful XML tree walk, this function will convert and store all the XML elements (the root element and all the child elements) in a PHP associative array.

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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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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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