清单7定义一个序列名，然后使用一个for子句遍历该序列，获取每个名称并将其添加到节点集合中。

Listing 7 defines a sequence of names, and then USES a for clause to loop through this sequence, retrieving each name and adding it to a node collection.

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它接受作为参数传入的xml列名，然后返回存储在该列中的xml值序列。

It takes the name of an XML column in a as an argument and returns the sequence of XML values stored in that column.

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