If the base table on which the view is defined contains not just an XML column but also relational columns with indexes, you should include those relational columns in the view definition.
如果定义视图所用的基表不仅包含一个xml列，还包含有索引的关系列，那么应该将那些关系列包含在视图定义中。
XMLTABLE: a new SQL function which is designed to view some portion of an XML document as a relational table.
XMLTABLE：这个新的SQL函数用来以关系表的形式查看XML文档的某一部分。
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