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如前所述,每个查询表达式都是泛型的,以表示表达式计算的值的类型。
As I mentioned earlier, every query expression is generically typed to denote the type of the value the expression evaluates to.
这些元素包含col - spec元素,后者的select属性规定了,对应于xml源文档中当前的行元素,将使用何种表达式来计算每个行值。
These elements contain col-spec elements whose select attribute specifies, relative to the current row element from the XML source, what expressions are used for each row value.
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