任何函数的返回值都是子句(在我们的示例中只有一行)中最后一个表达式的结果。
The return value of any function is the result of the last expression in that clause (in our examples there is only one line).
给定数据库行中的指定列值集合可以在一个或多个同步处理的XPath表达式中引用。
A collection of named column values from a located database row are referenced within one or more synchronously processed XPath expressions.
第一个表达式必须为串联的行值。
The first expression must be the row value that must be concatenated
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