为返回一个结果，标量规则只需要记录的当前已评估字段值。
To return a result, scalar rules only require the field values of the record that is currently evaluated.
SHIP3操作符包含一个语句，该语句表明标量子查询的结果放在一个主机变量中。
The SHIP3 operator contains the statement that shows the result of the scalar subquery being bound in as a host variable.
因为这都是些标量函数，所以将为结果集的每一行创建XML数据类型的结果。
Since these are scalars functions, for each line of the result set, a result of the XML data type is created.
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