A FLWOR expression is much like a SELECT-FROM-WHERE expression in SQL: it is used to iterate through a list of items and to optionally return something that is computed from each item.
FL WOR表达式非常像SQL中的SELECT - FROM - WHERE表达式——它用于对由多项组成的一个列表进行迭代，并且可以选择返回通过在每一项上进行计算得到的值。
Like most SQL statements, this example follows the standard SQL syntax of SELECT column (s)... FROM table (s)... WHERE condition (s).
跟大多数sql语句一样，本例遵循SELECT column (s) . FROM table (s)。
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