The most powerful new feature in XQuery is the FLWR expression.

XQuery中最强大的新特性是FLWR表达式。

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Each FLWR expression has one or more for clause, one or more let clause, an optional where clause, and a return clause.

每个FLWR表达式都有一个或多个for子句、一个或多个let子句、一个可选的where子句以及一个return子句。

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According to the FLWR expression characteristics, the algorithm is divided into three parts: decomposing the LET and FOR clause, handling RETURN clause and WHERE condition.

根据FLWR表达式的特点，算法共分为三个部分：分解FOR和LET子句、处理RETURN子句和处理WHERE条件。

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