Describes XQuery primary expressions, path expressions, sequence expressions, arithmetic comparison and logical expressions, XQuery construction, FLWOR expression, conditional and quantified expressions, and various expressions on sequence types.

• 介绍XQuery主表达式、路径表达式、序列表达式、算术比较和逻辑表达式、XQuery构造、FLWOR表达式、条件和定量表达式以及序列类型的各种表达式。