Provides a basic overview of XQuery concepts, and also the expression evaluation (static and dynamic context), atomization, effective Boolean value, XQuery type system, sequence type matching, and error handling.

• 简要介绍了XQuery概念,以及表达式计算(静态和动态上下文)、原子化、有效的布尔值、XQuery类型系统、序列类型匹配和错误处理。