返回类型可以是4 种XPath 1.0基本数据类型之一：boolean、字符串、节点集和数字。
The return type can be any one of the four basic XPath 1.0 data types: boolean, string, node set, and number.
返回类型可以是4 种XPath 1.0基本数据类型之一：boolean、字符串、节点集和数字。
The return type can be any one of the four basic XPath 1.0 data types: boolean, string, node set, and number.
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