用Xpath刷选出节点为空的节点

Xpath刷选出节点

以下xml为例

<AccountBook>
 <Meals Total="2 />
 <Clothes>hello</Clothes>
 <HouseRent></HouseRent>
</AccountBook>

选出属性为Total的节点的Xpath：

//AccountBook/Meals[@Total="2"]

选出Clothes节点值为hello的Xpath：

//AccountBook/Clothes[text()="hello"]

选出HouseRent节点值为空的Xpath：

//AccountBook/HouseRent[not(text())]

或者是：

//AccountBook/HouseRent[not(node())]