如何通過xPath從XML元素獲取子字符串？

Question

源XML：

<?xml version="1.0" encoding="UTF-8"?> 
<ServerAnswer> 
    <Booking Data="AABB150908"/> 
    <Booking Data="AABB150907"/> 
</ServerAnswer> 

我的XPath：

//Booking/@Data[substring(//Booking/@Data,4,6)] 

如果我查詢了XPath通過http://www.xpathtester.com/xpath我只得到完整的數據。我怎樣才能得到數據中給定的日期？

Answer 1

Xpath的從1計數，而不是從0

substring(//Booking/@Data,5,6)