XPath Detailed summary
https://www.cnblogs.com/sthu/p/8319072.html
XPath syntax
http://www.w3school.com.cn/xpath/xpath_syntax.asp
XPath Detailed summary
https://www.cnblogs.com/sthu/p/8319072.html
XPath syntax
http://www.w3school.com.cn/xpath/xpath_syntax.asp