How do i find all nodes without children (starting from non-root node!) in xpath/R?

问题

I know how to find all nodes that dont have a child node:

library(rvest)
library(magrittr)

doc <- "https://www.r-bloggers.com/" %>% GET %>% content
leafes <- doc %>% html_nodes(xpath = "//*[not(descendant::*)]")
length(leafes)    

Now i try the same from nodes that are not the root node:

doc <- "https://www.r-bloggers.com/" %>% GET %>% content
tags <- doc %>% html_nodes(xpath = "/html/body/div/div/div/div/h2/a")
nonRootNodeWithChildr <- tags %>% html_nodes(xpath = "..") %>% html_nodes(xpath = "..")
nonRootNodeWithChildr %>% html_nodes(xpath = "*[not(descendant::*)]")

I assume that i have to go for *[] instead of //* to avoid starting at document root, however, "//" would assure i can also go for the Grand++ children.

回答1:

I think

nonRootNodeWithChildr %>% html_nodes(xpath = ".//*[not(descendant::*)]")

could be what i was looking for.

来源：https://stackoverflow.com/questions/60352392/how-do-i-find-all-nodes-without-children-starting-from-non-root-node-in-xpath