R: convert XML data to data frame

Question

For a homework assignment I am attempting to convert an XML file into a data frame in R. I have tried many different things, and I have searched for ideas on the internet bu

Answer 1

For me the canonical answer is

doc<-xmlParse("Olive_py.xml")
xmldf <- xmlToDataFrame(nodes = getNodeSet(doc, "//record"))

which is somehow hidden in @Parfait's answer.

However, this will fail if some of the nodes have multiple child nodes of the same type. In such cases an extractor function will solve the problem:

example data

    
        
            
ispsum ..
        
    
    
        
            

        
        
    

code

require(XML)
require(tidyr)
require(dplyr)

node2df <- function(node){
    # (Optinonally) read out properties of  some optional child node
    outputNodes = getNodeSet(node, "output")
    stdout = if (length(outputNodes) > 0) xmlValue(outputNodes[[1]]) else NA

    vec_as_df <- function(namedVec, row_name="name", value_name="value"){
        data_frame(name = names(namedVec), value = namedVec) %>% set_names(row_name, value_name)
    }

    # Extract all node properties
    node %>%
        xmlAttrs %>%
        vec_as_df %>%
        pivot_wider(names_from = name, values_from = value) %>%
        mutate(stdout = stdout)
}

testResults = xmlParse(xmlFile) %>%
    getNodeSet("/testrun/suite/test", fun = node2df) %>%
    bind_rows()