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How to filter xml value in R?

3 messages · Manish Gupta, Ben Tupper

Manish Gupta
# 
Hi,

I have one xml file. 

<Class>
     <Node1 code ="1"> First node </Node1>
     <Node2 code ="1"> Second node </Node2>
     <Node3 code ="1"> Third node </Node3>
    <Node1 code ="2"> Fourth node </Node1>
</Class>

for (i in 1:xmlSize())
{
     print(Class[i])   # how can i filter Node1 ?
}

by using xmlChildren(Class), i get nodes of Class. How can i filter Node1
and print other elements of Class node?

Regards





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Ben Tupper
# 
Hi,
On Nov 13, 2012, at 11:55 PM, Manish Gupta wrote:

            

      
      
      
    

        
I think the XML functions "[" and "[[" are what you are looking for.  These operate like the xmlChildren function does.  You needn't loop through looking for the match - instead, just subscript by the node name. 

txt <- "<Class> <Node1 code =\"1\"> First node </Node1> <Node2 code =\"1\"> Second node </Node2> <Node3 code =\"1\"> Third node </Node3> <Node1 code =\"2\"> Fourth node </Node1> </Class>"

node0 <- xmlRoot( xmlTreeParse(txt, useInternalNodes = TRUE) )

node1 <- node0[["Node1"]]