XML Output file

Hey All,

I am using the XML R package to read in an XML file of the following format:

12:00:00.01
25.02

12:00:00.02
15

12:00:01.025
15.02

12:00:01.031
18.25

The code of the XML is being cut the first number is called timeStamp (i.e. 12:00:01.031), the second number is called Price (i.e. 18.25)
I am then carrying out basic statistics on the data. I would like to create a new XML file containg the original data and add tags for things like the mean, median, standard deviation etc… any idea on how this is best achieved?

Any help greatly appreciated.