[R] how to install rattle for data mining

[chinna]

 library(rattle)
Loading required package: pmml
Loading required package: XML
Error: package 'XML' could not be loaded
In addition: Warning message:
In library(pkg, character.only = TRUE, logical.return = TRUE, lib.loc =
lib.loc) :
  there is no package called 'XML'



i have installed glade package 

>install.packages("RGtk2")
> install.packages("rattle")
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