gistfile1.rb

require 'rubygems'
require 'faster_csv'


FasterCSV.foreach('areas.csv', :headers => true, :col_sep => ';') do |row|  
  from = "<ID_CENTRO_TRABAJO>#{row['ID_CENTRO_TRABAJO']}</ID_CENTRO_TRABAJO>"
  to = "<ID_CENTRO_TRABAJO>#{row['INTRANET']}</ID_CENTRO_TRABAJO>"
  
  File.open('fixed.xml').each_line { |line| puts line.gsub(from, to) }  
end

fixed_xml.close