def remove_control_chars(src, dest)
      inpath = File.expand_path(src)
      outpath = File.expand_path(dest)
      `cat #{inpath} | tr -d "\\000-\\010\\013\\014\\016-\\037" > #{outpath}`
    end
def remove_control_chars(src, dest)
      inpath = File.expand_path(src)
      outpath = File.expand_path(dest)
      `cat #{inpath} | tr -d "\\000-\\010\\013\\014\\016-\\037" > #{outpath}`
    end
XML files shouldn't contain low ASCII control chars. Strip them.