def write_cell_value(value = '') #:nodoc:
      value ||= ''
      value = value.to_i if value == value.to_i
      @writer.data_element('v', value)
    end
def write_cell_value(value = '') #:nodoc:
      value ||= ''
      value = value.to_i if value == value.to_i
      @writer.data_element('v', value)
    end
Write the cell value <v> element.