def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'cTn'
          @common_time_node = CommonTiming.new(parent: self).parse(node_child)
        when 'prevCondLst'
          @previous_conditions_list = ConditionList.new(parent: self).parse(node_child)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'cTn'
          @common_time_node = CommonTiming.new(parent: self).parse(node_child)
        when 'prevCondLst'
          @previous_conditions_list = ConditionList.new(parent: self).parse(node_child)
        end
      end
      self
    end
Parse TimeNode
 @param node [Nokogiri::XML::Element] node to parse
 @return [TimeNode] value of SheetFormatProperties