def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'tnLst'
          @time_node_list = TimeNode.parse_list(node_child)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'tnLst'
          @time_node_list = TimeNode.parse_list(node_child)
        end
      end
      self
    end
Parse Timing object
 @param node [Nokogiri::XML:Element] node to parse
 @return [Timing] result of parsing