def parse(node)
      node.xpath('*').each do |column_node|
        case column_node.name
        when 'table'
          @table = X14Table.new(parent: self).parse(column_node)
        when 'sparklineGroups'
          @sparkline_groups = SparklineGroups.new(parent: self).parse(column_node)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |column_node|
        case column_node.name
        when 'table'
          @table = X14Table.new(parent: self).parse(column_node)
        when 'sparklineGroups'
          @sparkline_groups = SparklineGroups.new(parent: self).parse(column_node)
        end
      end
      self
    end
Parse Extension data
 @param [Nokogiri::XML:Element] node with Extension data
 @return [Extension] value of Extension data