def parse(node)
      node.xpath('*').each do |reference_child|
        case reference_child.name
        when 'f'
          @formula = reference_child.text
        when 'strCache', 'numCache'
          @cache = NumberStringCache.new(parent: self).parse(reference_child)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |reference_child|
        case reference_child.name
        when 'f'
          @formula = reference_child.text
        when 'strCache', 'numCache'
          @cache = NumberStringCache.new(parent: self).parse(reference_child)
        end
      end
      self
    end
Parse Order
 @param [Nokogiri::XML:Node] node with Order
 @return [Order] result of parsing