def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'style'
          @style_number = node_child.attribute('val').value.to_i
        when 'oleObject'
          @ole_object = OleObject.new(parent: self).parse(node_child)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'style'
          @style_number = node_child.attribute('val').value.to_i
        when 'oleObject'
          @ole_object = OleObject.new(parent: self).parse(node_child)
        end
      end
      self
    end
Parse ChartStyle
 @param [Nokogiri::XML:Node] node with Relationships
 @return [ChartStyle] result of parsing