def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'orient'
          @orientation = value.value.to_sym
        when 'h'
          @height = OoxmlSize.new(value.value.to_f)
        when 'w'
          @width = OoxmlSize.new(value.value.to_f)
        end
      end
      self
    end
def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'orient'
          @orientation = value.value.to_sym
        when 'h'
          @height = OoxmlSize.new(value.value.to_f)
        when 'w'
          @width = OoxmlSize.new(value.value.to_f)
        end
      end
      self
    end
Parse PageSize
 @param [Nokogiri::XML:Element] node with PageSize
 @return [PageSize] value of Size