def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'amt'
          @amount = OoxmlSize.new(value.value.to_f, :one_1000th_percent)
        end
      end
      self
    end
def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'amt'
          @amount = OoxmlSize.new(value.value.to_f, :one_1000th_percent)
        end
      end
      self
    end
Parse AlphaModFix object
 @param node [Nokogiri::XML:Element] node to parse
 @return [AlphaModFix] result of parsing