def parse(node, unit = :dxa)
      node.attributes.each do |key, value|
        case key
        when 'top'
          @top = OoxmlSize.new(value.value.to_f, unit)
        when 'left'
          @left = OoxmlSize.new(value.value.to_f, unit)
        when 'right'
          @right = OoxmlSize.new(value.value.to_f, unit)
        when 'bottom'
          @bottom = OoxmlSize.new(value.value.to_f, unit)
        when 'header'
          @header = OoxmlSize.new(value.value.to_f, unit)
        when 'footer'
          @footer = OoxmlSize.new(value.value.to_f, unit)
        when 'gutter'
          @gutter = OoxmlSize.new(value.value.to_f, unit)
        end
      end
      self
    end
def parse(node, unit = :dxa)
      node.attributes.each do |key, value|
        case key
        when 'top'
          @top = OoxmlSize.new(value.value.to_f, unit)
        when 'left'
          @left = OoxmlSize.new(value.value.to_f, unit)
        when 'right'
          @right = OoxmlSize.new(value.value.to_f, unit)
        when 'bottom'
          @bottom = OoxmlSize.new(value.value.to_f, unit)
        when 'header'
          @header = OoxmlSize.new(value.value.to_f, unit)
        when 'footer'
          @footer = OoxmlSize.new(value.value.to_f, unit)
        when 'gutter'
          @gutter = OoxmlSize.new(value.value.to_f, unit)
        end
      end
      self
    end
Parse BordersProperties
 @param [Nokogiri::XML:Element] node with PageMargins
 @return [PageMargins] value of PageMargins