def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'val'
          @value = value.value.to_sym
        when 'color'
          @color = value.value.to_sym
        when 'fill'
          @fill = Color.new(parent: self).parse_hex_string(value.value.to_s)
        end
      end
      self
    end
def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'val'
          @value = value.value.to_sym
        when 'color'
          @color = value.value.to_sym
        when 'fill'
          @fill = Color.new(parent: self).parse_hex_string(value.value.to_s)
        end
      end
      self
    end
Parse Shade
 @param [Nokogiri::XML:Node] node with Shade
 @return [Shade] result of parsing