def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'id'
          @id = value.value.to_i
        when 'name'
          @name = value.value
        end
      end
      self
    end
def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'id'
          @id = value.value.to_i
        when 'name'
          @name = value.value
        end
      end
      self
    end
Parse BookmarkStart object
 @param node [Nokogiri::XML:Element] node to parse
 @return [BookmarkStart] result of parsing