def schema
      UrlScraper::TYPES.each_pair do |schema, types|
        return schema if types.include?(self.type)
      end
      nil
    end
def schema
      UrlScraper::TYPES.each_pair do |schema, types|
        return schema if types.include?(self.type)
      end
      nil
    end
The schema under which this particular object lies. May be any of
 the keys of the TYPES constant.