# File lib/amazon/search/marketplace.rb, line 135
        def listing_search(listing_id, heavy=HEAVY)
          url = "/onca/xml3?t=%s&MarketplaceSearch=listing-id&f=xml&type=%s" +
                "&dev-t=%s&listing-id=%s"
          type = heavy ? 'heavy' : 'lite'

          search(url % [@id, type, @token, listing_id])
        end