
| Amazon       | tuple   | book author, title, price, availability, isbn               |
|--------------|---------|-------------------------------------------------------------|
| arrowlist    | list    | part number, manufacturer, price, status, description, url  |
| Bigbook      | tuple   | business name, address, city, state, phone                  |
| Barnes&Noble | tuple   | book author, title, price, availability, isbn               |
| borders      | list    | book author, title, price, availability                     |
| cuisinenet   | list    | restaurant name, cuisine, address, city, state, phone, link |
| geocoder     | tuple   | latitude, longitude, street, city, state                    |
| Quote        | tuple   | stock ticker, price, pricechange, volume                    |
| whitepages   | list    | business name, address, city, state, phone                  |
| Y ahoo Quote | tuple   | stock ticker, price, pricechange, volume                    |
| cia factbook | tuple   | country area, borders, population, etc.                     |

Table 5: List of sources used in the experiments and data fields **extracted from them. Source**
type refers to how much data a source returns in response to a query - a single tuple or a list of tuples. For airport **source, the type changed from a single tuple**
to a list over time.