Context-driven RFID tag and system content

1. A method for tracking an item having an associated radio frequency identification (RFID) tag, comprising:

performing a first read of the tag with a RFID communication device to determine a first value for a physical attribute of the item;

performing a second read of the tag with the RFID communication device to determine a second value for the physical attribute of the item;

detecting a change based on whether the first value is different from the second value; and

updating a first information stored in the tag based on the detected change with the RFID communication device.

2. The method of claim 1 , further comprising:

updating a second information stored in a database based on the detected change.

3. The method of claim 1 , wherein the physical attribute is a location of the item, wherein said detecting comprises:

detecting a change in the location of the item using a position sensor.

4. The method of claim 3 , wherein said detecting a change in the location of the item comprises:

performing a first read of the tag by a first reader having a first location; and

performing a second read of the tag by a second reader having a second location.

5. The method of claim 3 , wherein said detecting a change in the location of the item comprises:

detecting a change in the location of the item using a position sensor within a building.

6. The method of claim 3 , wherein said detecting a change in the location of the item comprises:

detecting a change in a height at which the item is located using a position sensor.

7. The method of claim 3 , wherein the first information comprises a price of the item, wherein said updating the first information stored in the tag based on the detected change in the location of the item comprises:

changing the price information stored in the tag based on the detected change.

8. The method of claim 1 , wherein the physical attribute is a temperature of the item, wherein said detecting comprises:

detecting a change in the temperature of the item.

9. The method of claim 1 , wherein the physical attribute is a velocity of movement of the item, wherein said detecting comprises:

detecting a change in the velocity of movement of the item.

10. The method of claim 8 , wherein the first information comprises velocity information of the item, wherein said updating the first information stored in the tag based on the detected change comprises:

storing a velocity of the item in the tag.

11. The method of claim 1 , wherein the first information comprises a price of the item, wherein said updating the first information stored in the tag based on the detected change comprises:

updating the price stored in the tag with an updated price.

12. The method of claim 1 , wherein the first information comprises location information of the item, wherein said updating the first information stored in the tag based on the detected change comprises:

updating the location information stored in the tag with a current location of the item.

13. The method of claim 1 , wherein said updating comprises:

selecting an information element from a plurality of information elements stored in the tag based on the detected change; and

replacing the first information with the selected information element.

14. The method of claim 13 , further comprising:

displaying the selected information element.

15. A system for tracking an item having an associated radio frequency identification (RFID) tag, comprising:

a RFID communication device performing a first read of the tag to determine a first value for a physical attribute of the item and performing a second read of the tag to determine a second value for the physical attribute of the item; and

a monitor system coupled to the RFID communication system for detecting a change based on whether the first value is different from the second value,

wherein the RFID communication device is configured to update a first information stored in the tag based on the detected change.

16. The system of claim 15 , further comprising:

a network communication device coupled to the monitor module and configured to update a second information stored in a database based on the detected change.

17. The system of claim 16 , wherein the network communication device is coupled to the database over a communications network.

18. The system of claim 15 , wherein the physical attribute is a location of the item.

19. The system of claim 18 , wherein the monitor system comprises a RFID reader.

20. The system of claim 19 , wherein the reader configured to detect a change in location of the item using a position sensor by reading the RFID tag.

21. The system of claim 19 , wherein the monitor system comprises a first reader located at a first location and a second reader located at a second location, wherein the first reader and second reader are each configured to transmit read signals directed to the RFID tag to cooperatively determine the location of the item.

22. The system of claim 15 , wherein the physical attribute is a temperature of the item, wherein the monitor system comprises a temperature sensor.

23. The system of claim 15 , wherein the physical attribute is a velocity of the item, wherein the monitor system comprises a velocity sensor.

24. The system of claim 15 , wherein the RFID communication device is a tag data writer configured to transmit updated information to the RFID tag to replace the first information stored in the RFID tag.

25. The system of claim 15 , wherein the RFID communication device is configured to transmit a command to the RFED tag to replace the first information stored in the RFID tag with a second information stored in the RFID tag.