15. The computer program product of claim 13 , wherein the identifying the candidate field includes identifying a label or name previously used to obtain information from the web site and not corresponding to the candidate field.
15. The computer program product of claim 13 , wherein the identifying the candidate field includes identifying a label or name previously used to obtain information from the web site and not corresponding to the candidate field. 16. The computer program product of claim 15 , wherein the identifying the candidate field includes evaluating a location of the candidate field relative to locations of other information on the second version of the web page with the first version of the web page containing the first unsuccessfully retrieved field.