5. The method of claim 1 , wherein the determining operation comprises: evaluating the plurality of wrappers to determine whether the path associated with each wrapper leads to the data item in the document when the document is changed in accordance with the plurality of different change operations; based on a result from the evaluating operation and the probability values associated with the plurality of different change operations, determining a success/failure probability for each one of the wrappers.
5. The method of claim 1 , wherein the determining operation comprises: evaluating the plurality of wrappers to determine whether the path associated with each wrapper leads to the data item in the document when the document is changed in accordance with the plurality of different change operations; based on a result from the evaluating operation and the probability values associated with the plurality of different change operations, determining a success/failure probability for each one of the wrappers. 6. The method of claim 5 , wherein the providing operation is based on comparing the success/failure probabilities of the plurality of wrappers.