18. The computer readable medium of claim 15 , wherein determining includes evaluating the plurality of wrappers to determine whether the path associated with each wrapper leads to the data item in the representation of the document when the document is changed according to various different change operations.
18. The computer readable medium of claim 15 , wherein determining includes evaluating the plurality of wrappers to determine whether the path associated with each wrapper leads to the data item in the representation of the document when the document is changed according to various different change operations. 19. The computer readable medium of claim 18 , wherein each of the various different change operations has associated therewith a probability of application of the associated one of the different change operations to the document.