1. In a computer system, a method, comprising, accessing a first file of hierarchically structured data to provide a first tree structure therefrom; accessing a second file of hierarchically structured data to provide a second tree structure therefrom; developing a link tree based on a comparison of the first and second tree structures, the link tree relating the first tree structure to the second tree structure; and processing the link tree to output a set of at least one difference between the first file and the second file.