Meaningful Xml Diffs with SWI-Prolog
Introduction Building on the previous article I wrote on using the SWI Prolog Xpath predicate for analyzing Xml Node Set relationships, I now describe a way to produce a tree oriented diff based on similar techniques. The goal of such a diff is to identify objects of 2 Xml trees which differ by a given sub-node. In a sense is that diff not a fully general diff, as it focuses on 2 or 3 levels: object sub-or-descendant node resp. property when required, property of the sub-or-descendant node specified by the user, within the Xml tree structure. Another important goal of this diff is to be able to accommodate a different ordering of these objects in the Xml structure, which is normally a constraint which most editors or developer tools can’t cope with. In the following sections I will again use a similar fictitious tree example as in the precedent article. Resources for this article Prolog source code and XML examples are available on [github] ...