Microsoft XML Diff and Patch is a set of tools for comparison of two XML documents and application of the changes (patching). XML Diff detects addition, deletion and other changes between two XML documents. It also detects structural changes like a move of a XML subtree. It produces Xml Diff Language Diffgram (XDL diffgram or just diffgram) that describes the differences between the two XML documents. The diffgram can be then used to display these differences or to perform a patch operation using the XML Patch tool.

This sample application demonstrates how the XML Diff and Patch tool can be used to compare XML documents programmatically.