A communiqué from Robin LaFontaine describes the release of Monsell's new 'Delta XML' standalone tools for comparing XML documents and comparing complex data in XML. The 'DeltaXML' range of products "help identify and monitor changes to XML documents and data files. The software compares XML documents and data files and generates a delta file in XML. The delta file can be displayed directly or using XSL style sheets (examples included in the download), or processed for other purposes using standard XML tools. For those using a specific XML format (DTD), DeltaXML DTD can provide an even more intelligent comparison, based on the actual allowed structure of the files. This will produce smaller and more accurate change files and enable handling of data that is not inherently ordered. Applications of DeltaXML include: (1) regression testing of XML software, (2) XML file updates, (3) displaying changes for review and authorization, (4) checking changes made by hand to XML documents and data."
From the web site description: "What DeltaXML is: downloadable software, ready to use immediately. A range of options available, for specific DTDs or for general use. The problem: how to verify that two XML files are the same, or to check what has been changed. But you do not have a tool available to make an intelligent comparison of XML documents and data files. What DeltaXML does: compares two XML files and produces an easy-to-understand, easy-to-use XML output file. You can process the output (delta) file as normal XML, for example using XSL to generate HTML to view in any browser. Delta XML accommodates the latest technologies including XML namespaces..."