A new IE7 module (
ie7-xml-extras.js) provides an emulation of Mozilla’s XML objects:
This new module provides wrappers for the underlying ActiveX objects. This is a slightly heavy handed way to implement cross-browser support and more lightweight solutions have been around for a while. But if you are a purist, then you may want to download the code. Although the module is part of IE7 it will also work as a standalone module.