Other than those modules already mentioned by fellow monks, you also can find other modules, for SAX, and DOM.

After all, there are two types of modules, either SAX like, which allow you to handle XML content on fly, but does not keep history in memory (Well, you can do it for yourself, but I mean the module does not do it for you); or DOM like, which grab the whole XML, and save in some data structure for you to handle. Depends on your need, you can choose one type.