1.3.1 introduced the FileTransformer to allow on-the-fly transforming of data.
For XML files it makes sense to use XMLFilters and create an XMLReader. This can throw a SAXException, which is a checked exception, which shouldn't be rethrown as an IOException.
Better to introduce a new Exception to handle this case properly.
Assuming this class isn't used anywhere yet, it should be good to introduce it asap.