| Wraps {@link SAXException} and make it an unchecked exception.
Xerces XNI doesn't allow {@link SAXException} to be thrown.
So when the user-supplied error handler throws it,
it needs to be tunneled through Xerces.
It is a bug if this exception "leaks" to the application.
FIXME: use XNIException for this purpose. It's already doing this
kind of SAXException tunneling. | 