Exception class for a missing driver.
An XMLReader module (driver) should raise this exception when it is first imported, e.g. when a support module cannot be imported. It also may be raised during parsing, e.g. if executing an external program is not permitted.
There are no attributes in this class.
getException()
Return the embedded exception, or None if there was none.
getMessage()
Return a message for this exception.
There are no known subclasses.