Class SAXReaderNotAvailable

              object --+                
                       |                
exceptions.BaseException --+            
                           |            
        exceptions.Exception --+        
                               |        
                    SAXException --+    
                                   |    
            SAXNotSupportedException --+
                                       |
                                      SAXReaderNotAvailable

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.