Class SieveCatalogError

              object --+                
                       |                
exceptions.BaseException --+            
                           |            
        exceptions.Exception --+        
                               |        
                     PologyError --+    
                                   |    
                          SieveError --+
                                       |
                                      SieveCatalogError

Exception for single catalogs.

If sieve's process or process_header method throw it, client is not allowed to send other messages from the same catalog to the sieve, but can send messages from other catalogs.