_exceptions: Format a missing system id as <unknown>.
expatreader: Use the error handler instead of raising exception directly.
diff --git a/Lib/xml/sax/_exceptions.py b/Lib/xml/sax/_exceptions.py
index 1804f3f..88ec8ca 100644
--- a/Lib/xml/sax/_exceptions.py
+++ b/Lib/xml/sax/_exceptions.py
@@ -79,10 +79,11 @@
 
     def __str__(self):
         "Create a string representation of the exception."
-        return "%s at %s:%d:%d" % (self._msg,
-                                   self.getSystemId(),
-                                   self.getLineNumber(),
-                                   self.getColumnNumber())
+        sysid = self.getSystemId()
+        if sysid is None:
+            sysid = "<unknown>"
+        return "%s:%d:%d: %s" % (sysid, self.getLineNumber(),
+                                 self.getColumnNumber(), self._msg)
 
 
 # ===== SAXNOTRECOGNIZEDEXCEPTION =====
diff --git a/Lib/xml/sax/expatreader.py b/Lib/xml/sax/expatreader.py
index 14bc087..1414bb5 100644
--- a/Lib/xml/sax/expatreader.py
+++ b/Lib/xml/sax/expatreader.py
@@ -81,7 +81,8 @@
             self._parser.Parse(data, isFinal)
         except expat.error:
             error_code = self._parser.ErrorCode
-            raise SAXParseException(expat.ErrorString(error_code), None, self)
+            exc = SAXParseException(expat.ErrorString(error_code), None, self)
+            self._err_handler.fatalError(exc)
 
     def close(self):
         if self._entity_stack: