diff -r 406a41c25e13 -r 0cf10429ad39 server/sources/__init__.py
--- a/server/sources/__init__.py	Mon Feb 07 15:13:05 2011 +0100
+++ b/server/sources/__init__.py	Mon Feb 07 18:19:36 2011 +0100
@@ -1,4 +1,4 @@
-# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This file is part of CubicWeb.
@@ -282,6 +282,21 @@
         """
         pass
 
+    def add_schema_config(self, schemacfg, checkonly=False):
+        """added CWSourceSchemaConfig, modify mapping accordingly"""
+        msg = schemacfg._cw._("this source doesn't use a mapping")
+        raise ValidationError(schemacfg.eid, {None: msg})
+
+    def del_schema_config(self, schemacfg, checkonly=False):
+        """deleted CWSourceSchemaConfig, modify mapping accordingly"""
+        msg = schemacfg._cw._("this source doesn't use a mapping")
+        raise ValidationError(schemacfg.eid, {None: msg})
+
+    def update_schema_config(self, schemacfg, checkonly=False):
+        """updated CWSourceSchemaConfig, modify mapping accordingly"""
+        self.del_schema_config(schemacfg, checkonly)
+        self.add_schema_config(schemacfg, checkonly)
+
     # user authentication api ##################################################
 
     def authenticate(self, session, login, **kwargs):