diff --git a/Namespaces.py b/Namespaces.py
index 1082397..eb6f5f5 100755
--- a/Namespaces.py
+++ b/Namespaces.py
@@ -77,6 +77,7 @@ class OASIS:
     UTILITY = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
     LIFETIME = "http://docs.oasis-open.org/wsrf/2004/06/wsrf-WS-ResourceLifetime-1.2-draft-01.xsd"
     PROPERTIES = "http://docs.oasis-open.org/wsrf/2004/06/wsrf-WS-ResourceProperties-1.2-draft-01.wsdl"
+    BASENOTIFICATION = "http://docs.oasis-open.org/wsn/2004/06/wsn-WS-BaseNotification-1.2-draft-01.xsd"
 
 class WSSE:
     BASE    = "http://schemas.xmlsoap.org/ws/2002/04/secext"
diff --git a/XMLSchema.py b/XMLSchema.py
index ffc480c..3894791 100755
--- a/XMLSchema.py
+++ b/XMLSchema.py
@@ -671,9 +671,8 @@ class XMLSchemaComponent(XMLBase, MarkerInterface):
             if (a not in (XMLSchemaComponent.xmlns, XMLNS.XML)) and\
                 (a not in self.__class__.attributes.keys()) and not\
                 (self.isAttribute() and self.isReference()):
-                if self.attributes.has_key(a):
-                    raise SchemaError, '%s, unknown namespaced(%s) attribute(s) %s' %(self.getItemTrace(), a,self.attributes[a])
-                raise SchemaError, '%s, unknown attribute %s' %(self.getItemTrace(), a)
+                raise SchemaError, '%s, unknown attribute(%s,%s)' \
+                    %(self.getItemTrace(), a, self.attributes[a])
 
 
 class WSDLToolsAdapter(XMLSchemaComponent):