Added code that will reveal bugs in calls to namespace().

DT_Util.py

@@ -82,8 +82,8 @@
 # attributions are listed in the accompanying credits file.
 # 
 ##############################################################################
-'''$Id: DT_Util.py,v 1.68 2000/06/29 14:34:19 shane Exp $''' 
-__version__='$Revision: 1.68 $'[11:-2]
+'''$Id: DT_Util.py,v 1.69 2000/07/05 15:52:55 shane Exp $''' 
+__version__='$Revision: 1.69 $'[11:-2]
 
 import regex, string, math, os
 from string import strip, join, atoi, lower, split, find
@@ -256,9 +256,13 @@ def obsolete_attr(self, inst, name, md):
 #    __allow_access_to_unprotected_subobjects__=1
 
 def namespace(self, **kw):
-    """Create a tuple consisting of a single instance whos attributes are
+    """Create a tuple consisting of a single instance whose attributes are
     provided as keyword arguments."""
-    # NOTE: the self argument needs to be a TemplateDict instance.
+    if type(self) != TemplateDict:
+        raise TypeError,'''A call was made to DT_Util.namespace() with an
+        incorrect "self" argument.  It could be caused by a product which
+        is not yet compatible with this version of Zope.  The traceback
+        information may contain more details.'''
     return apply(self, (), kw)
 
 d['namespace']=namespace