Define _context_class

lib/python/Products/PageTemplates/TALES.py

@@ -87,7 +87,7 @@
 An implementation of a generic TALES engine
 """
 
-__version__='$Revision: 1.11 $'[11:-2]
+__version__='$Revision: 1.12 $'[11:-2]
 
 import re, sys, ZTUtils
 from MultiMapping import MultiMapping
@@ -226,6 +226,8 @@ class Context:
     use to evaluate compiled expressions.
     '''
 
+    _context_class = SafeMapping
+
     def __init__(self, engine, contexts):
         self._engine = engine
         self.contexts = contexts