diff --git a/typology/README.txt b/typology/README.txt
index 386233f..dc855fe 100644
--- a/typology/README.txt
+++ b/typology/README.txt
@@ -59,6 +59,19 @@ We can now look what the type is telling us about the persons:
   >>> carla_type.token
   'contact.person.agegroup.child'
 
+  >>> carla_type.tokenForSearch
+  'contact.person.agegroup.child'
+  >>> carla_type.qualifiers is None
+  True
+  >>> carla_type.typeInterface is None
+  True
+  >>> carla_type.factory is None
+  True
+  >>> carla_type.defaultContainer is None
+  True
+  >>> carla_type.typeProvider is None
+  True
+
 In this case (and probably a lot of others) types are considered equal
 if they have the same token:
 
diff --git a/typology/interfaces.py b/typology/interfaces.py
index f3897ec..c019aa9 100644
--- a/typology/interfaces.py
+++ b/typology/interfaces.py
@@ -26,6 +26,7 @@ from zope.app.container.interfaces import IContainer
 from zope import schema
 from zope.configuration.fields import GlobalObject
 from zope.interface import Interface, Attribute
+from zope.interface.interfaces import IInterface
 
 
 class IType(Interface):
@@ -49,11 +50,14 @@ class IType(Interface):
                              'types, e.g. for selecting with '
                              'ITypeManager.listTypes()',
                 value_type=schema.ASCIILine())
-    interfaceToProvide = GlobalObject(title=u'Interface to Provide',
-                description=u'An (optional) interface (or schema) that '
-                             'objects of this type will provide')
-    factory = GlobalObject(title=u'Factory',
-                description=u'A factory (or class) that may be used for '
+    typeInterface = schema.Object(IInterface,
+                title=u'Interface to Provide',
+                description=u'An (optional) interface that objects of this '
+                             'type can be adapted to and that provides '
+                             'additional functionality, schema fields, etc')
+    factory = schema.Object(Interface,
+                title=u'Factory',
+                description=u'A factory (or class) that can be used for '
                              'creating an object of this type')
     defaultContainer = schema.Object(IContainer,
                 title=u'Default Container',
diff --git a/typology/type.py b/typology/type.py
index 43fc49c..fe4896f 100644
--- a/typology/type.py
+++ b/typology/type.py
@@ -46,7 +46,7 @@ class BaseType(object):
     def tokenForSearch(self): return self.token
 
     qualifiers = None
-    interfaceToProvide = None
+    typeInterface = None
     factory = None
     defaultContainer = None
     typeProvider = None