diff --git a/CHANGES.txt b/CHANGES.txt
index 7b82b47..f532369 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -11,6 +11,12 @@ Unreleased
 
 - ``unflatten`` is implemented.
 
+- Added ``__setitem__`` to ``SchemaNode``, allowing replacement of nodes by
+  name.
+
+- Added ``get_value`` and ``set_value`` methods to ``Schema`` which allow
+  access and mutation of appstructs using dotted name paths.
+
 0.9.3 (2011-06-23)
 ------------------
 
diff --git a/colander/__init__.py b/colander/__init__.py
index 247a44c..237caac 100644
--- a/colander/__init__.py
+++ b/colander/__init__.py
@@ -1640,6 +1640,15 @@ class SchemaNode(object):
                 return node
         raise KeyError(name)
 
+    def __setitem__(self, name, newnode):
+        """ Replace a subnode by name """
+        for idx, node in enumerate(self.children[:]):
+            if node.name == name:
+                self.children[idx] = newnode
+                newnode.name = name
+                return node
+        raise KeyError(name)
+
     def __iter__(self):
         """ Iterate over the children nodes of this schema node """
         return iter(self.children)
diff --git a/colander/tests.py b/colander/tests.py
index 444acd6..daf2e6e 100644
--- a/colander/tests.py
+++ b/colander/tests.py
@@ -1935,6 +1935,19 @@ class TestSchemaNode(unittest.TestCase):
         node = self._makeOne(None)
         self.assertRaises(KeyError, node.__delitem__, 'another')
 
+    def test___setitem__success(self):
+        node = self._makeOne(None)
+        another = self._makeOne(None, name='another')
+        node.add(another)
+        andanother = self._makeOne(None, name='andanother')
+        node['another'] = andanother
+        self.assertEqual(node['another'], andanother)
+        self.assertEqual(andanother.name, 'another')
+
+    def test___setitem__failure(self):
+        node = self._makeOne(None)
+        self.assertRaises(KeyError, node.__setitem__, 'another', None)
+
     def test___iter__(self):
         node = self._makeOne(None)
         node.children = ['a', 'b', 'c']