diff --git a/senlin/common/schema.py b/senlin/common/schema.py
index ae97cb7ec..d819aeba5 100644
--- a/senlin/common/schema.py
+++ b/senlin/common/schema.py
@@ -46,10 +46,10 @@ class Schema(collections.Mapping):
 
     KEYS = (
         TYPE, DESCRIPTION, DEFAULT, REQUIRED, SCHEMA, UPDATABLE,
-        CONSTRAINTS,
+        CONSTRAINTS, READONLY,
     ) = (
         'type', 'description', 'default', 'required', 'schema', 'updatable',
-        'constraints',
+        'constraints', 'readonly',
     )
 
     TYPES = (
@@ -60,7 +60,7 @@ class Schema(collections.Mapping):
 
     def __init__(self, description=None, default=None,
                  required=False, schema=None, updatable=False,
-                 constraints=None):
+                 readonly=False, constraints=None):
 
         if schema is not None:
             if type(self) not in (List, Map):
@@ -78,6 +78,7 @@ class Schema(collections.Mapping):
         self.required = required
         self.updatable = updatable
         self.constraints = constraints or []
+        self.readonly = readonly
         self._len = None
 
     def has_default(self):
@@ -135,6 +136,8 @@ class Schema(collections.Mapping):
                 return dict((n, dict(s)) for n, s in self.schema.items())
         elif key == self.REQUIRED:
             return self.required
+        elif key == self.READONLY:
+            return self.readonly
         elif key == self.CONSTRAINTS:
             if self.constraints:
                 return [dict(c) for c in self.constraints]
diff --git a/senlin/tests/engine/test_policy_types.py b/senlin/tests/engine/test_policy_types.py
index 37d6480de..9cf17eb29 100644
--- a/senlin/tests/engine/test_policy_types.py
+++ b/senlin/tests/engine/test_policy_types.py
@@ -42,13 +42,14 @@ class PolicyTypeTest(base.SenlinTestCase):
             'spec': {
                 'KEY1': {
                     'type': 'String',
-                    'required': False,
+                    'readonly': False,
                     'required': False,
                     'description': 'key1',
                     'default': 'default1',
                 },
                 'KEY2': {
                     'type': 'Integer',
+                    'readonly': False,
                     'required': False,
                     'description': 'key2',
                     'default': 1,
diff --git a/senlin/tests/engine/test_profile_types.py b/senlin/tests/engine/test_profile_types.py
index f80ac6e28..d1f7105b7 100644
--- a/senlin/tests/engine/test_profile_types.py
+++ b/senlin/tests/engine/test_profile_types.py
@@ -42,12 +42,14 @@ class ProfileTypeTest(base.SenlinTestCase):
             'spec': {
                 'INT': {
                     'type': 'Integer',
+                    'readonly': False,
                     'required': False,
                     'description': 'int property',
                     'default': 0,
                 },
                 'STR': {
                     'type': 'String',
+                    'readonly': False,
                     'required': False,
                     'description': 'string property',
                     'default': 'a string',
@@ -55,11 +57,13 @@ class ProfileTypeTest(base.SenlinTestCase):
                 'LIST': {
                     'type': 'List',
                     'description': 'list property',
+                    'readonly': False,
                     'required': False,
                     'schema': {
                         '*': {
                             'type': 'String',
                             'description': 'list item',
+                            'readonly': False,
                             'required': False,
                         },
                     },
@@ -68,16 +72,19 @@ class ProfileTypeTest(base.SenlinTestCase):
                 'MAP': {
                     'type': 'Map',
                     'description': 'map property',
+                    'readonly': False,
                     'required': False,
                     'schema': {
                         'KEY1': {
                             'type': 'Integer',
                             'description': 'key1',
+                            'readonly': False,
                             'required': False,
                         },
                         'KEY2': {
                             'type': 'String',
                             'description': 'key2',
+                            'readonly': False,
                             'required': False,
                         },
                     },
diff --git a/senlin/tests/test_common_constraints.py b/senlin/tests/test_common_constraints.py
index 9b9daa9ea..0392d9af8 100644
--- a/senlin/tests/test_common_constraints.py
+++ b/senlin/tests/test_common_constraints.py
@@ -34,6 +34,7 @@ class SchemaTest(testtools.TestCase):
             'type': 'String',
             'description': 'A string',
             'default': 'wibble',
+            'readonly': False,
             'required': True,
             'constraints': [{
                 'constraint': ['foo', 'bar'],
@@ -54,6 +55,7 @@ class SchemaTest(testtools.TestCase):
                     'type': 'String',
                     'description': 'A string',
                     'default': 'wibble',
+                    'readonly': False,
                     'required': True,
                     'constraints': [{
                         'constraint': ['foo', 'bar'],
@@ -61,6 +63,7 @@ class SchemaTest(testtools.TestCase):
                     }]
                 }
             },
+            'readonly': False,
             'required': False,
         }
         c = constraints.AllowedValues(['foo', 'bar'])
@@ -78,6 +81,7 @@ class SchemaTest(testtools.TestCase):
                     'type': 'String',
                     'description': 'A string',
                     'default': 'wibble',
+                    'readonly': False,
                     'required': True,
                     'constraints': [{
                         'type': 'AllowedValues',
@@ -85,6 +89,7 @@ class SchemaTest(testtools.TestCase):
                     }]
                 }
             },
+            'readonly': False,
             'required': False,
         }
         c = constraints.AllowedValues(['foo', 'bar'])
@@ -106,6 +111,7 @@ class SchemaTest(testtools.TestCase):
                             'type': 'String',
                             'description': 'A string',
                             'default': 'wibble',
+                            'readonly': False,
                             'required': True,
                             'constraints': [{
                                 'type': 'AllowedValues',
@@ -113,9 +119,11 @@ class SchemaTest(testtools.TestCase):
                             }]
                         }
                     },
+                    'readonly': False,
                     'required': False,
                 }
             },
+            'readonly': False,
             'required': False,
         }
         c = constraints.AllowedValues(['foo', 'bar'])