diff --git a/lib/yaml/__init__.py b/lib/yaml/__init__.py
index 82493619..cbc0184a 100644
--- a/lib/yaml/__init__.py
+++ b/lib/yaml/__init__.py
@@ -344,7 +344,17 @@ def add_multi_representer(data_type, multi_representer, Dumper=Dumper):
     """
     Dumper.add_multi_representer(data_type, multi_representer)
 
+def experimental_12_Core_loader():
+    return loader._12_CoreLoader
+def experimental_12_JSON_loader():
+    return loader._12_JSONLoader
+
+def experimental_12_Core_dumper():
+    return dumper._12_CoreDumper
+def experimental_12_JSON_dumper():
+    return dumper._12_JSONDumper
 class YAMLObjectMetaclass(type):
+
     """
     The metaclass for YAMLObject.
     """
diff --git a/lib/yaml/dumper.py b/lib/yaml/dumper.py
index e78e749e..2b148181 100644
--- a/lib/yaml/dumper.py
+++ b/lib/yaml/dumper.py
@@ -83,3 +83,8 @@ def __init__(self, stream,
                 default_flow_style=default_flow_style, sort_keys=sort_keys)
         Resolver.__init__(self)
 
+class _12_CoreDumper(CommonDumper): pass
+_12_CoreDumper.init_tags('core')
+class _12_JSONDumper(CommonDumper): pass
+_12_JSONDumper.init_tags('json')
+
diff --git a/lib/yaml/loader.py b/lib/yaml/loader.py
index 8e2dc6f9..bd18f518 100644
--- a/lib/yaml/loader.py
+++ b/lib/yaml/loader.py
@@ -67,3 +67,9 @@ def __init__(self, stream):
         Composer.__init__(self)
         Constructor.__init__(self)
         Resolver.__init__(self)
+
+class _12_CoreLoader(BaseLoader): pass
+_12_CoreLoader.init_tags('core')
+class _12_JSONLoader(BaseLoader): pass
+_12_JSONLoader.init_tags('json')
+