Implement support for schema 2 manifests

data/registry_model/interface.py

@@ -7,6 +7,10 @@ class RegistryDataInterface(object):
       of all tables that store registry-specific information, such as Manifests, Blobs, Images,
       and Labels.
   """
+  @abstractmethod
+  def supports_schema2(self, namespace_name):
+    """ Returns whether the implementation of the data interface supports schema 2 format
+        manifests. """
 
   @abstractmethod
   def find_matching_tag(self, repository_ref, tag_names):