Add option group support to the document type default metadata types and sets view

apps/metadata/classes.py

@@ -1,5 +1,7 @@
 from django.utils.translation import ugettext_lazy as _
 
+from acls.classes import EncapsulatedObject
+
 
 class MetadataClass(object):
     def __init__(self, dictionary):
@@ -10,3 +12,7 @@ class MetadataClass(object):
             return self.dictionary.get(name)
         else:
             raise AttributeError(_(u'\'metadata\' object has no attribute \'%s\'') % name)
+
+
+class MetadataObjectWrapper(EncapsulatedObject):
+    source_object_name = u'metadata_object'