1 files changed, 6 insertions, 0 deletions
diff --git a/src-py/model/graph.py b/src-py/model/graph.py
index efc403d4..f197921d 100644
--- a/src-py/model/graph.py
+++ b/src-py/model/graph.py
@@ -59,6 +59,12 @@ class Attr_Diff(dict):
             n_attr_diff = self.init_node_attr_diff(n_id)
         n_attr_diff['__attr_remove'].append(attr_name)
 
+    def add_link_attr_write(self, l_id, attr_name, attr_val):
+        assert False, 'unimplemented'
+
+    def add_link_attr_rm(self, l_id, attr_name):
+        assert False, 'unimplemented'
+
 class Topo_Diff(object):
     """
     Represents a change to the graph topology