use identifiers parsed from input files
diff --git a/of_g.py b/of_g.py
index 87da1c9..6c8144f 100644
--- a/of_g.py
+++ b/of_g.py
@@ -522,3 +522,4 @@
         self.wire_versions = set()
         self.classes = {}
         self.ordered_classes = []
+        self.enums = {}