import ‘unk’ frame opinions as ‘cer’

importer/Frame.py

@@ -29,6 +29,8 @@ class Frame:
             arguments = {}
             id = frame_tree._attrs['xml:id']
             opinion = frame_tree._children[0]._children[0]._attrs['value']
+            if opinion == 'unk':
+                opinion = 'cer'
             meanings = [meaning._attrs['sameAs'][1:] for meaning in frame_tree._children[1]._children[0]._children]
             for argument_tree in frame_tree._children[2]._children[0]._children:
                 argument = Argument.fromTree(argument_tree)