diff --git a/wani.py b/wani.py
index 9308fb9..12019cb 100644
--- a/wani.py
+++ b/wani.py
@@ -170,7 +170,7 @@ class ComponentRepresentation:
             else:
                 return {s['selection']: s['value']}
         else:
-            raise NotImplementedError("Representation: {}".format(s))
+            return None
 
 
 class ComponentStatus(Enum):
@@ -348,6 +348,9 @@ class Component:
             for feature in representation:
                 f = ComponentRepresentation.new(dict(feature.attrib))
 
+                if type(f) is None:
+                    print("Unknown representation in component {}, skipping...".format(self.idx), file=sys.stderr)
+                    continue
                 if type(f) is StructureSelection:
                     assert(cr is None)
                     cr = f
@@ -543,7 +546,7 @@ class SyntacticStructure:
         elif el.tag == "representation_and":
             els = list(el)
         else:
-            raise NotImplementedError("repr what?: {}".format(el.tag))
+            raise NotImplementedError("Unknown representation tag: {}".format(el.tag))
         
         for el in els:
             if el.get('basic') == 'form':
@@ -552,7 +555,9 @@ class SyntacticStructure:
             elif el.get('basic') == "agreement":
                 self.add_agreement(n, el)
             else:
-                raise NotImplementedError("representation?: {}".format(el.tag))
+                print("Strange representation (basic={}) in structure {}. Skipping"
+                        .format(el.get('basic'), self.id), file=sys.stderr)
+                continue
 
     def add_agreement(self, n, el):
         assert(el.get('head')[:4] == 'cid_')