diff --git a/editor-python/src/editor/core/DataFormat.py b/editor-python/src/editor/core/DataFormat.py
index d7c8f6e..dca18db 100644
--- a/editor-python/src/editor/core/DataFormat.py
+++ b/editor-python/src/editor/core/DataFormat.py
@@ -17,15 +17,17 @@
 
 from io import FileIO
 
+from .ObjectModel import ObjectModel
+
 class DataFormat:
 
-	def load(self, stream : FileIO):
-		self.load_internal(stream)
+	def load(self, object_model : ObjectModel, stream : FileIO):
+		self.load_internal(object_model, stream)
 
-	def load_internal (self, stream : FileIO):
+	def load_internal (self, object_model : ObjectModel, stream : FileIO):
 		pass
-	def save_internal (self, stream : FileIO):
+	def save_internal (self, object_model : ObjectModel, stream : FileIO):
 		pass
 
-	def save (self, stream : FileIO):
-		self.save_internal(stream)
+	def save (self, object_model : ObjectModel, stream : FileIO):
+		self.save_internal(object_model, stream)
diff --git a/editor-python/src/editor/core/ObjectModelNotSupportedException.py b/editor-python/src/editor/core/ObjectModelNotSupportedException.py
new file mode 100644
index 0000000..c42bbe6
--- /dev/null
+++ b/editor-python/src/editor/core/ObjectModelNotSupportedException.py
@@ -0,0 +1,2 @@
+class ObjectModelNotSupportedException (Exception):
+	pass
\ No newline at end of file
diff --git a/editor-python/src/editor/core/__init__.py b/editor-python/src/editor/core/__init__.py
index ec2f14e..3223e0d 100644
--- a/editor-python/src/editor/core/__init__.py
+++ b/editor-python/src/editor/core/__init__.py
@@ -1,3 +1,4 @@
 from .DataFormat import DataFormat
 from .ObjectModel import ObjectModel
 from .InvalidDataFormatException import InvalidDataFormatException
+from .ObjectModelNotSupportedException import ObjectModelNotSupportedException