diff --git a/ibus/interface/ienginefactory.py b/ibus/interface/ienginefactory.py
new file mode 100644
index 00000000..a89a8c61
--- /dev/null
+++ b/ibus/interface/ienginefactory.py
@@ -0,0 +1,32 @@
+import dbus.service
+from ibus.common import \
+	IBUS_ENGINE_FACTORY_IFACE
+
+class IEngineFactory (dbus.service.Object):
+	# define method decorator.
+	method = lambda **args: \
+		dbus.service.method (dbus_interface = IBUS_ENGINE_FACTORY_IFACE, \
+							 **args)
+
+	# define async method decorator.
+	async_method = lambda **args: \
+		dbus.service.method (dbus_interface = IBUS_ENGINE_FACTORY_IFACE, \
+							 async_callbacks = ("reply_cb", "error_cb"), \
+							 **args)
+	# Return a array. [name, language, icon_path, authors, credits]
+	@method (out_signature = "as")
+	def GetInfo (self): pass
+
+	# Factory should allocate all resources in this method
+	@method ()
+	def Initialize (self): pass
+
+	# Factory should free all allocated resources in this method
+	@method ()
+	def Uninitialize (self): pass
+
+	# Create an input context and return the id of the context.
+	# If failed, it will return "" or None.
+	@method (out_signature = "o")
+	def CreateEngine (self): pass
+
diff --git a/ibus/panel.py b/ibus/panel.py
new file mode 100644
index 00000000..0a31a7eb
--- /dev/null
+++ b/ibus/panel.py
@@ -0,0 +1,12 @@
+class PanelItem:
+	pass
+
+class PanelButton (PanelItem):
+	pass
+
+class PanelToggleButton (PanelButton):
+	pass
+
+class PanelMenu (PanelItem):
+	pass
+