diff --git a/gwcs/wcs.py b/gwcs/wcs.py
index b7ccfac3..65c0df94 100644
--- a/gwcs/wcs.py
+++ b/gwcs/wcs.py
@@ -565,7 +565,7 @@ def pixel_bounds(self):
     def world_axis_physical_types(self):
         # Need to match with UCD type
         return self.output_frame.axes_types
-    
+
     def world_axis_units(self):
         return self.output_frame.unit
 
@@ -580,20 +580,32 @@ def world_to_pixel_values(self, *world_arrays):
         # needs **kwargs
         return self.invert(*world_arrays, **kwargs)
 
-    @property
-    def world_axis_object_components(self):
-        components = []
-        outframe = self.output_frame
-        if isinstance(outframe, cf.CompoundFrame):
-            for frame in outframe.frames:
-                components.append(self.output_frame.axes_names[axis])
-        return components
+    def pixel_to_world(self, *pixel_arrays):
+        """
+        Convert pixel values to world coordinates.
+        """
+        pass
+
+    def world_to_pixel(self, *world_objects):
+        """
+        Convert pixel values to world coordinates.
+        """
+        pass
+
+    #@property
+    #def world_axis_object_components(self):
+        #components = []
+        #outframe = self.output_frame
+        #if isinstance(outframe, cf.CompoundFrame):
+            #for frame in outframe.frames:
+                #components.append(self.output_frame.axes_names[axis])
+        #return components
+
+    #@property
+    #def world_axis_object_classes(self):
+        #classes = {}
+        #for axis in self.output_frame.axes_order:
+            #classes[self.output_frame.axes_names[axis]] = ()
+        #return classes
 
-    @property
-    def world_axis_object_classes(self):
-        classes = {}
-        for axis in self.output_frame.axes_order:
-            classes[self.output_frame.axes_names[axis]] = ()
-        return classes
 
-