code: def custom_prefix_strict(instance):
      
      for error in chain(custom_object_prefix_strict(instance),
                         custom_property_prefix_strict(instance),
                         custom_observable_object_prefix_strict(instance),
                         custom_object_extension_prefix_strict(instance),
                         custom_observable_properties_prefix_strict(instance)):
          yield error
docs: Ensure custom content follows strict naming style conventions.