def METHOD_NAME(loader: SchemaLoader, cls: ClassDefinition) -> str:
    """Return code to produce the default namespace for the supplied class"""
    # TODO: figure out how to mark a slot as a namespace
    return "sfx(str(self.id))" if "id" in cls.slots else "None"
    # cls_id = None
    # for slotname in cls.slots:
    #     slot = loader.schema.slots[slotname]
    #     if slot.identifier:
    #         cls_id = slotname
    # return f"sfx(str(self.{cls_id}))" if cls_id else "None"