@classmethod<EOL><INDENT>def _get_kind(cls):<DEDENT>
bases = cls._get_hierarchy()<EOL>if not bases:<EOL><INDENT>return model.Model._get_kind.im_func(cls)<EOL><DEDENT>else:<EOL><INDENT>return bases[<NUM_LIT:0>]._class_name()<EOL><DEDENT>
Override.

        Make sure that the kind returned is the root class of the
        polymorphic hierarchy.