@abc.abstractmethod<EOL><INDENT>def get_base_types(self, type_):<DEDENT>
return<EOL>
Gets the immediate base types of this type.

        :param type: a type
        :type type: ``osid.type.Type``
        :return: the base types
        :rtype: ``osid.type.TypeList``
        :raise: ``NullArgument`` -- ``type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*