@abc.abstractmethod<EOL><INDENT>def add_base_type(self, type_, base_type):<DEDENT>
pass<EOL>
Adds a base type to a type.

        A base type is a parent of the type where the type implies
        support of the base type.

        :param type: a ``Type``
        :type type: ``osid.type.Type``
        :param base_type: a base type
        :type base_type: ``osid.type.Type``
        :raise: ``NotFound`` -- ``type`` or ``base_type`` is not found
        :raise: ``NullArgument`` -- ``type`` or ``base_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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