@abc.abstractmethod<EOL><INDENT>def remove_base_type(self, type_, base_type):<DEDENT>
pass<EOL>
Removes a base type from a 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 or ``base_type`` is not a base of ``type``
        :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.*