@abc.abstractmethod<EOL><INDENT>def is_installation_obsolete(self):<DEDENT>
return<EOL>
Tests if the given installation is obsolete.

        :return: ``true`` if the installation is obsolete, ``false`` otherwise
        :rtype: ``boolean``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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