def get_composition_lookup_session(self):
        """Gets the OsidSession associated with the composition lookup
        service.

        return: (osid.repository.CompositionLookupSession) - the new
                CompositionLookupSession
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - supports_composition_lookup() is false
        compliance: optional - This method must be implemented if
                    supports_composition_lookup() is true.

        """
        if not self.supports_composition_lookup():
            raise Unimplemented()
        try:
            from . import sessions
        except ImportError:
            raise  # OperationFailed()
        try:
            session = sessions.CompositionLookupSession(proxy=self._proxy,
                                                        runtime=self._runtime)
        except AttributeError:
            raise  # OperationFailed()
        return session
Gets the OsidSession associated with the composition lookup
        service.

        return: (osid.repository.CompositionLookupSession) - the new
                CompositionLookupSession
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - supports_composition_lookup() is false
        compliance: optional - This method must be implemented if
                    supports_composition_lookup() is true.