@abc.abstractmethod<EOL><INDENT>def register_for_entered_location(self, location_id):<DEDENT>
pass<EOL>
Register for notifications of an entered location.

        ``ResourceLocationReceiver.enteredLocation()`` is invoked when a
        resource appears in the specified location.

        :param location_id: the ``Id`` of the ``Location`` to monitor
        :type location_id: ``osid.id.Id``
        :raise: ``NullArgument`` -- ``location_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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