For example, there might be a simple counterclaim on a related, or unrelated, matter; or it might be possible to challenge the validity of the right in some way — for registered rights there are usually well defined ways in which this can be done; however, for unregistered rights the
terrain is often
more uncertain and so
more unusual points will often have to be contemplated, (eg, challenging whether or not the claimant exists as a matter of law, and so has a locus standi to bring the proceedings: this last suggestion might seem farfetched, but it has been used successfully on
more than one occasion).