It's the fact that in many instances it's quite difficult to describe the physical parameters of the land you're dealing with, and that if it is registered, there often are all kinds of caveats on those lands.
It becomes really complicated in the aboriginal world because of the system of wills that exists, as well. Land that has been passed down through a number of generations gets split up, so that you might end up having, I don't know, 25 to 30 names of people on the title.
There needs to be some system like a Torrens system, whereby you could have a guaranteed title, you would know who actually owns it and what their interests are, and you would have some method of disposing of interests that don't want to be there or aren't necessary to be there. You need that kind of land tenure system.