19. The term "acquisition of property on just terms" is a composite term, drawing its meaning from the totality of the words used: Grace Bros v Commonwealth [1946] HCA 11; (1946) 72 CLR 269 at 290. However, it is appropriate to look at the concepts which underlie the overall meaning. Questions of substance of degree, rather than merely of form, are involved: Smith v ANL Ltd at [22], 455 per Gaudron and Gummow JJ. This may be sufficient to overcome any argument that might have been raised, but was not, that s 16 is not a law "with respect to" acquisition of property. It may also be appropriate to acknowledge that the provision in s 51(xxxi) of the Constitution is by way of a positive conferral of a restricted power to make laws with respect to one of several subject matters. On the other hand, the provision in s 28 of the Self Government Act is by way of one of several exclusions from the conferral of an otherwise plenary power to make laws for the peace, order and good government of the Territory. Further, in the case of s 51(xxxi), the exclusion operates on the acquisition of property by any person and is not restricted to acquisition by the Commonwealth or a Commonwealth instrumentality: Smith v ANL Ltd at [27], 457 per Gaudron and Gummow JJ. There appears to be no reason why the same operation ought not apply to s 28, that is to say that it is not restricted to acquisition by the Territory or by a Territory instrumentality.