Halliday & Matthiessen (1999: 62-3):
Qualities characterise things along various parameters, as in green cabbage : red cabbage: see Plate 7.
Again, a number of simple qualities are metaphorical; of the remainder, the "ordinary" qualities, one subtype is qualities of projection and the other is qualities of expansion. (As we will show in subsequent chapters, the categories of projection and expansion are very prevalent in the organisation of the ideation base.)
