Halliday & Matthiessen (2014: 263):
The English system operates with three main types of relation — ‘intensive’, ‘possessive’ and ‘circumstantial’; and each of these comes in two distinct modes of being — ‘attributive’ and ‘identifying’.
Note that the three types of relation are manifestations of the 'fractal types' of expansion and projection:
- intensive: elaboration
- possessive: extension
- circumstantial: enhancement (except matter: projection)