Halliday & Matthiessen (1999: 286-7):
But let us return to grammatical metaphor that has not become technicalised and retains its character as semantic junction. Here we might want not merely to retain the two phases of representation, that of the metaphorical wording as it stands and that of the congruent wording as it is unpacked, but also to build in some representation of the agnate relationship between them. This can be done with some kind of composite representation as in Figure 6-14. (Such diagrams are considerably more effective if they can be colour-coded).
