Martin (1992: 388-9):
The difference between presuming grammatical items and presuming meanings is illustrated in [6:4] and [6:5] below. The lengthy monograph in [6:4bi] does not refer to any particular grammatical unit in [6:4a]; it simply presumes meaning that was there implied:
[6:4] a. It took several months of writing b. i. but in the end the lengthy monograph was complete ii ?? but in the end the lengthy one was complete
Blogger Comment:
This has the reference relation the wrong way around. The reference in this instance is cataphoric, not anaphoric: it refers to the lengthy monograph. In SFL theory, the nominal group the lengthy monograph is not a reference item.
To be clear, reference is a semantic relation between elements, whereas substitution–&-ellipsis is a lexicogrammatical relation (Halliday & Matthiessen 2004: 538, 561-2).