Martin (1992: 238):
The point is that "nesting" is a feature of conjunctive relations whether they are expressed through a clause complex structure or not.
Blogger Comment:
In SFL theory, nesting, or internal bracketing, occurs in logical structures whenever there is a change in taxis or in logico-semantic relation (Halliday & Matthiessen 2004: 382). Cohesive conjunction, on the other hand, is a non-structural resource of the textual metafunction.
