Halliday & Matthiessen (2004: 376):
This is where what is being linked by a logico-semantic relation is not a single clause but rather a ‘sub-complex’ — a clause nexus in its own right. … We can show nesting in either of two ways.
- (i) The nesting can be represented explicitly as internal braketing — eg 1^ 2 (a ^ b);
- (ii) or it can be represented as a simple string — eg 1 ^ 2a ^ 2b.