Fawcett's Difficulty In Understanding The Absence Of 'Insert Unit' In Halliday's Theory

 Fawcett (2010: 183):

It is hard to understand why the Sydney Grammar lists of realisation operations should not give Operation 1 at least the status of being a separate operation from 'preselection'. For a start, this operation will only generate units for the lower layers of a structure, so their realisation operations appear not to have any means of generating the initial unit of the clause. Moreover, even when we limit ourselves to lower units in the structure (such as how a nominal group comes to fill an element such as Subject, we should note that it is perfectly possible for the grammar to need to select a given feature on the next pass through the network without thereby also inserting a new unit, so that preselection must in any case be treated as a separate operation from the insertion of a new unit. 

It is therefore hard to understand why Halliday, Matthiessen and Bateman have no equivalent of Operation 1. The reason may possibly be connected with the fact that the emphasis in the Sydney Grammar is strongly on the generation of clauses. Perhaps this leads those working in that framework to take it for granted that all the choices being made in the system network are for the clause unless the rules state otherwise, so that the insertion of the initial clause does not get stated explicitly. Indeed, one surprising fact about the literature of the Sydney Grammar is that it contains no examples of generations of texts that involve a further layer of structure beyond that of a single clause — even in the fairly full description of the Penman Project given in Matthiessen & Bateman (1991). So there is no account of how the process of re-entry operates in the Sydney Grammar, whether for a clause or even for a simple nominal group. In practice, however, the computer implementation of the Penman model must have some equivalent operation to our Operation 1, or it would be unable to generate structures with more than a single layer (as it does when used in computer implementations). Indeed, the existing realisation operations refer to the generation of lower units (e.g., "Preselect nominal group" in Halliday (1993:4505) — though there are no worked examples.

Blogger Comments:

[1] As previously noted, Fawcett's Operation 1 is 'Insert unit (to fill an element)'. The reason why SFL Theory has no equivalent is simply because a unit is selected from the rank scale within the system.

Each of these units serves as the entry condition to the systems of that unit. It is the rank scale that anchors the systems of the clause — theme, mood and transitivity — on the stratum of lexicogrammar, rather than semantics. Fawcett's Cardiff Grammar locates these grammatical systems at the level of semantics, and does not include a rank scale.

[2] To be clear, in SFL Theory, a nominal group realises the element Subject.

[3] To be clear, in SFL Theory, a unit such as a clause or group is instantiated in a single 'pass' through the simultaneous systems of that unit, so there is no need for re-entry in the instantiation of a single unit. In cases where units form complexes, the network is re-entered through a system of RECURSION, as illustrated for the highest unit, clause, by Halliday & Matthiessen (2014: 438):