Martin (1992: 389):
As far as realisation across strata is concerned, at clause rank SUBSTITUTION and ELLIPSIS redound with NEGOTIATION while at group rank they redound with IDEATION (cf. Hasan's category of co-classification above).
Blogger Comments:
[1] No realisation statements are provided that specify how these interpersonal and experiential discourse semantic systems are realised in the textual lexicogrammatical system of substitution–&–ellipsis.
[2] The proposal here is that the non-structural textual system of substitution–&–ellipsis in the domain of the clause on the lexicogrammatical stratum "construes and is construed by" the (structural) interpersonal system of negotiation on the discourse semantics stratum. In this grammatical domain, textual wording "construes and is construed by" interpersonal meaning.
[3] The proposal here is that the non-structural textual system of substitution–&–ellipsis in the domain of the group on the lexicogrammatical stratum "construes and is construed by" the (structural) experiential system of ideation on the discourse semantics stratum. In this grammatical domain, textual wording "construes and is construed by" experiential meaning.
[4] Hasan's (1985: 82) category of co-classification refers to the type of cohesive tie in substitution–&–ellipsis (and lexical cohesion). It is irrelevant to claims that substitution–&–ellipsis realises either experiential or interpersonal meanings, according to the grammatical domain of the textual cohesion.