The Semantic Systems And Structures In Martin (1992)

Matthiessen (1995: 29): 

A text is realised lexicogrammatically by clause complexes, clauses and other grammatical units; but its scope is not determined by the grammar. Semantic systems are thus not confined to semantic units derived from the units of grammar (such as "propositions" or "predications" derived from clauses in formal semantics). This is brought out in Martin's (1992) work on the semantic systems and structures of text.

Blogger Comments:

This is misleading. Martin (1992) rebrands the non-structural textual lexicogrammar of Cohesion In English (Halliday & Hasan 1976) as semantic systems and structures. See the clarifying critiques of Martin (1992) at English Text: System And Structure.