Martin & Rose (2007: 260):
The formatting of the chapter thus gives us three main units of discourse to work with (although we need to keep in mind that formatting reflects but does not determine discourse structure). Generically speaking, Inauguration Day is a recount, a genre that chronicles an episode of experience, Cost of Courage is a report, a genre for making generalised descriptions, and Meaning of Freedom is an autobiographical recount, a genre for chronicling the significant stages of the author’s life.
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To be clear, here Martin & Rose claim that a text consists of genres (text types). In terms of SFL Theory, this confuses the semantic structure of a text ("units of discourse structure") with a point of variation on the cline of instantiation (text type).
In terms of the authors' own model, it posits categories of a contextual stratum outside language, genre, as structural units of the discourse semantic stratum within language — a stratum which is, moreover, two levels of symbolic abstraction below the genre stratum. The authors' model of stratification is given in Figure 9.2 (p309):
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